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FX Series PLC User's Manual - Data Communication Edition
Programming Communication
7.
Troubleshooting
This chapter explains troubleshooting.
7.1
Checking PLC Version Applicability
When executing programming communication using an FX PLC and communication equipment operating in
accordance with RS-422 or RS-232C, verify that the FX PLC is an applicable version.
7.2
Checking Programming Tool Applicability
Verify that the programming tool version is applicable for programming communication.
7.3
Checking Communication Status Based on LED Indication
Check the status of the "RXD (RD)" and "TXD (SD)" indicator LEDs provided in the optional equipment.
LED status
RXD (RD)
Flashing
Flashing
Off
Off
7.4
Checking Installation
1. Mounting status
If the communication equipment is not securely connected to the PLC, communication is not possible.
7.5
Checking Parameters in PLC
1. Checking the communication setting
Verify that non-protocol communication or computer link communication is not set in the parameters of the FX
PLC. If such communication is already set, programming communication with optional communication
equipment cannot be used.
7.6
Checking Sequence Program
1. Checking the contents of the communication setting
Verify that no communication format (D8120, D8400 and D8420, N:N Network: D8173 to D8180, and Parallel
Link: M8070 and M8071) is being used in the sequence program.
If any communication format is being used in the sequence program, communication will not function
correctly.
H-48
TXD (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 nor received.
For the mounting method, refer to the respective communication equipment manual.
For the version applicability check, refer to Section 1.3.
For the version applicability check, refer to Section 1.4.
Operation status
For the setting of parameters in the PLC, refer to Chapter 5.
7 Troubleshooting
7.1 Checking PLC Version Applicability
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