Allen-Bradley Rockwell Automation 1734-AENT Manual de usuario descargar pdf (Pagina 43)

Publication 1756-RM093F-EN-P - January 2010 43

Characteristics of Safety Tags, the Safety Task, and Safety Programs Chapter 5

Safety-locking the safety task once testing is completed is

recommended for SIL 2 applications. Locking the safety task enables

additional security features. You may also use FactoryTalk Security

and RSLogix 5000 routine source protection to limit access to

safety-related logic.

For more information on generating a safety task signature and

safety-locking the safety task, refer to the GuardLogix Controllers User

Manual, publication 1756-UM020

, or the Compact GuardLogix

Controllers User Manual, publication 1768-UM002

SIL 2 Safety Inputs

CompactBlock Guard I/O (1791-series) and ArmorBlock Guard I/O

(1732-series) safety input modules support single-channel SIL 2 safety

input circuits. Since these modules are also rated for SIL 3 operation,

mixing SIL 2 and SIL 3 circuits on the same module is allowed,

provided you follow these guidelines.

These two wiring examples show how to wire SIL 2 safety circuits to

Guard I/O safety input modules. These examples make use of

onboard test sources (T0…Tx) that are resident on all 1791 and 1732

safety input modules.

Input Wiring

Guard I/O modules group inputs in pairs to facilitate Cat 3, Cat 4, and

SIL 3 safety functions. For use in Cat 1, Cat 2, and SIL 2 safety

functions, module inputs should still be used in pairs as illustrated.

Two SIL 2 safety functions are shown wired to inputs I0 and I1 using

test sources T0 and T1, respectively.

Input Wiring in Pairs

I0 I1 T0 T1

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 113 114

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Allen-Bradley Rockwell Automation 1734-AENT Manual de usuario Pagina 43