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FX Series PLC User's Manual - Data Communication Edition
N:N Network
9 Troubleshooting
9.1 Checking FX PLC Version Applicability
9. Troubleshooting
This chapter explains troubleshooting.
9.1 Checking FX PLC Version Applicability
Verify that the FX Series PLC main unit is an applicable version.
→ For the version applicability check, refer to Section 1.3.
9.2 Checking Communication Status Based on LED Indication
Check the status of the "RD" and "SD" indicator LEDs provided in the optional equipment.
While the N:N Network 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 mounting method, refer to the respective communication equipment manual.
2. Power supply (For FX0N-485ADP)
The FX0N-485ADP requires a driving power supply. Verify that the power supply is correctly provided.
3. Wiring
Verify that the wiring to all communication equipment is correct. If the communication equipment is wired
incorrectly, communication is not possible.
→ For wiring method check, refer to Chapter 4.
9.4 Checking Sequence Program
1. Communication setting in the sequence program
Verify that the parallel link is not set. Using both the parallel link and the N:N Network at the same time is not
allowed.
Verify that the communication format (D8120 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 reboot the PLC's power.
→ For communication setting, refer to Chapter 5.
LED status
Operation status
RD SD
Flashing Flashing Data is being sent or received.
Flashing Off Data is received, but is not sent.
Off Flashing Data is sent, but is not received.
Off Off Data is not sent nor received.
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