Troubleshooting - Mitsubishi Electric FX3U-232-BD User Manual

FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)

11. Troubleshooting

This chapter explains troubleshooting and error codes.
11.1 Checking FX PLC Version Applicability
Verify that the FX PLC main unit is an applicable version in non-protocol communication.
11.2 Checking Communication Status Based on LED Indication
Check the status of the "RD" and "SD" indicator LEDs provided in the optional equipment.
RD
Flashing
Flashing
Off
Off
11.3 Checking Installation
1. Mounting status
If the communication equipment is not securely connected to the PLC, communication is not possible.
2. Power supply (for FX
The FX -485ADP requires a driving power supply. Verify that the power supply is provided correctly.
0N
3. Wiring
Verify that the wiring to an communication equipment is correct. If the communication equipment is wired
incorrectly, communication is not possible.
LED status
SD
Flashing
Off
Flashing
Off
For mounting method, refer to the respective communication equipment manual.
-485ADP)
0N
For version applicability, refer to Section 1.3.
Operation status
Data is being sent or received.
Data is received, but is not sent.
Data is sent, but is not received
Data is not sent nor received.
For wiring method check, refer to Chapter 4.
11 Troubleshooting
11.1 Checking FX PLC Version Applicability
F-87
A
B
C
D
E
F
G
H
I
Apx.A