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The Inputs and Outputs Are Displaying Incorrect Values in a MicroLogix PLC


Last Update: 11/12/2018

Problem:
When communicating to a Micrologix PLC, the inputs and outputs are displaying incorrect values.

Possible Cause:
Options in the PLC program can add extra I/O words (such as when configuring a MicroLogix 1100's serial CH1 to be a Modbus RTU master). This can shift the locations of the I/O words that correspond to physical I/O.

Solution:
Confirm that the I/O addresses being accessed are correct for the mode of the PLC.

Related Protocols
Allen-Bradley DF1