Troubleshooting Flowcharts
Section 5-2
(From preceding page)
B
(A40207 ON)
YES
YES
YES
YES
YES
YES
CPU Bus Unit
error?
Parity error occurs. Check
erroneous Unit with word
A422
Check noise source and
environment. Turn off erro
neous bit of word A001
and restart
-
NO
(A40206 ON)
SYSMAC
BUS/2 error?
Check Maser and Slave
addresses with words
A424/A480 to A487
Check cable and power
supply of Slave
NO
(A40205 ON)
Check Master and Slave
addresses with words
A425/A470 to A477
Check cable and Power
Supply Unit of Slave Rack
SYSMAC BUS
error?
NO
Battery error?
NO
(A40204 ON)
A42615 ON: CPU battery
error; A42614 ON:
Memory card battery error
Replace battery. Check
connection of battery
(A40203 ON)
Unit No. is different from
Change setting of Unit
No., or create I/O table
CPU Bus Unit
setting error?
registered No. Check erro
-
neous Unit with word A427
NO
(A40202 ON)
Momentary
Check supply voltage and
power supply wiring
power interrup
-
tion error?
NO
A
ALARM indicator does not
(To preceding page)
go OFF even after all er
-
rors have been checked
and corrected
Replace Unit
I/O Check Flowchart
It is assumed that the ladder diagram shown below is programmed and that
SOL1 malfunctions.
(LS1)
000002
(LS2)
000003
000500
SOL1
000500
Given such a malfunction, the flowchart on the following page may be used to
help locate the problem.
89
OMRON [ OMRON ELECTRONICS LLC ]
