PROFILINK/908
Modicon® S908 Remote I/O
To Profibus DP
Gateway
www.pct-inc.com www.profibus.com
PROFILINK/908
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Tables................................................................................................................................. 1
Table of Figures .............................................................................................................. 1
Table of Tables................................................................................................................ 1
Revision History.................................................................................................................. 2
Acknowledgements............................................................................................................. 3
Introduction........................................................................................................................ 1
Application..................................................................................................................... 1
Features ........................................................................................................................... 1
Table of Acronyms .......................................................................................................... 1
Specifications ...................................................................................................................... 2
Maximum Power Requirements...................................................................................... 2
Dimensions..................................................................................................................... 2
Mounting........................................................................................................................ 2
Overview............................................................................................................................ 3
About PCT....................................................................................................................... 3
Profibus-DP ..................................................................................................................... 3
Modicon® S908 RIO Network ....................................................................................... 4
PROFILINK/908 Functional Overview.......................................................................... 4
Configuration..................................................................................................................... 6
General........................................................................................................................... 6
Configuration Sequence .................................................................................................. 6
PROFILINK/908 Management Slave ............................................................................. 8
General........................................................................................................................ 8
Slave Parameters......................................................................................................... 8
Gateway Type ............................................................................................. 8
Media Redundancy...................................................................................... 8
Report Informational Diagnostics ............................................................... 9
Max Diag Byte Count ................................................................................. 9
PFB Interface Failover Priority................................................................... 9
Failover Priority Threshold ......................................................................... 9
S908 Interface Module................................................................................................ 9
Parameters ................................................................................................... 9
Quantum I/O Slave Module ...................................................................................... 10
Parameters ................................................................................................. 10
Modicon® 800 Series I/O Slave Module.................................................................. 10
Parameters ................................................................................................. 11
System Monitor Module............................................................................................ 11
Input Data.................................................................................................. 11
PROFILINK/908 Quantum I/O Slave........................................................................... 12
General...................................................................................................................... 12
Parameters ................................................................................................................. 12
Drop holdup word ..................................................................................... 12
Supported Quantum Modules.................................................................................... 12
Redundancy Support Module.................................................................................... 13
PROFILINK/908 Modicon® 800 Series I/O Slaves..................................................... 13
PROFILINK/908
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General...................................................................................................................... 13
Parameters ................................................................................................................. 14
Holdup Word............................................................................................. 14
Supported Modules ................................................................................................... 15
PROFILINK/908 Operation.............................................................................................. 17
Startup ........................................................................................................................... 17
Profibus Diagnostics ..................................................................................................... 17
Indicators, Switches and Connectors ............................................................................ 17
Profibus Interface Indicators ..................................................................................... 18
S908 Interface Indicators .......................................................................................... 18
General Indicators..................................................................................................... 19
Setup Switches .......................................................................................................... 19
Connectors................................................................................................................. 20
Typical Installations .......................................................................................................... 21
Non-Redundant ............................................................................................................. 21
Redundant/Simplex Profibus......................................................................................... 22
Redundant/Duplex Profibus .......................................................................................... 23
PROFILINK/908
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Tables
Table of Figures
Figure 1 General PROFILINK/908 Configuration Steps.................................................... 7
Figure 2 PROFILINK/908 Front Panel............................................................................. 17
Figure 3 PROFILINK/908 End Panel............................................................................... 18
Figure 4 Typical Non-redundant Installation.................................................................... 21
Figure 5 Typical Redundant Installation with Simplex Profibus Cabling ........................ 22
Figure 6 Typical Redundant Installation with Duplex Profibus Cabling.......................... 23
Table of Tables
Table 1 Revision History..................................................................................................... 2
Table 2 Acronyms ............................................................................................................... 1
Table 3 Supported Quantum Modules .............................................................................. 13
Table 4 Supported Modicon ® 800 Series Modules ......................................................... 16
Table 5 Profibus Interface Indicators................................................................................ 18
Table 6 S908 Interface Indicators ..................................................................................... 19
PROFILINK/908
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Revision History
1/2005 Initial release
4/2005 Updated support for holdup word emulation
Table 1 Revision History
PROFILINK/908
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Acknowledgements
PCT is not affiliated with Schneider Automation or GSE in any manner.
Modicon® is a trademark of Schneider Automation, Inc.
