Mitsubishi Electric Melsec-Q172DCPU User Manual page 212

6 INSPECTION AND MAINTENANCE
(e) Flowchart for when "E
"E " displays when a hardware fault or software fault occurs.
The following shows the flowchart for when "E
LED at the power supply ON or operation start.
" " indicates the error code.
"E " displays on 7-segment LED
Is the
operating system
software installed to Motion
CPU module?
Reset the Multiple CPU system.
Does "E
on 7-segment LED?
END
" displays on 7-segment LED
NO
YES
NO
" disappear
YES
6 - 23
" displays on 7-segment
Install the operating system software.
Explain the error symptom and get
advice from our sales representative.