Delta VFD300C43S-HS User Manual page 744

Chapter 16 PLC Function ApplicationsC2000-HS
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Will trigger M0 On when the PLC begins to operate, and sends instruction to
execute one MODRW command.
After receiving the slave device's response, if the command is correct, it will
execute one ROL command, which will cause M1 to be On.
After receiving the slave device's response, will trigger M50 = 1 after a delay of 10
PLC scanning cycles, and then execute one MODRW command.
After again receiving the slave device's response, if the command is correct, it will
execute one ROL command, and M2 will change to On at this time (and M2 can
be defined as a repeat of M); K4M0 will change to K1, and only M0 will remain 1.
Transmission can proceed in a continuous cycle. If you wish to add a command,
merely add the desired command in the empty frame, and change repeat M to
Mn+1.
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