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FX Series PLC User's Manual - Data Communication Edition
Programming Communication
7 Troubleshooting
7.1 Checking PLC Version Applicability
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.
→ For the version applicability check, refer to Section 1.3.
7.2 Checking Programming Tool Applicability
Verify that the programming tool version is applicable for programming communication.
→ For the version applicability check, refer to Section 1.4.
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.
7.4 Checking Installation
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.
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.
→ For the setting of parameters in the PLC, refer to Chapter 5.
LED status
Operation status
RXD (RD) TXD (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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