Instruction manual
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6 INSPECTION AND MAINTENANCE 
6.6.2 Troubleshooting of Motion CPU module 
This section describes the contents of troubles for the error codes and corrective 
actions of the troubles. 
As for troubleshooting of PLC CPU, refer to the QCPU User's Manual (Hardware 
Design, Maintenance and Inspection) of their respective modules. 
As for troubleshooting of I/O modules, refer to the "I/O Module Type Building Block 
User's Manual" of their respective modules. 
POINT 
Check that the operating system software is installed before starting the Motion 
CPU module. 
(1) Troubleshooting flowchart 
The following show the contents of the troubles classified into a variety of groups 
according to the types of events. 
(a)
"Flowchart for when "POWER" LED turns off"
Error-occurrence description
"POWER" LED turns off
"A00" displays on 7-segment LED
(c)
"Flowchart for when "A00" displays on 7-segment LED"
"BT " displays on 7-segment LED
"AL" "L01" displays on 7-segment LED
"AL" "A1" " " displays on 7-segment 
LED
" . . ." displays on 7-segment LED
Servo amplifier does not start
"AL" "S01" displays on 7-segment LED
(d)
"Flowchart for when "AL"  "L01" displays on 7-segment LED"
(e)
"Flowchart for when "AL"  "A1"  "  " displays on 7-segment LED"
(f)
"Flowchart for when "BT " displays on 7-segment LED"
(g)
"Flowchart for when " . . ." displays on 7-segment LED"
(h)
"Flowchart for when servo amplifier does not start"
(i)
"Flowchart for when "AL" "S01" displays on 7-segment LED"
" ." does not flash in the first digit of 
7-segment LED
(b)
"Flowchart for when " ." does not flash in the first digit of 
7-segment LED"










