Program Check; Special Device Check - Mitsubishi FX3U-4AD User Manual

FX /FX /FX PLC User's Manual - Analog Control Edition
3G 3U 3UC
FX -4AD-ADP (4-channel analog Input)
3U
6.3

Special Device Check

Check whether the special devices for the 4AD-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. 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. Averaging time
Check that 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 4AD-ADP.
If an error is detected, check the details of the error, and then check the wiring and programs.
6.4

Program Check

Check the following items for the program:
1. Clearing of error status at power on
When the power is turned off and then on again, the error status should be cleared (b6 and b7 should turn off)
using the program.
2. Check of storage devices
Verify that different values are not being stored in the same device by other parts of the program.
C-30
→ For a detailed description of special devices, refer to Chapter 4.
6 Troubleshooting
6.3 Special Device Check