D/3 DCS® is a trademark of Novatech Process Systems, LLC
PROFILINK/908 ™ 2002 Process Computer Technology, Inc.
GATEWAY 16000 ™ 2002 Process Computer Technology, Inc.
PROFILINK/908
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Introduction
Application
PROFILINK/908 provides a cost effective method of migrating Modicon® Quantum and
800 Series Remote I/O (RIO) onto a Profibus-enabled Distributed Control System (DCS).
The PROFILINK/908 can also be used to add Modicon® S908 RIO to an existing DCS
via Profibus-DP.
The PROFILINK/908 transparently translates the S908 protocol to Profibus-DP by
appearing as multiple Profibus slaves to the DCS controller. By translating the S908
network and protocol to Profibus, all existing Modicon® RIO hardware and associated
field wiring remain intact, resulting in a significant cost and time savings. The
PROFILINK/908 allows hardware installation and transition time to be reduced from
weeks to a matter of hours.
Features
Supports full S908 network of 32 drops.
Modicon® Quantum and 800 Series remote I/O are supported on the same
PROFILINK/908.
Connects to any DCS with Profibus-DP connectivity
The PROFILINK/908 is completely configured via the standard Profibus configuration
utilities supplied with the DCS. No offline configuration of the PROFILINK/908 is
required.
Retains all I/O diagnostic functionality
DIN Rail mounting or optional 19” rack mount
Auto ranging AC or 24 Volt DC input power
Redundancy is supported with single or dual Profibus-DP segments
Table of Acronyms
The following acronyms are used throughout this document:
GSD German acronym roughly translated to Device Specification
PCT Process Computer Technology, Inc.
RIO Remote I/O. In this document, RIO refers specifically to the Modicon®
Quantum and 800 Series hardware and network cabling.
Table 2 Acronyms
PROFILINK/908
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Specifications
Maximum Power Requirements
120 VAC 60HZ 240 VAC 50HZ 24 VDC
0.2 Amps 0.1 Amps 0.78 Amps
Dimensions
The dimensions of the PROFILINK/908 enclosure are 9” (Length) x 5.6” (height) x 5.2”
(depth).
Mounting
The PROFILINK/908 is designed to be DIN Rail mounted An optional chassis is
available to mount the PROFILINK/908 in a standard 19” rack.
PROFILINK/908
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Overview
About PCT
Process Computer Technology (PCT) is an innovative dynamic company serving the
process control industry. PCT has been providing engineered solutions for Industrial
Automation and Process Control for ten years.
The PROFILINK/908, gateway for connecting Modicon® Remote I/O to Profibus
enabled control systems, is the result of a convergence between two PCT core
competencies: PLC systems integration and upgrade hardware development for the D/3
DCS®. Many D/3 DCS® systems have Modicon® Remote I/O utilizing the S908 protocol
as the native I/O in place of the original 16000 I/O.
After successfully developing the GATEWAY 16000 for connecting the D/3 DCS®
16000 I/O to any Profibus enabled control system, PCT hardware and software designers
applied their skills to the Modicon® Remote I/O. The result is the PROFILINK/908,
which is a gateway for the Modicon® I/O S908 protocol, and Profibus enabled control
systems.
PCT was incorporated in 1992 to provide products and services for Factory Automation
and Process Control. We specialize in programmable logic controller (PLC) systems
integration, D/3 DCS® third party hardware upgrades and Profibus solutions for open
control systems.
For more information about PCT’s products and services, refer to the web site at
www.pct-inc.com.
Profibus-DP
Profibus is a defacto industry-standard remote I/O network supported by most major DCS
vendors. Profibus–DP is specifically optimized to support large volumes of high-speed
remote I/O on a single network.
Profibus supports I/O equipment from several vendors in a very structured and
standardized manner. All Profibus device vendors must supply information on the
characteristics of their device via a GSD file. This GSD file (German acronym for
Device Specification) contains information used by the control system to present vendorspecific
configuration options to the user for new equipment in a consistent manner.
Profibus devices are addressed by means of Slave ID (0-125) and offset. Most control
systems present the addressing to the user by means of slave, module, offset or channel.
Each Profibus slave can be configured with up to 244 bytes of input data and up to 244
bytes of output data. Some control systems and configurations may limit the maximum
amount of data a slave can handle.
