116 Rockwell Automation Publication 1769-UM022C-EN-P - June 2018
Chapter 7 Add, Configure, Monitor, and Replace CIP Safety I/O Devices
Replace a Safety I/O Device
You can use the Logix Designer application to replace a safety I/O device on an
Ethernet network. If you are relying on a portion of the CIP Safety system to
maintain SIL 3 behavior during device replacement and functional testing, the
Configure Always feature cannot be used. Go to Replacement with ‘Configure
Only When No Safety Signature Exists’ Enabled on page 116.
If the entire routable CIP Safety control system is not being relied on to
maintain SIL 3/PLe during the replacement and functional testing of a device,
the Configure Always feature can be used. Go to Replacement with ‘Configure
Always’ Enabled on page 120.
Safety I/O device replacement is configured on the Safety tab of the Compact
GuardLogix controller.
Figure 21 - Safety I/O Device Replacement
Replacement with ‘Configure Only When No Safety Signature
Exists’ Enabled
When a safety I/O device is replaced, the configuration is downloaded from
the safety controller if the DeviceID of the new device matches the original.
The DeviceID is a combination of the node/IP address and the Safety
Network Number (SNN) and is updated whenever the SNN is set.
If the project is configured as ‘Configure Only When No Safety Signature
Exists’, follow the appropriate steps in Tab l e 1 8
to replace a safety I/O device
based on your scenario. Once you have completed the steps correctly, the
DeviceID matches the original, enabling the safety controller to download the
proper device configuration, and re-establish the safety connection.
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