Response Time For Input Interrupts - Omron CJ2 CPU - REV 10-2010 User Manual

12 CPU Unit Cycle Time
Maximum I/O Response Time
The I/O response time is longest when data is retrieved immediately after I/O refresh of the Input
Unit.
The maximum I/O response time is the total of the Input ON delay, (the cycle time × 2), and the Output ON delay.
Input
(Refreshed in CPU Unit)
Output
Calculation Example
Conditions:
Input ON delay:
Output ON delay: 0.2 ms
Cycle time:
Minimum I/O response time = 1.5 ms + 20 ms + 0.2 ms = 21.7 ms
Maximum I/O response time = 1.5 ms + (20 ms × 2) + 0.2 ms = 41.7 ms

12-2-7 Response Time for Input Interrupts

The response time for input interrupt tasks is the time from when a pulse input to a Pulse I/O Module
connected to a CJ2M CPU Unit turns ON or OFF until the I/O interrupt task is executed. The length of
the interrupt response time for input interrupt tasks depends on the total of the hardware interrupt
response time and software interrupt response time.
Input
Reading pulse interrupt
status
Executing interrupt task
Response time for input interrupts = Hardware interrupt response time + Software interrupt response time
12-14
Input ON delay
Cycle time Cycle time
Instruction
Instruction
execution
execution
Maximum I/O response time
1.5 ms
20.0 ms
Hardware interrupt response time
Software interrupt response time
Response time for input interrupts
I/O refresh
Instruction
execution
Output ON delay
CJ2 CPU Unit Software User's Manual