1:N Communication (Mewtocol Slave Function); Setting Of Unit Numbers; Setting System Registers - Panasonic FP0R User Manual

7.4.5 1:N Communication (MEWTOCOL Slave Function)

A computer and PLCs are connected through a commercially available RS232C-RS485 converter, and
the respective computer and PLCs are wired using an RS485 cable with crossover wiring.
The computer and the PLC communicate via commands and responses: The computer sends a
command specifying the unit number, and the PLC with that unit number sends a response back to the
computer.
Note) LINEEYE CO., LTD SI-35 is recommended to be used as a converter. For the RS232C-type
COM port, a RS232C-RS485 conversion adapter is also required on the PLC side.

Setting of unit numbers

By default, the unit number for each communication port is set to 1 in the system register settings.
There is no need to change this for 1:1 communication, but if 1:N communication is used to connect
multiple PLCs to the transmission line (e.g. in a C-NET), the unit number must be specified so that the
destination of the command can be identified.
The unit number is specified by using the system register.

Setting system registers

No. Name
No. 410 Unit number
No. 412 Communication mode
No. 413 Communication format
No. 415 Baud rate
Note1) The communication format and baud rate should be set to match the connected computer.
Note2) The baud rates of 300, 600 and 1200 bps can be specified by the SYS1 instruction.
For using the RS485 type, make the same setting as that of the baud rate switches (19200 or 115200
bps).
7-14
Note2)
Set Value
1 to 99 (Set the desired unit number)
(With a C-NET adapter, a maximum of 32 units
(stations) can be specified.)
Computer link
Char. bit: ...... 7 bits/8 bits
Parity: ..... None/Odd/Even
Stop bit: ............ 1 bit/2 bit
Terminator: ........ CR
Header: ............ STX not exist
2400 to 115200 bps