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In a multi-CPU system, I set the 'Output reference input' of the I/O group registration but the variable (contact) specified for the output reference input does not turn on. Why?

In a multi-CPU system, I set the 'Output reference input' of the I/O group registration but the variable (contact) specified for the output reference input does not turn on. Why?
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Answer

To enable the 'output value reference input,' the output module must be actually mounted. If the output module is set as 'unimplemented' in the system configuration definitions, the variable is not turned on on the input side.