Mitsubishi Q12PRHCPU - Page 335

8
TROUBLESHOOTING
8.2 Error Clear
8 - 34
1
OVERVIEW
2
SYSTEM CONFIGURATION
3
TRACKING CABLE
4
PROCEDURE FOR STARTING UP A REDUNDANT SYSTEM
5
REDUNDANT SYSTEM FUNCTIONS
6
REDUNDANT SYSTEM NETWORKS
7
PROGRAMMING CAUTIONS
8
TROUBLESHOOTING
3) If an error has occurred due to a problem other than that of the CPU module, it
will not be removed even when clearing the error is attempted using SM1649
and SD1649.
[Example]
The cause of the SP. UNIT DOWN error cannot be removed by performing
error clear operation using SM1649 and SD1649, as the error could have
occurred in a base unit (including extension cables), network module, etc.
Remove the cause of the error by referring to the error code list.
4) If the cause of the error is not removed after error clear has been performed,
the same error will be detected.
5) Error clear processing is performed by END processing.
Therefore, an error cannot be cleared unless the END instruction is executed
with SM1649 ON.
(c) Sample Program for Clearing Standby System CPU Module Error
The following shows a sample program for clearing the standby system error by
the control system CPU module.
[Sample Program]
A continuation error currently occurring in the standby system is cleared when
the error clear command (M100) turns ON.
(Create the control system's program that enables the ON/OFF status of
SM1649 to be held for one scan or longer so that the standby system will detect
the SM1649 change, i.e., SM1649 turns from OFF to ON or OFF to ON.)
Diagram 8.18 Sample Program for Clearing Standby System CPU Module Error
When M0 is set to ON in the System B
CPU module, Y100 is also set to ON
When a connection error occurs in the
standby system set M102 to ON.
Set the standby system error clear
command (SM1649) to ON.
Initialize (clear) SD1649.
Set SM1649 to OFF.
Set M102 to OFF.
The error code for standby system
errors is stored in SD1649.
SM1510
M1000N0
SM1513 SM1515 SM1516 SM1600
0
7
11
16
20
MC N0 M1000
M100 M102 SM1610
SET M102
SM1649
RST SM1649
RST SD1649
RST M102
SET SM1649
MCR N0
M102
MOVP SD1649SD1610