PROFILINK/908
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Process Computer Technology, Inc (PCT) is a member of the Profibus Trade
Organization (PTO). For more information on Profibus and the PTO, refer to the PTO
web site at www.profibus.com.
Modicon® S908 RIO Network
S908 is a Remote I/O (RIO) network by Schneider Automation, Inc.’s Modicon® unit.
The network and protocol are optimized for the Modicon® RIO hardware and processors.
S908 supports, among others, remote I/O hardware from the Modicon® Quantum and
800 Series. Modicon® Quantum and 800 Series RIO hardware can be mixed on the same
network. Both redundant (dual cable) and non-redundant (single cable) configurations
are supported.
S908 addressing is based upon Drop Number (1-32), Rack Number (1-5), Slot Number
(1-16) and Point Number. The PROFILINK/908 transparently translates between the
Profibus Slave/Module/Channel addressing and the S908 Drop/Rack/Slot/Point
addressing. All module diagnostics are translated to standard or vendor-specific Profibus
diagnostics for presentation via the control system’s diagnostic reporting mechanisms.
Each S908 drop can be configured with up to 128 bytes of input data and up to 128 bytes
of output data.
For more information regarding the S908 network, Quantum RIO hardware or 800 Series
RIO hardware, refer to the Modicon® web site at www.modicon.com.
PROFILINK/908 Functional Overview
The PROFILINK/908 appears as several slaves on the Profibus network. It creates one
Profibus “Management Slave” and multiple Profibus I/O slaves. The Management Slave
is used to configure and control the PROFILINK/908 as a unit. The Profibus I/O slaves
communicate with the Modicon® Quantum or 800 Series RIO hardware.
The PROFILINK/908 Profibus “Management Slave” configures the PROFILINK/908
unit as a whole. By adding and configuring virtual modules into the management slave,
the PROFILINK/908 is directed to create Profibus I/O slaves to map to Modicon®
Quantum and/or 800 Series RIO hardware. This management slave does not correspond
to any physical I/O hardware external to the PROFILINK/908.
The PROFILINK/908 creates multiple I/O slaves, one for each Modicon® Quantum
and/or 800 Series RIO rack. The PROFILINK/908 translates between Profibus
commands and data and Modicon® S908 RIO commands and data. For each RIO rack,
the PROFILINK/908 creates an I/O slave for presenting data to the control system. Each
module in the RIO rack is configured as a module in the Profibus slave on the control
system. Different Profibus slave types are used for Modicon® Quantum and 800 Series
RIO racks. Output data is received from the Profibus network, translated and presented
to the Modicon® S908 RIO network. Input data and status are received from the
Modicon® S908 RIO network, translated and presented to the control system via
PROFILINK/908
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Profibus. This translation is completely transparent to the control system and Modicon®
RIO hardware.
PROFILINK/908
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Configuration
General
All configuration of the PROFILINK/908 and RIO modules is performed via the Profibus
slave configuration utilities supplied by the control system vendor. No additional utilities
are required. This configuration capability is facilitated by device-specific Profibus GSD
files supplied by PCT. These files are loaded in accordance with the control system’s
instructions. Three English language GSD files, corresponding to each Profibus slave
type, are supplied with the PROFILINK/908: PROFILINK/908 Management Slave
(06D6.GSE), PROFILINK/908 Quantum I/O Slave (06D8.GSE) and PROFILINK/908
Modicon® 800 Series I/O Slave (06D9.GSE).
Configuration Sequence
The general steps involved in configuring the control system for use with
PROFILINK/908 are as follows:
Install the GSD files on the control system. This is done in accordance with the control
system’s procedures and varies by system. Note that this step is required to be completed
before any PROFILINK/908 units can be configured. Regardless of the number of
PROFILINK/908 units installed, this step is only performed once for the control system.
Create Management Slave. This Management slave is the central management unit for
each PROFILINK/908 and must be created first. The Profibus slave ID of the
management slave must be set to an unused Profibus address on the segment and must
match the ID set on the thumbwheel switch on the PROFILINK/908 unit shown in Figure
2.
Configure the S908 Interface Module in the Management Slave. This module is required
to be the first module in the Management slave. This module defines parameters that
refer to the S908 RIO network as a whole.
For each RIO rack to be configured create and configure a Slave I/O module into the
Management slave. This module directs the PROFILINK/908 unit to create a Profibus
slave and maps it to the appropriate S908 RIO Hardware.
