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Safety Considerations for
Safety I/O Devices
You must commission all devices with a node or IP address and communication
rate, if necessary, before their installation on a safety network.
Ownership
One GuardLogix controller owns each Safety I/O device in a GuardLogix
system. Multiple GuardLogix controllers and multiple Safety I/O devices can
be used without restrictions in chassis or on networks, as needed. When a
controller owns an I/O device, it stores the configuration data that you define
for that device. This configuration controls how the devices operate in the
system.
From a control standpoint, one controller controls safety output devices. One
controller also owns each safety input device. However, safety input data can be
shared (consumed) by multiple GuardLogix controllers.
Safety I/O Configuration Signature
IMPORTANT The Safety I/O configuration signatures apply to individual safety modules.
This is different than the controller safety signature, which applies to the
entire safety portion of the controller.
The configuration signature is calculated from the configuration of the Safety
I/O device. The configuration signature is used to verify that the device is
configured as expected by the safety application. When you use a GuardLogix
controller, you do not have to monitor this signature. The GuardLogix
controller automatically monitors the signature. If the configuration signature
changes unexpectedly, the safety connection between the controller and I/O
module is broken which causes the I/O module to enter its safe state.
Rockwell Automation Publication 1756-RM012B-EN-P - April 2018
Safety I/O for the GuardLogix Control System
Chapter 3
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