D-76
FX Series PLC User's Manual - Data Communication Edition
Computer Link
8 Troubleshooting
8.1 Checking FX PLC Version Applicability
8. Troubleshooting
This chapter explains troubleshooting.
8.1 Checking FX PLC Version Applicability
Verify that the FX PLC main unit is an applicable version.
→ For the version applicability check, refer to Section 1.3.
8.2 Checking Communication Status Based on LED Indication
Check the status of the "RD(RXD)" and "SD(TXD)" indicator LEDs provided in the optional equipment.
While computer link is executed normally, both LEDs flash brightly.
If they do not flash, check the wiring, station number settings and communication setting.
8.3 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 provided correctly.
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.
LED status
Operation status
RD(RXD) SD(TXD)
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 or received.
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