For each RIO rack to be configured create and configure a Profibus I/O slave of the
corresponding type (Quantum or 800 Series).
Create and configure I/O modules in the Profibus I/O slave.
Repeat steps 0-0 for each RIO rack connected to the PROFILINK/908 unit
Repeat steps 0-0 for each PROFILINK/908 unit to be connected to the control system.
PROFILINK/908
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Install GSD files
on DCS
Create
Management
Slave
Create &
Configure S908
Interface Module
Create &
Configure I/O
Slave Module
Create &
Configure Profibus
I/O Slave
Create and
Configure I/O
Module
More I/O Modules
in Rack?
Yes
More I/O Slaves?
No
Yes
More
PROFILINK.908
units?
No
Yes
No
Figure 1 General PROFILINK/908 Configuration Steps
PROFILINK/908
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PROFILINK/908 Management Slave
General
When initially configuring a PROFILINK/908, the Profibus Management Slave for the
unit is created and configured first in the control system. The address assigned to the
Management Slave in the control system is also set on the thumbwheel switches on the
actual unit. Once the slave is created, an “S908 Interface Module” is configured as the
first module in the Management Slave. For each Quantum RIO rack, an “S908 Quantum
I/O Slave Module” is configured into the Management Slave. For each Modicon® 800
Series RIO rack, an “S908 800 Series I/O Slave Module” is configured into the
Management Slave. A “System Monitoring Module” can optionally be configured into
the Management Slave to retrieve PROFILINK/908 internal statistics.
Slave Parameters
Gateway Type
The Gateway Type parameter specifies whether the PROFILINK is used in a redundant
or non-redundant configuration. Valid values are:
Non-redundant
This value indicates the PROFILINK is in a non-redundant configuration.
Redundant/Fault Tolerant
The PROFILINK is installed in a redundant configuration with 2 PROFILINKs
connected together.
Media Redundancy
The “Media Redundancy” parameter is used to indicate the Profibus cabling used in
redundant configurations. Please see the Typical Installations section for the the various
cabling methodologies. This parameter is only used for redundant PROFILINK
configurations and is ignored in non-redundant configurations.
Single Media
A single Profibus cable is connected to both units in a redundant PROFILINK
configuration. This configuration does not provide redundant Profibus media, but still
provides redundant Proflinks and S908 cabling.
Redundant Media
An independent Profibus cable is connected to each unit in a redundant PROFILINK
configuration. This methodology provides fully redundant Profibus cabling as well as
redundant PROFILINK and S908 cabling.
PROFILINK/908
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Report Informational Diagnostics
The PROFILINK reports several informational diagnostics to aid in configuration and
troubleshooting. Since Profibus does not differentiate the severity level of diagnostics
reported by a slave, all diagnostics are reported as an error. This parameter allows the
PROFILINK to be configured to not report these “informational” diagnostics unless
another error is reported.
Report Always
Selecting this setting causes the PROFILINK to always report informational diagnostics.
On some control systems, this will cause a fault condition to be reported.
Report on Errors Only
Selecting this setting causes the PROFILINK to mask informational
diagnostics unless some other error is reported.
Max Diag Byte Count
Some control systems cannot handle the Profibus-defined maximum of 237 bytes of
diagnostic data. The PROFILINK can be configured to limit the maximum number of
bytes of diagnostic data. This parameter should be left at the default of 237, unless the
control system documentation explicitly states a smaller maximum.
PFB Interface Failover Priority
In redundant configurations, this parameter assigns a point value to the Profibus interface
to be used in calculating relative failover values. If the difference in failover values
exceeds the threshold, the unit will fail to the redundant side. This parameter is ignored
in a non-redundant configuration. This parameter should be left at the default value.
Failover Priority Threshold
When the failover point value difference between the two sides in a redundant
configuration exceeds this threshold, a failover occurs. This parameter is ignored in a
non-redundant configuration. This parameter should be left at the default value.
S908 Interface Module
The “S908 Interface Module” is always the first module configured into the Management
Slave for each PROFILINK/908. This module directs the PROFILINK to configure the
S908 interface for communicating with the S908 RIO network. Any network-wide
parameters are set on this module.
Parameters
Watchdog Timeout Word
PROFILINK/908
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This is the Watchdog Timeout word used by the S908 interface to disable the S908
interface in the event of an internal failure. This parameter should be left at the default
value.
