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6 Troubleshooting
6.1 PLC Version Number Check
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4AD-ADP (4-channel analog Input)
A
Common Items
B
FX
3U
-4AD
FX
3UC
-4AD
C
FX
3U
-4AD-ADP
D
FX
3G
-2AD-BD
E
FX
3U
-4DA
F
FX
3U
-4DA-ADP
G
FX
3G
-1DA-BD
H
FX
3U
-3A-ADP
I
FX
3U
-4AD-PT
-ADP
J
FX
3U
-4AD-PTW
-ADP
6. Troubleshooting
This chapter describes troubleshooting methods and error statuses.
If the A/D conversion data is not input, or if the proper digital value is not input, check the following items:
• PLC version number
• Wiring
• Special devices
• Programs
• Error status
6.1 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 the FX
3UC Series PLC. The version number should be 1.20 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.
6.2 Wiring Check
Check the following items for wiring:
1. Power
The 4AD-ADP needs driving power. Verify that the power supply line is properly connected. Also check that
the POWER indicator lamp of the 4AD-ADP is on.
2. Analog input line
Use 2-core twisted shielded pair cable for the analog input line. In addition, be sure to separate the analog
input line from other power lines or inductive lines.
3. Use of current input mode
To use the current input mode for a channel, be sure to shortcircuit the line between the V+ terminal and the
I+ terminal ( : channel number) of the channel. If the line is not shortcircuited, data will not be converted
into correct digital data.
→ For a detailed description of wiring, refer to Chapter 3.