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What are the function codes of the Modbus protocol used by IO Scanning in TCP-IP for a M241/M251 controller?
The following Modbus protocol function codes are used by IO Scanning on Modbus TCP-IP over Ethernet :
  • Read only   = function code 03
  • Write only   = function code 16
  • Read/write  = function code 23

Released for: Schneider Electric Ireland
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Modicon M241
Modicon M251
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