Rockwell Automation Publication 1756-UM013B-EN-P - October 2019 35
Digital Safety I/O Module Operation in a Control System Chapter 1
External Means
Any controller in the system can listen to the data from an I/O module. An
owner-controller, as described in Ownership on page 24
, exchanges data with
I/O modules.
Controllers that do not own a module but must listen to data from it use the
following on the Module Definition dialog box:
• 1756 ControlLogix digital safety I/O modules - Configured By = External
Means.
In this case, the ‘listening’ controller can only listen to input data. The listening
controller does not own the module configuration or exchange other data with
the module.
When the module is configured by External Means, you can disable the module
configuration signature. This disables the configuration validation check when
connections are made.
During the I/O configuration process, you can specify an External Means
connection. For more information on Connection options, see Module
Definition on page 84.
IMPORTANT Remember the following:
• If a controller uses External Means, the connection can be Multicast or
Unicast.
• Once a module has been configured by the owner-controller, External
Means connections can be created and maintained regardless of owner
state.
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