Response Time For Built-In Input Interrupts - Omron CJ2 - 02-2010 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 Built-in Input Interrupts

The response time for built-in input interrupt tasks is the time from when a built-in input to a Pulse I/O
Block 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 built-in input interrupt tasks depends on the total of the hard-
ware interrupt response time and software interrupt response time.
Input
Reading built-in interrupt
status
Executing interrupt task
Response time for built-in 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 built-in input interrupts
I/O refresh
Instruction
execution
Output ON delay
CJ2 CPU Unit Software User's Manual