Mitsubishi Electronics MELSEC-F Manuel D’Utilisation
H-34
6 Troubleshooting
6.1 PLC Version Number Check
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX
3U
-3A-ADP (2-channel analog Input, 1-channel analog output)
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 correct digital values are not
input or output.
• PLC version number
• Installation
• Wiring
• Special devices
• Programs
• Error status
Refer to the following items when conversion data is not input or output, or when correct digital values are not
input or output.
• PLC version number
• Installation
• Wiring
• Special devices
• Programs
• Error status
6.1
PLC Version Number Check
• Check the version number of the FX
3U
, FX
3UC
Series PLC. The version number should be 2.61 or later.
• Check the version number of the FX
3G
Series PLC. The version number should be 1.20 or later.
→ 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 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.
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.
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.
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.
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.
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.
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.
selected depending on the connecting position and the channel.