6.4 Troubleshooting System Errors
6-13
6
Maintenance and Inspection
6.4.4 Troubleshooting When ALM is Lit
When the ALM lamp (or RDY, RUN, and ALM lamps) of the LED indicators on the front panel of MP2300 lights up,
occurrence of a serious failure (hardware failure, user operation error, or I/O error) is likely. Stop the MP2300 by set-
ting the DIP switch No. 6 (STOP) of SW1 to ON, and investigate the cause using to the following flowchart.
* 1. For details on SW00041, refer to
6.4.5 ( 2 ) System Error Status
.
* 2. For details on the system registers from SW00080 to SW00088, refer to
6.4.5 ( 3 ) [ a ] Ladder Program User Oper-
ation Error Status 1
.
* 3. For details on the system registers from SW00110 to SW00188, refer to
6.4.5 ( 3 ) [ b ] Ladder Program User Oper-
ation Error Status 2
.
* 4. For details on the system registers from SW00200 to SW00247, refer to
6.4.5 ( 6 ) System I/O Error Status
.
START
NO
Replace the Module.
(User operation error)
SW00041 bit 8 = 1?
YES
Check SW00041
(
∗
1)
NO
(Hardware failure)
SW00041 bit 9 = 1?
YES
(I/O error)
Check the registers from SW00080
VQ
SW00088 to find the drawing type in
which the error count increased.
(
∗
2)
Check the following register of the
drawing type specified in a) to learn the
error code
(
∗
3)
DWG.A
DWG.I
DWG.H
DWG.L
: SW00111
: SW00127
: SW00143
: SW00175
Check the following register of the
drawing type specified in a) to learn
the reference source drawing number
(
∗
3)
DWG.A
DWG.I
DWG.H
DWG.L
: SW00123
: SW00139
: SW00155
: SW00187
Check the following register of the drawing
type specified in a) to learn the error DWG
number
(
∗
3)
DWG.A
DWG.I
DWG.H
DWG.L
: SW00122
: SW00138
: SW00154
: SW00186
Open the reference source drawing
by using the MPE720 ladder editor.
Open the faulty drawing by
using the MPE720 ladder editor.
Check the functions written in the step
number to find the cause of the error code
found in b) and correct the error.
Check the drawing to find the cause of
the error code found in b), and correct the
error.
Check the following register of the drawing
type specified in a) to find the step number
of the reference source drawing number
(
∗
3)
DWG.A
DWG.I
DWG.H
DWG.L
: SW00124
: SW00140
: SW00156
: SW00188
NO (Operation error inside drawing)
Is the drawing number 8000H?
YES (Operation error inside function)
b)
Check the I/O error status
(SW00200 to SW00247) to
find the error and correct
it.
(
∗
4)
a)
