H-37
6 Troubleshooting
6.1 PLC Version Number Check
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX
3U
-3A-ADP (2-channel Analog Input, 1-channel Analog Output)
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.
Refer to the following items when conversion data is not input or output, or when proper digital values are not
input or output.
• PLC version number
• Installation
• Wiring
• Special devices
• Programs
• Error status
6.1 PLC Version Number Check
• Any versions (from Ver. 1.00 (initial version) to the latest version) of the FX3S Series are compatible.
• Check the version number of the FX
3G Series PLC. The version number should be 1.20 or later.
• Any versions (from Ver. 1.40 (initial version) to the latest version) of the FX
3GC Series are compatible.
• Check the version number of the FX
3U/FX3UC Series PLC. The version number should be 2.61 or later.
→ For a detailed description of the version check method,
refer to A. Common Items Subsection 5.1.2.
6.2 Wiring Check
Check the following items for wiring:
1. Power
The 3A-ADP needs driving power. Verify that the power supply line is properly connected. Also check that the
POWER indicator lamp of the 3A-ADP is on.
2. Analog input/output line
Use 2-core twisted shielded pair cable for the analog input/output 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 proper digital data.
→ For a detailed description of wiring, refer to Chapter 3.
6.3 Special Device Check
Check whether the special devices for the 3A-ADP are being used correctly:
1. Input mode switching
Check that the special device for switching the input mode is set correctly.
Turn off the device to set the input mode to the voltage input mode. Turn on the device to set the input mode
to the current input mode.
2. Output mode switching
Verify that the special device for switching the output mode is correctly set.
Turn off the device to set the output mode to the voltage output mode. Turn on the device to set the output
mode to the current output mode.
3. Input data
Verify that the special device of the selected channel is correctly selected. This special device should be
selected depending on the connecting position and the channel.
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