G-41
FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (FX2N-232IF)
7 Troubleshooting
7.1 Check Items
A
Common Items
B
N:N Network
C
Parallel Link
D
Computer Link
E
Inverter
Communication
F
Non-Protocol
Communication
(RS/RS2 Instruction)
G
Non-Protocol
Communication
(FX
2N
-232IF)
H
Programming
Communication
I
Remote
Maintenance
Apx.
Discontinued
models
7. Troubleshooting
7.1 Check Items
1) Check the POWER LED of the 232IF.
- While the POWER LED is ON, the drive power is being supplied normally.
- If the POWER LED is OFF, the drive power is not being supplied normally.
2) Verify that the power supply is correctly wired to terminals of the 232IF.
3) Check the SD LED and RD LED of the 232IF.
- If the RD LED does not turn ON when the 232IF receives data or if the SD LED does not turn ON when
the 232IF sends data, check the connection and wiring.
- If the RD LED turns ON when the 232IF receives data or if the SD LED turn ON when the 232IF sends
data, the installation and wiring are normal.
4) Verify that the communication setting (BFM #0) in the 232IF is aligned correctly with the communication
setting in the external equipment. If the communication setting is not aligned correctly, align it.
5) Check the timing at which data is sent and received. For example, when sending data, verify that the
external equipment is ready to receive.
6) When the terminator is not used, verify that the quantity of data to be sent matches the receivable data
quantity. If the quantity of send data may vary, use the terminator.
7) Verify that the external equipment is operating normally.
8) Verify that the adopted data format is uniform. If the data format is different, modify it.
7.2 Error Codes
When an error occurs while data is being sent or received, the 232IF sets bit 3 of the BFM #28 to ON,
and stores the corresponding error code to the BFM #29
.
Code Contents Cause and countermeasures
0 No error —
1
Receiving parity error, overrun
error or framing error
The communication format such as the baud rate does not agree.
The control timing does not agree.
2 Undefined —
3 Defective received character The received data is not ASCII code.
4 Receiving sum check error The sent sum does not agree with the received sum result (BFM #16).
5
Receive data buffer overflow
(only in interlink connection
mode)
The number of received bytes exceeds "512+30" bytes. Decrease the
maximum number of receivable bytes (BFM #2), and increase the pre-
liminary receive data buffer area.
6 Baud rate setting error Non-existing baud rate is specified.
7 Receiving CR error CR is not located in the specified position.
8 Receiving LF error LF is not located in the specified position.
9
Head sending/receiving
terminator setting error
The head terminator is something other than 01H to 1FH.
10 Receiving terminator error
The terminator is not located in the specified position. Or the terminator
does not agree.
11 Undefined —
12 Transmission order error The transmission order does not agree.
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