Quantum I/O Slave Module
Each Quantum RIO rack to be scanned by the PROFILINK/908 must have a
corresponding “S908 Quantum I/O Slave Module” configured into the Management
Slave. The parameters to this module determine the mapping between Profibus (Slave
Address) and S908 (Drop Number, Rack Number) addressing. In addition, the fail over
priority is set for the slave. By configuring this module into the Management Slave, the
PROFILINK/908 creates a Profibus slave of the appropriate type and maps it to the
corresponding Quantum RIO hardware.
Parameters
Profibus Slave Address
This parameter instructs the PROFILINK as to the Profibus Station number to associate
with this Quantum I/O slave. This value must match the value used in the host control
system’s configuration for the Quantum drop/Rack.
Failover Priority
Failover point value to be used in calculating failover points in a redundant configuration.
This value is ignored in non-redundant configurations. This value should be left at the
default setting.
Drop Number
S908 Drop number for the physical I/O associated with this slave.
Rack Number
S908 rack number for the physical I/O associated with this slave. Quantum remote I/O
does not currently support more than one rack per drop. This setting should be left at the
default value of 1.
Modicon® 800 Series I/O Slave Module
Each Modicon® 800 Series RIO rack to be scanned by the PROFILINK/908 must have a
corresponding “S908 800 Series I/O Slave Module” configured into the Management
Slave. The parameters to this module determine the mapping between Profibus (Slave
Address) and S908 (Drop Number, Rack Number) addressing. In addition, the fail over
priority is set for the slave. By configuring this module into the Management Slave, the
PROFILINK/908 creates a Profibus slave of the appropriate type and maps it to the
corresponding Modicon® 800 Series RIO hardware.
PROFILINK/908
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Parameters
Profibus Slave Address
This parameter instructs the PROFILINK as to the Profibus Station number to associate
with this 800 Series I/O slave. This value must match the value used in the host control
system’s configuration for the 800 Series drop/rack.
Failover Priority
Failover point value to be used in calculating failover points in a redundant configuration.
This value is ignored in non-redundant configurations. This value should be left at the
default setting.
Drop Number
S908 Drop number for the physical I/O associated with this slave.
Rack Number
S908 rack number for the physical I/O associated with this slave.
System Monitor Module
The System Monitor Module provides a means to retrieve PROFILINK internal system
statistics as Profibus input data. These values are not of any general value to an end user.
This module is documented for informational purposes only and is not supported by PCT.
Input Data
The System Monitor Module provides 30 bytes of input data as described below. All
values and offsets are subject to change without notice.
Byte Type Description
0 byte A Side Reboot Count
1 byte B Side Reboot Count
2 long A Side Uptime (in seconds)
6 long B Side Uptime (in seconds)
10 long A Side Polling Time (in milliseconds)
14 long B Side Polling Time (in milliseconds)
18 long Not used
22 long Not used
26 byte A Side Software Major Version
27 byte A Side Software Minor Version
28 byte B Side Software Major Version
29 byte B Side Software Minor Version
PROFILINK/908
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PROFILINK/908 Quantum I/O Slave
General
Configuring a “S908 Quantum I/O Slave Module” into the Management Slave directs the
PROFILINK/908 to create a Profibus slave and map it to the corresponding Quantum
RIO hardware. The actual Profibus I/O slave must then be created and configured into
the control system. For each Quantum RIO rack, a Profibus Quantum I/O Slave must be
created and configured in the control system. Once the slave has been created, the slave
parameters are set.
Each module in the rack, starting in slot 1, is inserted and configured. Each module’s
configuration parameters are then set. For configuration information and options on
specific modules, consult the Modicon® Quantum documentation.
Parameters
Drop holdup word
The drop holdup time indicates how long the drop should maintain outputs on a
communications failure. If the failure occurs in the S908 communications, the Quantum
drop hardware implements the holdup functionality. In the event of Profibus
communications failure, the PROFILINK simulates the holdup functionality by forcing
all outputs to the appropriate value as configured.
This value is entered in units of 100 milliseconds. An entry of 3 configures the unit with
a holdup time of 300 milliseconds.
Supported Quantum Modules
The list of supported Quantum RIO modules is shown below. Additional module support
may be added in the future. Contact PCT directly for information regarding new module
support or to request support for new modules.
