Mitsubishi Electric MELSEC iQ-F Series Training Manual page 54

Monitoring on the ladder editor
The on/off states of contacts and coils and the current values of word devices and labels can be monitored on the ladder
editor.
(1)
1.
Select [Online]  [Monitor]  [Start Monitoring] on the menu bar.
2.
Monitor the on/off states of contacts and coils and the current values of word devices and labels.
■On/off state display
The on/off states are displayed on the editor as follows:
■Changing the current value
To change the current value, select the cell on the ladder editor, and press  + double-click the cell or press  + 
while the program is being monitored.
The program can also be monitored on the Device/Buffer Memory Batch window of the Watch window.
(GX Works3 Operating Manual)
4.14
Troubleshooting
This section describes errors that may occur during system operation, error causes, and actions to be taken.
For the troubleshooting specific to each module, refer to the manual for the module used.
Saving the program and devices at the time of an error helps to analyze the error cause. (GX Works3
Operating Manual)
Troubleshooting procedure
When the system has any trouble, perform troubleshooting in the following order.
1.
Check that each module is properly mounted and wired.
2.
Check the LED status of the CPU module. (Page 40 Checking with LEDs)
3.
Check the LED status of each intelligent function module. (User's manuals for each module)
4.
Connects the engineering tool and execute the Module diagnostics(CPU Diagnostics) function. The error cause and the
action to be taken can be displayed. (Page 41 Module diagnostics (CPU Diagnostics))
5.
If the error cause cannot be identified in steps 1 to 3, troubleshoot by symptom. (User's manuals for each module)
(1) The on/off states of the contacts and coils are
displayed.
(1)
(2) The current value of the word/double word type
data is displayed.
(2)
4 PROCEDURES BEFORE OPERATION
39
4.14 Troubleshooting
4