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Do I need to change my PLC program if I switch from using Advantage starters on DeviceNet (WPONIDNA) to either C440 or C441 overloads?

No. The DeviceNet interface modules for the C440 OL (C441KS or C441LS) and the C441 Motor Insight OL (C441K or C441L) contain I/O assemblies for the Advantage/WPONIDNA. These I/O assemblies contain the same I/O layouts as the I/O assemblies for the WPONIDNA, so the PLC program can remain the same while upgrading the old Advantage starters to one of the newer overloads on DeviceNet.