As of October 2018, input module R420 (16 DI) is supplied as a replacement of M400 and M401 (8 DI) and M420 (16 DI) input modules. When replacing the old modules, please consider the new module width of 6 DIN units (rather than 4 DIN units) and 3.5 mm terminals rather than 5 mm terminals. The M420 is of the same width, terminals must be reconnected as well. All 16 inputs have common ground. A new feature is optional addressing over DIP switches, same as at all the R… modules. The Modbus table is backward compatible, so the application software needs not to be changed.
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