The communication mode and other communication parameters are set in the PLC's system registers.
Each communication mode requires different settings.
Parameter |
Program controlled communication |
Master/slave communication (MEWTOCOL-COM/Modbus-RTU) |
“PLC link” |
Station number |
– |
l |
l |
Baud rate1) |
l |
l |
Fixed |
Data length, stop bit, parity, end code, start code 1) |
l |
l2) |
Fixed |
Receive buffer (CPU only) |
l |
– |
– |
Link area |
– |
– |
l |
1) The setting must match the external device connected to the communication port.
2) The end code setting must always be "CR", and the start code setting must be "No STX".
Use the programming tool or DIP switches on the PLC to make your settings in PROG mode. Or use F instructions to change parameters in RUN mode.
Select the appropriate setting method for your CPU or Multi-Communication Unit:
Parameter |
PROG mode |
RUN mode |
CPU |
MCU |
|---|---|---|---|---|
Communication mode |
System registers |
– |
l |
l |
– |
SetCommunicationMode |
l |
l |
|
– |
F159_MTRN (n_Number=16#8000) |
l |
l |
|
Other parameters (e.g. baud rate, station number, start and end code, receive buffer) |
System registers or DIP switches |
– |
l |
|
– |
SYS1, SYS2 |
l |
||
MCU dialog or DIP switches |
– |
l |
||
– |
F159_MWRT_PARA |
l |
Communication parameter instructions
DIP switch settings of Multi-Communication Unit
SYS1 Communication condition setting for the COM ports of the CPU
FP-X0, Multi-Communication Unit: Please refer to the corresponding manual that you can find in the download center in the Internet.