Troubleshooting | FP2−CCU |
5.2What to Do if an Error Occurs
5.2.3Communication is Inhibited
Situation
There is a possibility that the cables have not been connected correctly.
Solution
If using the unit for the first time, there is a possibility that the cables have been connected incorrectly. Check the connector wiring diagram and check for conductivity, using a tester.
For information on wiring and connections, please check “Chapter 4 RS232C Port Wiring”.
5.2.4If an Error Response is Returned to the Host Side
Situation
There is an error in the format of the command sent from the host side, or the PLC side is unable to process the command.
Solution
Take corrective action based on the error response code.
For information on error codes, please check page 6 − 5.
Tip
If the host side is a display panel, check the following.
−Check to see if communication conditions match between the display panel side and the PLC side, such as the transmission format and transmission speed (baud rate).
−If the device number specified on the display panel side is out of the range of numbers that can be used by the PLC involved in the com- munication, error code 61 (Data Error) may be returned as an error response in some cases.
If the host side is a computer, try the processing again.
−If correct data is received after erroneous data has been received, the ERROR LED goes out.
5 − 6