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Interval Timer Interrupts Section 7-4
The following timing chart shows the operation of the program as it is exe-
cuted.
Note (1) Counting continues even while the interrupt task is being executed.
(2) The input interrupts are masked after this point.
7-4 Interval Timer Interrupts
7-4-1 Applicable Models
7-4-2 Overview
Interval timers can be used to perform high-speed, high-precision timer inter-
rupt processing. The Motion Control Modules and Coordinator Module are
equipped with one interval timer each.
7-4-3 Interval Timer Interrupt Modes
There are two modes for interval timer operation.
• One-shot Mode
In one-shot mode, the interrupt is executed just once when the timer times
out.
• Scheduled Interrupt Mode
In scheduled interrupt mode, the timer is reset to the SV each time it times
out so the interrupt is repeated regularly at a fixed interval.
7-4-4 Using Interval Timer Interrupts
1,2,3... 1. Interrupt Mode
• Determine whether the timer will operate in one-shot mode or scheduled
interrupt mode.
2. Ladder Programming
• Use the STIM(980) instruction to set the timer SV and start the timer in
one-shot or scheduled interrupt mode.
• Create the interrupt task program.
10 counts
10 counts 20 counts
CIO 0000.00
Interrupt task 000
CIO 0000.01
Interrupt task 001
CIO 0002.00
(See note 1.)
(See note 1.)
(See note 2.)
Model number Functions
FQM1-CM001 Coordinator Module
FQM1-MMP21 Motion Control Module for Pulse I/O
FQM1-MMA21 Motion Control Module for Analog I/O