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Troubleshooting
124
Doc No: UMAN\FL\0110
Rev. No.: 1.02B
No
Device/register Name
Function
1
MW01_0
CPU error (down)
ON at error state
2
MW01_1
I/O error
ON at error state
3
MW01_2
Program error
ON at error state
4
MW01_5
Clock/calendar error(alarm)
ON when clock/calendar data is illegal
5
MW01_6
Retentive data loss/invalid(alarm) ON when retentive data in RAM are invalid
6
MW01_11
System Watchdog error (down) ON at error state
7
MW01_13
I/O mismatch (down)
ON at error state
8
MW01_14
Analog Power Fail
ON at error state
9
MW01_15
I/O BCC error (down)
ON at error state
10
MW02_1
Scan time over (alarm)
ON when the scan time exceeds 200 ms
ROM Errors:
If the PLC does not have a program ( Firmware / Application / Ladder ) it remains in the wait loop as given in the Flow
Chart. The LEDs are used to indicate these conditions. These errors are not logged in the event history.
No
Condition
Indication
1
No Firmware or Firmware corrupted.
RUN LED and ERR LED blinks at one second interval
simultaneously.
2
No Application or Application corrupted.
ERR LED blinks at one second interval.
3
No Ladder or Ladder corrupted.
ERR LED blinks at one second interval.
Diagnosis Registers for Serial and Ethernet Communication channels:
Following system registers and system coils can be used for the control and diagnosis of communication channels:
Register / Coil Tag Name
Read / Write
Description
SW0003_14
COM1 Status
Read only
0 = Communication Error
1= Communicating with Master
SW0003_15
COM2 Status
Read only
0 = Communication Error
1= Communicating with Master
SW0003_13
COM3 Status
Read only
0 = Communication Error
1= Communicating with Master
SW0018
COM1 failed node
Read/write
Shows time in sec recover the communication
reconnect time (Sec)
with failed nodes for port1.the default value is
60Sec
SW0019
COM2 failed node
Read/write
Shows time in sec recover the communication
reconnect time (Sec)
with failed nodes for port1.the default value is
60Sec
SW0022
COM3 failed node
Read/Write
Shows time in sec recover the communication
reconnect time (Sec)
with failed nodes for port3.the default value is
60Sec
S0021
COM1 failed node
Read/write
If this bit is set communication with the failed
reconnect control
nodes is detected after scan time SW0018 for
port1.By default : ON