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5 Troubleshooting
5.1 PLC Version Number Check
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4AD-PNK-ADP (4-channel Resistance Thermometer Data Input)
K
FX
3U
-4AD-PNK
-ADP
L
FX
3U
-4AD-TC
-ADP
M
PID Instruction
(FNC 88)
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 the 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 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.
5.2 Wiring Check
Check the following items for wiring:
1. Power
The PNK-ADP needs driving power. Verify that the power supply line is properly connected. Also check that
the POWER indicator lamp of the PNK-ADP is on.
2. Resistance thermometer sensor cable
When using a 2-wire temperature sensor type, short-circuit the [L-] terminal and the [I-] terminal.
Separate the cable of the resistance thermometer sensor from the other power cables or areas easily affected
by inductive noise (of the commercial power, etc.).
→ For a detailed description of wiring, refer to Chapter 3.
5.3 Special Device Check
Check whether the special devices for the PNK-ADP are correctly used:
1. Input sensor selection
Check if the special device for type Pt1000/Ni1000 selection is correctly set.
Turn off the device to select Pt1000. Turn on the device to select Ni1000.
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. Averaging time
Verify if 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.
4. Error status
Check that no error is detected in the PNK-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.