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For M238 controller,
Memory area 1 is dedicated to %IW (Input registers) and its limitation is up to 512 words.
Memory area 2 is dedicated to %QW (Output registers) and its limitation is up to 512 words.
So, maximum 512 words of %IW and maximum 512 words of %QW can be used in M238 Modbus IO scanner.
Attempt to use more than 512 words for %IW or 512 words for %QW will result in Build error while performing "BUILD ALL" .