Allen-Bradley AADvance T9110, Руководство по безопасности

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46 Rockwell Automation Publication ICSTT-RM446N-EN-P - April 2018
Chapter 3 AADvance System Architectures
Table 4 - Modules for SIL 2 Fail-Safe Architecture
Fault Tolerant Input Architectures
A SIL 2 fault tolerant input architecture can have dual or triple input modules
with a single processor and single output modules. The illustration shows a
dual input arrangement where the dual input modules operate in 1oo2D under
no fault conditions, they degrade to 1oo1D on detection of the first fault in
either module of the redundant pair, and when a fault occurs on the second
module it will fail-safe.
The processor module operates in 1oo1D under no fault conditions and
degrades to fail safe on the first detected fault. The output module operates in
1oo1D under no fault conditions and will fail-safe on the first detected fault.
When a triple input module arrangement is configured the group of input
modules operate in 2oo3D under no fault conditions, degrade to 1oo2D on
the detection of first fault in any module, then degrade to 1oo1D on the
detection of faults in any two modules, and will fail-safe when there are faults
on all three modules.
Position Module Type
I/P A T9401/2 Digital Input Module, 24V dc, 8/16 Channel
+ T9801 Digital Input TA, 16 Channel, Simplex.
or
T9431/2 Analogue Input Module, 8/16 Channel
+ T9831 Analogue Input TA, 16 Channel, Simplex
T9300 I/O Base Unit
CPU A 1 x T9110 Processor Module, T9100 Processor Base Unit,
O/P A T9451 Digital Output Module, 24V dc, 8 Channel, is T9851 Digital Output TA, 24V dc 8
Channel, Simplex
1 x T9481/T9842 Analogue Output Module, 3/8 Ch, Is T9881 Analogue Output TA, 8 Ch,
Simplex
NOTE Simplex processors can only be used for low demand applications. Simplex
output modules used for energize to action applications can only be used for
low demand applications.