Mitsubishi Electric MELSEC iQ-R Series User Manual page 70

Precautions
■When "Detection Method" is set to "Level" and the interrupt condition is always met
If the sequence scan takes much longer than the link scan, since interrupt processing is activated in each link scan, sequence
scan time may greatly increase, resulting in a watchdog timer error of the CPU module.
When "Detection Method" is set to "Level" and the interrupt condition is always met, do not use interrupt settings and correct
the interrupt condition in the program.
■Before executing an interrupt program
Execute the EI instruction in a main routine program and enable an interrupt. ( MELSEC iQ-R CPU Module User's Manual
(Application))
■When multiple interrupts have simultaneously occurred
The operation may delay.
■When the RJ71LP21-25 mode is set to "Offline"
The module cannot send an interrupt request to the CPU module when the mode is set to "Offline".
■Starting an interrupt program by the rising/falling edge of the specified device
Do not use the rising/falling edge of a specified device (such as the PLS and PLF instructions) as a trigger of an interrupt
program because a change in the device may fail to be read.
■An interrupt cannot be generated
A changed value in the interrupt condition device cannot be detected if the changed value is shorter than the transmission
delay time.
■Using cyclic data in an interrupt program
When an interrupt program is executed, the link device data is not link-refreshed to CPU module devices. Directly access the
link devices of the RJ71LP21-25 by direct access.
2 PARAMETER SETTINGS
68
2.4 Application Settings