Rockwell-automation T8160 Trusted TMR Interface Manual de usuario descargar pdf (Pagina 74)

Trusted

TMR Module T8160

Issue 13 May 13 PD-T8160 74

5. Operation

Figure 3 shows the simplified architectural block diagram of a TMR Interface processor sub-system.

Figure 3 Architectural Block Diagram of

Processor Sub-System A

During normal operation, module transition between ‘Active’ and ‘Standby’ modes is under the control

of the Trusted

TMR Processor.

The module scans the I/O sub-system via the I/O Safetybus and exchanges data with the Trusted

TMR Processor. Data from inputs is read from the I/O modules in the I/O assembly. Outputs are

driven by transmitting data through the I/O processor to the I/O assembly. The Trusted

TMR

Interface can communicate with sixteen I/O chassis’, each with up to ten I/O modules.

Communications between the Trusted

TMR Processor and the I/O processor are maintained through

shared RAM; used as a mail box‘ for data transfers between the two.

All three processor sub-systems operate in lock-step synchronisation with each other, continuously

repeating a scan cycle (Figure 4).

Figure 4 Trusted

TMR Processor / Trusted

TMR Interface I/O Processor Scan Cycle

The I/O processors in each sub-system read and write I/O synchronously. During these synchronous

operations, all instructions and data are distributed across the Safetybus where automatic voting and

error detection occur.

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Rockwell-automation T8160 Trusted TMR Interface Manual de usuario Pagina 74