Module Number Function
140-CRA-931-00 Remote I/O Drop Module (Non-redundant applications only)
140-CRA-931-01 Remote I/O Drop Module
140-CRA-932-00 Dual-channel Remote I/O Drop Module
140-DAI-340-00 Discrete 16 Channel Input, AC 24V, 2x8
140-DAI-353-00 Discrete 32 Channel Input, AC 24V, 4x8
140-DAI-440-00 Discrete 16 Channel Input, AC 48V, 2x8
140-DAI-453-00 Discrete 32 Channel Input, AC 48V, 4x8
140-DAI-540-00 Discrete 16 Channel Input, AC 115V, 16x1
140-DAI-543-00 Discrete 16 Channel Input, AC 115V, 2x8
140-DAI-553-00 Discrete 32 Channel Input, AC 115V, 4x8
PROFILINK/908
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Module Number Function
140-DAI-740-00 Discrete 16 Channel Input, AC 230V, 16x1
140-DAO-840-00 Discrete 16 Channel Output, AC 24-230V, 16x1
140-DAO-842-10 Discrete 16 Channel Output, AC 100-230V, 4x4
140-DAO-842-20 Discrete 16 Channel Output, AC 24-48V, 4x4
140-DAM-590-00 Discrete 16 Channel Input, 8 Channel Output, AC 115V
140-DDI-153-10 Discrete 32 Channel Input, DC 5V, 4x8
140-DDI-353-00 Discrete 32 Channel Input, DC 24V, 4x8
140-DDI-841-00 Discrete 16 Channel Input, DC 10-60V, 8x2
140-DDI-853-00 Discrete 32 Channel Input, DC 10-60V, 4x8
140-DDO-153-00 Discrete 32 Channel Output, DC 5V, 4x8
140-DDO-353-00 Discrete 32 Channel Output, DC 24V, 4x8
140-DDO-843-00 Discrete 16 Channel Output, DC 10-60V, 2x8
140-DDM-390-00 Discrete 16 Channel Input, 8 Channel Output, DC 24V
140-DRA-840-00 Discrete 16 Channel Output, Relay Output (NO)
140-DRC-830-00 Discrete 8 Channel Output, Relay Output (NO/NC)
140-ACI-030-00 Analog 8 Channel Input, Unipolar
140-AVI-030-00 Analog 8 Channel Input, Bipolar
140-ACO-020-00 Analog 4 Channel Output, Current
140-AVO-020-00 Analog 4 Channel Output, Voltage
140-ATI-030-00 Analog 8 Channel Thermocouple Input
140-ARI-030-00 Analog 8 Channel RTD Input
140-AMM-090-00 Analog 4 Channel Input, 2 Channel Output
140-CPS-124-xx 8A Redundant Power supply
140-CPS-114-xx 10A Power supply
140-CPS-111-xx 3A Power supply
Table 3 Supported Quantum Modules
Redundancy Support Module
In addition to physical I/O, the redundancy support module can be installed to retrieve
module health information as Profibus input data. If installed, this must be the last
module in the slave.
The Redundancy Support Module returns one bit per module per data path indicating the
module can be accessed. This information is useful in redundant systems to determine
which data path to use in retrieving input data.
PROFILINK/908 Modicon® 800 Series I/O Slaves
General
Configuring a “S908 800 Series I/O Slave Module” into the Management Slave directs
the PROFILINK/908 to create a Profibus slave and map it to the corresponding
PROFILINK/908
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Modicon® 800 Series RIO hardware. The actual Profibus I/O slave must then be created
and configured into the control system. For each Modicon® 800 Series RIO rack, a
Profibus S908 800 Series I/O Slave must be created and configured in the control system.
Once the slave has been created, the slave parameters (Drop Holdup Time) are set. Each
module in the rack, starting in slot 1, is inserted and configured. Each module’s
configuration parameters are then set.
Parameters
Holdup Word
The drop holdup word indicates how long the drop should maintain outputs in the event
of a communications failure. If the failure occurs in the S908 communications, the 800
Series drop hardware implements the holdup functionality. In the event of Profibus
communications failure, the PROFILINK simulates the holdup functionality by forcing
all outputs to zero after the holdup time has expired.
NOTE: All racks on the same drop should have this value set to the
same value. If the Holdup Word is set differently for each rack on the
same drop, the results are unpredictable.
