Mitsubishi Electronics MELSEC-F Manuel D’Utilisation

5 Troubleshooting

FX

3G

/FX

3U

/FX

3UC

 PLC User's Manual - Analog Control Edition

FX

3U

-4AD-PTW-ADP (4-channel Platinum Resistance Thermometer Data Input)

This chapter describes the troubleshooting methods and error status.
If the temperature measurement data is not input, or if the proper digital value is not input, check the following
items:
• Version number of the PLC
• Wiring
• Special devices
• Programs
• Error status

• Any versions (from Ver.2.20 (initial version) to the latest version) of the FX

3U

 Series are compatible.

• Check the version number of the FX

3UC

 Series. The version number should be 1.30 or later.

• Any versions (from Ver.1.00 (initial version) to the latest version) of the FX

3G

 Series are compatible.

→ For a detailed description of the version number check method, refer to Section 1.3.

Check the following items for wiring:

The PTW-ADP needs driving power. Verify that the power supply line is properly connected. Also check that 
the POWER indicator lamp of the PTW-ADP is on.

Separate the cable of the platinum resistance thermometer from other power cables or inductive cables.

→ For a detailed description of wiring, refer to Chapter 3.

Check whether the special devices for the PTW-ADP are correctly used:

Verify that the special device for the selected channel is correctly selected. This special device should be
selected depending on the connecting position and the channel.

Check that the set averaging time is within the specified range. The averaging time should be set in the range
from 1 to 4095. If the set averaging time is outside the specified range, an error occurs.

Check that no error is detected in the PTW-ADP.
If an error is detected, check the details of the error, and then check the wiring and programs.

→ For a detailed description of special devices, refer to Chapter 4.