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How do you send an ASCII string out from a Schneider (Modicon) M340 or M580 with ModbusTCP/IP?

Published date: 15 July 2019

Product Line:
M340, M580, X80

Ecostruxure Control Expert

Unfortunately you can not;
The M340 and M580 ethernet ports can only send or receive Modbus TCP/IP or Ethernet/IP messaging. They cannot read or write in ASCII characters using these protocols.  
The only option is to use the M340 Modbus serial port or BMX NOM 0200 module with the INPUT_CHAR or the PRINT_CHAR function blocks to read and write an ASCII string to or from a slave device.

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