Rockwell Automation Publication 1756-RM012B-EN-P - April 2018 25
Safety I/O for the GuardLogix Control System Chapter 3
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
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.
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.
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