Rockwell Automation T3122 ICS Regent Processor Modules - Manual (Page 2)

Processor Modules (T3110, 11, 12, 20, 21, and 22)
2
Industrial Control Services
faults are recorded in the system's fault history. Permanent
faults are also annunciated by an LED on the front of the
processor module. In addition, redundant fault contacts are
activated to signal an external device to alert operators to any
permanent fault.
Module Operation
A block diagram of a typical processor module is shown in
Figure 1.
Inside each processor module is a main processor, an I/O proc-
essor, and a power supply. A battery inside each of the proc-
essor module maintains user application programs and the
downloadable portions of the system's RAMcode if there is a
power failure. Each processor module has interfaces to the
processor Safetybus and the I/O Safetybus. These interfaces
consist of an input voter, discrepancy detector logic, and an
output driver.
Figure 1. Block Diagram of a Processor Module.
The voting and fault detection circuits allow the processor
modules to identify and isolate transient, intermittent, and