Mitsubishi FX3U-232-BD User Manual page 657

FX Series PLC User's Manual - Data Communication Edition
Remote Maintenance
8. Troubleshooting
This chapter explains troubleshooting.
8.1 Checking FX PLC Applicability
Verify that the FX PLC main unit version is applicable to remote maintenance.
8.2 Checking Programming Tool Applicability
Verify that the programming tool version is applicable to remote maintenance.
FXGP/WIN cannot use remote maintenance when it is used in the following Windows:
- Windows NT4.0
- Windows 2000
- Windows XP
8.3 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
When the power is turned ON, the FX PLC transfers the AT command to the connected modem. At this time,
the "RXD (RD)" and "TXD (SD)" indicator LEDs in the communication equipment light instantaneously.
If modem initialization is not set in parameters in the FX PLC, however, these LEDs do not light.
If the wiring and/or modem specifications are different, these LEDs flash several times, but the FX PLC does
not transfer the AT command.
8.4 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.
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 version applicability check, refer to Section 1.3.
→ For the version applicability check, refer to Section 1.4.
Operation status
8 Troubleshooting
8.1 Checking FX PLC Applicability
I-47
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G
H
I
Apx.