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FX Series PLC User's Manual - Data Communication Edition
Parallel Link
9.
Troubleshooting
This chapter explains troubleshooting.
9.1
Checking FX PLC Version Applicability
Verify that the FX PLC main unit is an applicable version.
9.2
Checking Communication Status Based on LED Indication
Check the status of the "RD" and "SD" indicator LEDs provided in the optional equipment.
LED status
RD
Flashing
Flashing
Off
Off
While the parallel link is executed normally, both LEDs flash brightly.
If they do not flash, check the wiring and the communication setting in the master and slave stations.
9.3
Checking Installation and Wiring
1. Mounting status
If the communication equipment is not securely connected to the PLC, communication is not possible.
For the mounting method, refer to the respective communication equipment manual.
2. Power supply (for FX
The FX
-485ADP requires a driving power supply. Verify that the power supply is correctly provided.
0N
3. Wiring
Verify that the wiring to all communication equipment is correct. If the communication equipment is wired
incorrectly, communication is not possible.
9.4
Checking Sequence Program
1. Communication setting in the sequence program
Verify that N:N Network (D8173 to D8180) is not set. Using both the parallel link and N:N Network at the same
time is not allowed.
Verify that the communication format (D8120, D8400 and D8420) is set correctly. Communication is not
possible if a communication port is set twice or more.
After changing any setting, make sure to cycle power to the PLC.
2. Communication setting using parameters
Verify that the communication settings using parameters are suitable for use. If the communication settings
are not suitable for the purpose of use, communication will not function correctly.
After changing any setting, make sure to reboot the PLC's power.
SD
Flashing
Data is being sent or received.
Off
Data is received, but is not sent.
Flashing
Data is sent, but is not received.
Off
Data is not sent or received.
-485ADP)
0N
9.1 Checking FX PLC Version Applicability
For the version applicability check, refer to Section 1.3.
Operation status
For wiring method check, refer to Chapter 4.
For communication setting, refer to Chapter 5.
For communication setting, refer to Chapter 5.
9 Troubleshooting
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