This value is entered in units of 100 milliseconds. An entry of 3 configures the unit with
a holdup time of 300 milliseconds.
PROFILINK/908
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Supported Modules
Module Number Function
B802 8 Channel Discrete Output
B803 8 Channel Discrete Input Module
B804 16 Channel Discrete Output Module
B805 16 Channel Discrete Input Module
B806 32 Channel Discrete Output Module
B807 32 Channel Discrete Input Module
B808 16 Channel Discrete Output Module
B809 16 Channel Discrete Input Module
B810 8 Channel Discrete Output Module
B814 8 Channel Discrete Output Module
B816 16 Channel Discrete Output Module
B817 16 Channel Discrete Input Module
B818 32 Channel Discrete Output Module
B819 32 Channel Discrete Input Module
B820 8 Channel Discrete Output Module
B821 8 Channel Discrete Input Module
B824 16 Channel Discrete Output Module
B825 16 Channel Discrete Input Module
B826 32 Channel Discrete Output Module
B827 32 Channel Discrete Input Module
B828 16 Channel Discrete Output Module
B829 16Channel Discrete Input Module
B832 16 Channel Discrete Output Module
B833 16 Channel Discrete Input Module
B834 8 Channel Discrete Output Module
B835 8 Channel Discrete Input Module
B836 16 Channel Discrete Output Module
B837 16 Channel Discrete Input Module
B838 32 Channel Discrete Output Module
B840 8 Channel Discrete Output Module
B842 8 Channel Discrete Output Module
B846 16 Register I/O Module
B849 16 Channel Discrete Input Module
B853 16 Channel Discrete Input Module
B855 16 Channel Discrete Input Module
B872 4 Channel Analog Output Module
B873 4 Channel Analog Input Module
B875 8 Channel Analog Input Module
B877 6 Channel Analog Input Module
B881 1 Input, 1 Output Register I/O Module
PROFILINK/908
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Module Number Function
B882 2 Input, 2 Output Register I/O Module
B883 3 Input, 3 Output Register I/O Module
B884 4 Input, 4 Output Register I/O Module
B885 6 Input, 6 Output Register I/O Module
B886 8 Input, 8 Output Register I/O Module
B887 12 Input, 12 Output Register I/O Module
B888 16 Input, 16 Output Register I/O Module
B883-200 10-channel Thermocouple input module. This module is currently
supported only as an 883 Register I/O Module.
P810 Power Supply Module
J890 S908 RIO communication Module
Table 4 Supported Modicon ® 800 Series Modules
PROFILINK/908
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PROFILINK/908 Operation
Startup
During startup, the PROFILINK/908 performs the following:
The PROFILINK/908 unit performs self tests on the CPU, RAM, Profibus interface and
S908 interface. If any of these self-tests fail, the unit will not go online.
The S908 RIO configuration and mappings to Profibus are downloaded from the control
system via Profibus. This step eliminates all off-line configuration for the
PROFILINK/908.
Once the complete configuration is downloaded, the PROFILINK/908 starts Profibus
communications with the host. The PROFILINK/908 will not start scanning the RIO
hardware until good output data has been received and verified. During this state, the
PROFILINK/908 will communicate with the RIO network in “standby” mode to ensure
network integrity.
Once all output data has been received, the PROFILINK/908 starts normal scanning.
Profibus Diagnostics
All S908 module diagnostics are either handled internally by the PROFILINK/908 or are
translated into standard or vendor-specific Profibus diagnostics for presentation to the use
via the standard control system mechanisms. Diagnostic capabilities vary by family and
module type within the family. For more information on diagnostics for a particular
module, refer to the documentation supplied with the module.
Indicators, Switches and Connectors
Figure 2 PROFILINK/908 Front Panel
PROFILINK/908
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Figure 3 PROFILINK/908 End Panel
Profibus Interface Indicators
The two indicator LEDs below the Profibus connector are indicators for the Profibus
interface status. The meanings of the indicators shown in Figure 3 are as follows:
Upper
LED
Lower
LED Description
Green Green Normal operation, communicating with host for all slaves.
Orange Green Normal internal operation. Not communicating with Host(s) on
one or more slaves. This is also normal operation for standby unit
in single Profibus cabling configuration.
Red Off The PROFILINK/908 unit is starting.
Green/Red
Flickering
Off The PROFILINK/908 unit is initializing and synchronizing with
the host.
