Mitsubishi MELSEC-Q Series User Manual page 224

12
COUNTER FUNCTION
12
- 10 12.5 Coincidence Detection Function
(d) The following two methods are available for using particular SI numbers only.
1) Using the interrupt pointer setting with parameters
Only the interrupt factors, starting from the "Start SI No." for the number set at
"Interrupt pointer No. of module" in the [Intelligent function module interrupt
pointer setting] screen, are used.
For example, when the "Start SI No." and "Interrupt pointer No. of module" are
set to 1 and 2 respectively, only SI 1 and 2 can be used.
The interrupt function is not used if the interrupt pointer setting with parameters
has not been made.
2) Using the IMASK instruction from the sequence program
With the IMASK instruction, whether to enable or disable (interrupt mask) the
interrupt program execution can be set to each interrupt pointer number.
For details of the IMASK instruction, refer to QCPU (Q Mode)/QnACPU
Programming Manual (Common Instructions).
POINT
• A coincidence detection interrupt occurs when the count value
coincidence signal rises (from OFF to ON).
This means that, unless the count value coincidence signal is turned OFF
by performing coincidence signal reset, the next interrupt request is not
issued.
• When the interrupt occurrence interval is within "interrupt delay time
(approx. 100 to 200 s) + interrupt program processing time", "Watch dog
timer error"of the CPU may occur and/or an interrupt request may not be
detected. For details, refer to QCPU (Q Mode)/QnACPU Programming
Manual (Common Instructions).
Interrupt
request
Interrupt occurrence interval