Mitsubishi MELSEC-F FX3U-4AD-PT-ADP User Manual

C-23
6 Troubleshooting
6.3 Special Device Check
FX 3U /FX 3UC Series PLC User's Manual - Analog Control Edition
FX3U-4AD-ADP (4-channel analog Input)
A
Common Items
B
FX
3UC
-4AD
C
FX
3U
-4AD-ADP
D
FX
3U
-4DA-ADP
E
FX
3U
-4AD-PT
-ADP
F
FX
3U
-4AD-TC
-ADP
G
PID Instruction (FNC 88)
6.3 Special Device Check
Check whether the special devices for 4AD-ADP are correctly used:
1. Switching of input mode
Check that the special device for switching the input mode is correctly set.
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. 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.
3. Number of averaging time
Check that 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 4AD-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.
6.4 Program Check
Check the following items for a program:
1. Clearing of error status at power on
When the power is turned off and then on again, error status should be cleared (the b6 and the b7 should be
turned off) using the program.
2. Check of storage devices
Check if different digital values are not stored in the same device in the other programs.

Mitsubishi MELSEC-F FX3U-4AD-PT-ADP Specifications

General

Brand	Mitsubishi
Model	MELSEC-F FX3U-4AD-PT-ADP
Category	Controller
Language	English