Table 5 Profibus Interface Indicators
S908 Interface Indicators
The two indicator LEDs below the S908 network connector are indicators for the S908
interface status. The meanings of the indicators shown in Figure 3 are as follows:
PROFILINK/908
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Standby
LED
Remote I/O
Activity LED
Description
Off Off The PROFILINK/908 is starting or has failed.
Green Off The PROFILINK/908 is initializing configuration
information. No scanning of I/O is taking place.
Green Red
(Dim/Flickering)
The PROFILINK/908 unit is operating in Standby
mode. This indication is also given when unit has
initially configured and is performing consistency
checks before scanning I/O.
Off Red
(Dim/Flickering)
The PROFILINK/908 unit is functioning normally in
Primary mode.
Table 6 S908 Interface Indicators
General Indicators
The general indicators shown in Figure 2 are as follows:
A Side: In redundant configurations, this indicator illuminates to indicate the “A” side
communications gateway. For non-redundant, this indicator is always lit.
Primary: In redundant configurations, this indicator illuminates to indicate the unit that is
scanning the S908 RIO in “Primary” mode, i.e. is performing inputs and outputs.
Run: When illuminated, indicates the unit is in running mode.
Setup Switches
Gateway ID: This thumbwheel switch (Fig. 2) sets the Profibus Slave ID for the
Management slave for the PROFILINK/908 unit. In redundant configurations, both parts
of the redundant unit must be set to the same ID.
S1 and S2 (Fig. 3) select the Profibus Baud Rate:
Baud Rate S1 S2 (Left = Off)
500KB On On
1.5MB Off On
6MB On Off
12MB Off Off
S3 (Fig.3) Simplex/Duplex Profibus: Off = Simplex On = Duplex. Simplex indicates a
single Profibus cable is connected to both sides. In duplex mode, a separate Profibus
cable is connected to each side and to different Profibus Master interfaces in the control
system host.
PRI SELECT/AUTO/PRI LOCK Switch (Fig. 2): This switch has no effect in nonredundant
PROFILINK/908.
AUTO (Center Position): Will allow automatic “failover” from Primary unit to Backup
unit, if Backup unit is running, if a watchdog timeout or a loss of power occurs in the
Primary unit.
PROFILINK/908
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PRI SELECT (Momentary): Causes unit to become Primary and scan I/O if unit is
running.
PRI LOCK: Forces unit to be Primary, if unit is running, and “locks out” Standby unit
from becoming Primary.
Connectors
Refer to Figure 3 for location of the connectors described below.
Profibus Cable: The Profibus cable from the control system host connects to this
connector. For redundant Simplex installations, a single Profibus cable connects to both
sides of the PROFILINK/908 and to a single Profibus interface in the control system. For
redundant Duplex configurations, each side of the PROFILINK/908 is connected to a
separate Profibus cable to separate Profibus interfaces in the control system host. Care
must be taken to ensure that the “A” side Profibus cable is connected to the “A” side
PROFILINK/908 and to the “A” side S908 RIO cable. Refer to Figure 4, Figure 5 and
Figure 6 for typical cabling and installation options.
S908 Cable: The S908 RIO cable connects to this connector and to the drop modules in
each Quantum and 800 Series drop.
Redundancy Link: For redundant configurations, the redundancy interlink cable connects
both sides of the PROFILINK/908 together. Care should be taken to ensure that the “A”
side of the redundancy interlink cable is connected to the “A” side PROFILINK/908. For
non-redundant configurations, the Redundancy terminator is placed on this connector
instead.
IPC Link: The interprocessor communication link connects both sides of the
PROFILINK/908 together. Status and data is communicated to both sides via this cable.
PROFILINK/908
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Typical Installations
Non-Redundant
DCS
Controller
P
F
B
PROFILINK.908
Quantum Drop
800 Series
Drop
Profibus
S908
800 Series
Rack
800 Series
Rack
Figure 4 Typical Non-redundant Installation
PROFILINK/908
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Redundant/Simplex Profibus
S908 B Side
DCS
Controller
P
F
B
PROFILINK.908
A Side
Quantum Drop
800 Series
Drop
Profibus
S908 A Side
800 Series
Rack
800 Series
Rack
PROFILINK.908
B Side
Figure 5 Typical Redundant Installation with Simplex Profibus Cabling
PROFILINK/908
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