Rockwell Automation CS300 Trusted CS300 Bridge Module - Manual (Page 7)

Trusted
TM
CS300 Bridge Module
Issue 01 Apr 08 PD-8162 7
1. Description
1.1. Overview
The CS300 Bridge Module enables connection between a CS300 I/O sub system and the Trusted TM
TMR Processor. Three CS300 Bridge modules replace the three ICCB modules in a CS300 primary
chassis.
The Bridge module has a fast serial ("Hotlink") interface that transfers command and response packets
between the two product families via the Trusted
TM Expander Bus. The module uses a Field
Programmable Gate Array (FPGA) for decoding instructions from the Trusted TM TMR processor,
accessing the specified CS300 I/O module and returning any data requested.
Command data received by the three Bridge modules and responses to the Trusted
TM TMR Processor
are synchronised in accordance with the Lock Step operational characteristics of the Trusted TM
Expander Bus. For this reason, the three bridge modules share their data and arrange their response
packets in the same order for simultaneous transmission. The clock signal received from the Expander
Bus is used to ensure that data from all three Bridge modules is transmitted on the same clock edge.
The Trusted
TM TMR processor stores and executes the application program, scans and updates the
CS300 I/O modules and detects system faults. Each of the three slices of the TMR Processor
executes the application program independently, but in lock-step synchronisation with the other two.
All CS300 I/O actions are executed by polling only. This means that all CS300 I/O modules are
supported, with the exception of Serial I/O modules (which generate interrupts). All communications to
workstations and DCS systems are enabled through the Trusted
TM Communications Interfaces.
FCR A
FCR A
Trusted
Expander
Interface
Module
hotlink
receiver FPGA
(C)
(B)
Bridge Module (A)
Bridge Module (B)
Bridge Module (C)
hotlink
transmitter
CS300
Backplane
Expansion Bus (TC-322-02 Cable)
(TC-324-02 Board)
Inter Module
Link
(A)
Trusted™
Main Chassis
CS300
Main Chassis
to CS300 I/O
Modules
Figure 1 Block Diagram showing interface between Trusted TM system and CS300 I/O