Rockwell Automation Publication 1756-UM013B-EN-P - October 2019 13
Digital Safety I/O Module Operation in a Control System Chapter 1
The type approval, certification, and suitability levels for 1756-IB16S and
1756-OBV8S modules describe a system with an overall system safety function of
SIL 3. However, you are not required to use 1756 ControlLogix digital safety
I/O modules only in safety applications with an overall system safety function of
SIL 3.
For example, a GuardLogix 5580 controller without a 1756-L8SP safety partner
is suitable for use in safety applications that are rated up to, and including,
SIL CL2, PLd, Cat. 3 as defined in IEC 61508, IEC 61511, IEC 62061, and
ISO 13849-1. You can use 1756-IB16S and 1756-OBV8S modules in such an
application.
GuardLogix 5580 controllers, when used with a 1756-L8SP safety partner are
suitable for use in safety applications that are rated up to, and including SIL 3,
and PLe, cat. 4 as defined in IEC 61508, IEC 61511, IEC 62061, and
ISO 13849-1. You can use 1756-IB16S and 1756-OBV8S modules in such an
application.
For more information on the suitability level of Logix 5000™ safety controllers,
see the GuardLogix 5580 and Compact GuardLogix 5380 Controller Systems
Safety Reference Manual, publication 1756-RM012
.
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