C-49
FX Series PLC User's Manual - Data Communication Edition
Parallel Link
9 Troubleshooting
9.1 Checking FX PLC Version Applicability
A
Comm
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B
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Paral
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D
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9. Troubleshooting
This chapter explains troubleshooting.
9.1
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.
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 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
0N
-485ADP)
The FX
0N
-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 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.
For communication setting, refer to Chapter 5.
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.
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 or received.
Summary of Contents for FX-485ADP
Page 2: ......
Page 120: ...B 2 FX Series PLC User s Manual Data Communication Edition N N Network ...
Page 188: ...C 2 FX Series PLC User s Manual Data Communication Edition Parallel Link ...
Page 244: ...D 2 FX Series PLC User s Manual Data Communication Edition Computer Link ...
Page 344: ...E 2 FX Series PLC User s Manual Data Communication Edition Inverter Communication ...
Page 700: ...H 2 FX Series PLC User s Manual Data Communication Edition Programming Communication ...
Page 752: ...I 2 FX Series PLC User s Manual Data Communication Edition Remote Maintenance ...
Page 817: ......