Rockwell-automation T8110B/T8110 Trusted TMR Processor Manual de usuario descargar pdf (Pagina 33)

Trusted

TMR Processor T8110B/T8110

Issue 18 Feb 08 PD-T8110B/T8110 33

4.8.5. Example Calculation

As an example, consider a simple Trusted

system with the following configuration:

Part No. Description Qty. Type

T8110B Trusted

TMR Processor 1 N/A

T8151B Trusted

Communication 2 N/A

T8403 Trusted

TMR 24Vdc Digital Input 4 Input

T8431 Trusted

TMR Analogue Input 1 Input

T8451 Trusted

TMR 24Vdc Digital Output 2 Output

This is a relatively small system with 280 I/O points and 2 communication modules.

Scan Factor No. Input Modules Input Total

4.5 ms x 5 22.5

Scan Factor No. Output Modules Output Total

7 ms x 2 14

No. I/O Modules Application Execution Total

( 7 ) x 0.3 ms 2.1

No. I/O Modules No. Comms

Modules

Communications Total

( 7 ) x 1.5 ms x ( 2

)

Input Module Total

22.5 ms

Output Module Total

14 ms

Application Execution Total

2.1 ms

Communications Total

21 ms

Composite Scan Time 59.7 ms

This assumes all modules are polled every scan, all outputs are written every scan and

communications is moderate to heavy. The time may be shortened using scheduled polling, write by

exception and rationalised communications. Note that the application execution time is insignificant.

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Rockwell-automation T8110B/T8110 Trusted TMR Processor Manual de usuario Pagina 33