Precautions: When "Level Detect" Is Set For "Detection Method" And The Interrupt Condition Is Always Met; Before Executing An Interrupt Program; When Multiple Interrupts Simultaneously Occur; When The Master/Local Module Is In Test Mode Or Offline Mode - Mitsubishi Electric QJ71GF11-T2 User Manual
Melsec-q series cc-link ie field network master/
local module
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Using an interrupt program will eliminate the need for describing a start condition in a program. This leads to reduction in the
number of steps and sequence scan time.
(2) Precautions
(a) When "Level Detect" is set for "Detection Method" 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 "Level Detect" is set for "Detection Method" and the interrupt condition is always met, do not use
interrupt settings and correct the interrupt condition in the program.
(b) Before executing an interrupt program
Execute the EI instruction in a main routine program and enable an interrupt. (
Explanation, Program Fundamentals) for the CPU module used)
(c) When multiple interrupts simultaneously occur
The operation may delay.
(d) When the master/local module is in test mode or offline mode
The master/local module can send an interrupt request to the CPU module in online mode (cannot send the
request in test mode and offline mode).
Main routine
program
I0
I/O interrupt
program
Interrupt pointer
CHAPTER 7 PARAMETER SETTING
Enable interrupt
EI
FEND
IRET
User's Manual (Function
109
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