Owner's manual

Chapter 6 PLC Link
116
6
6.4 PLC Link Error
When a communication error occurs during PLC link, communication stops and the
N-400 displays the following code:
When this error occurs with the PLC link, check the following points:
1. Check if the RS-232C communication parameters (baud rate, data length, parity
and stop bit) for the PLC are matched with the N400’s settings.
2. Check if the N-400’s communication mode is set to “KV”, “MELSEC” or
“SYSMAC”.
3. Check if the PLC’s settings are correct. (See pp. 106 and 107.)
4. Check if the cable connections are correct, or if any cable is disconnected.
Referring to pp. 14 to 16 of this manual, check the connections using a
multimeter.
5. Check if the device setting range does not exceed the available data memory
areas of the PLC.
If the data memory areas used for the N-400 do not exist in the PLC, communi-
cation is impossible.
6. Check if the link unit operates normally.
To re-start the PLC link, press the test switch.
For the settings of the link unit, see the instruction manual for the link unit being
used.
or