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4.
"Start SI No." on the intelligent module side
Set the smallest number for intelligent function module interrupt pointers specified in "Interrupt (SI) No." of
the "Interrupt Setting" in the network parameter setting.
Setting range: 0 to 15
(3) Precautions
(a) When interrupt conditions are always established with "Level Detect" being set to
"Detection Method"
Because the interrupt processing is performed for each link scan, 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 program and do not use the interrupt setting.
(b) Before executing the interrupt program
Execute the EI instruction in the main routine program and allow the interrupt. For details on the interrupt
program, refer to the MELSEC-L CPU Module User's Manual (Function Explanation, Program Fundamentals).
174
Main routine
program
I0
I/O interrupt
program
Enable interrupt
EI
FEND
IRET
Interrupt pointer
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Troubleshooting
