Rockwell Automation SC300E Trusted Bridge Module - Manual (Page 7)

Trusted™ Bridge Module 8161
Issue 2 Feb 10 PD-8161 7
1. Description
1.1 Overview
The SC300E Bridge enables connection between a Triguard SC300E I/O sub system and the
Trusted™ TMR Processor. Three SC300E Bridge modules replace the three MPP modules in a
Triguard 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™ Expander Bus. The module uses a Field
Programmable Gate Array (FPGA) for decoding instructions from the Trusted™ TMR processor,
accessing the specified Triguard I/O module and returning any data requested.
Command data received by the three Bridge modules and responses to the Trusted™ TMR Processor
are synchronised in accordance with the Lock Step operational characteristics of the Trusted™
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™ TMR processor stores and executes the application program, scans and updates the
Triguard 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 Triguard I/O modules are supported. Triguard Serial Communication modules are not supported. All
communications to workstations and DCS systems are enabled through the Trusted™
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
Triguard
Backplane
Expansion Bus (TC-322-02 Cable)
(TC-325-02 Board)
Inter Module
Link
(A)
Trusted™
Main Chassis
Triguard
Main Chassis
to Triguard
I/O Modules
Figure 1 Block Diagram showing interface between Trusted™ system and Triguard I/O