F-22
5 Troubleshooting
5.1 PLC Version Number Check
FX
3U
/FX
3UC
Series PLC User's Manual - Analog Control Edition
FX3U-4AD-TC-ADP (4-channel Thermocouple Data Input)
5. Troubleshooting
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 PLC
• Wiring
• Special devices
• Programs
• Error status
5.1 PLC Version Number Check
• Any versions (from Ver.2.20 (initial version) to the latest version) of the FX3U Series are compatible.
• Check the version number of FX
3UC-32MT-LT. The version number should be 1.30 or later.
→ For a detailed description of the version number check method, refer to Section 1.3.
5.2 Wiring Check
Check the following items for wiring:
1. Power
TC-ADP needs driving power. Verify that the power supply line is properly connected. Also check that the
POWER indicator lamp of TC-ADP is on.
2. Thermocouple cable
Use the insulation-type thermocouple and connect the thermocouple using the compensating lead wire. In
addition, separate the cable of the thermocouple from the other power cables or inductive cables.
3. To use thermocouple type J
To use thermocouple type J, shortcircuit the J-type terminals. If these terminals are not shortcircuited, the
temperature measurement data cannot be read out correctly.
→ For a detailed description of wiring, refer to Chapter 3.
5.3 Special Device Check
Check whether the special devices for TC-ADP are correctly used:
1. Selection of type K or J
Check if the special device for type K/J selection is correctly set.
Turn off the device to select thermocouple type K. Turn on the device to select thermocouple type J.
2. Temperature measurement
Check if the special device of the selected channel is correctly set.
This special device should be selected depending on the connecting position and the channel.
3. Number of averaging time
Verify if the set number of averaging time is within the specified range. The number of averaging time should
be set in the range from 1 to 4095. If the set number of averaging time is outside the specified range, an error
occurs.
4. Error status
Check that no error is detected on TC-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.
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