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

Unfortunately you can not..
The M340 ethernet ports can only send or receive Modbus TCP/IP messaging. They cannot read or write in ASCII characters mode.  The only option is to use the M340 Modbus serial port 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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