Rockwell-automation T71xx Regent+Plus Processor Modules 110 VAC, 220/2 User Manual download pdf (Page 2)

Processor Modules (T7110, 11, 12, 20, 21, and 22)

2 (Issue 1) Industrial Control Services

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

Inside each processor module is a main processor, an I/O proc-

essor, and a power supply. A battery inside each of the processor

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 permanent faults

as they occur. All faults are recorded in the system's fault history.

Each processor module contains its own power supply that

converts input power to the logic power levels used by the internal

processor circuits. The failure of one power supply will only effect

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Rockwell-automation T71xx Regent+Plus Processor Modules 110 VAC, 220/2 User Manual Page 2