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(a) Precautions
[When interrupt conditions are always established with "Level Detect" being set to "Detection Method"]
The interrupt process is performed for each link scan; therefore, if the sequence scan time is much longer than
the link scan time, a watchdog timer error may occur in the CPU module due to the prolonged sequence scan.
To avoid this, check the conditions using a program and do not use the interrupt settings.
[Before executing an interrupt program]
Execute the EI instruction in the main routine program and enable the interrupt. (Refer to the MELSEC-L CPU
Module User's Manual (Function Explanation, Program Fundamentals).)
96
Main routine
program
I0
I/O interrupt
program
Interrupt pointer
Enable interrupt
EI
FEND
IRET
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Troubleshooting
