470
Computing the Cycle Time Section 10-4
Calculation Example
Conditions: Input ON delay 1.5 ms
Output ON delay 0.2 ms
Cycle time 20.0 ms
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
10-4-7 Interrupt Response Times
I/O Interrupt Tasks The interrupt response time for I/O interrupt tasks is the time taken from when
an input from a CJ1W-INT01 Interrupt Input Unit (or the built-in I/O in a CJ1M
CPU Unit) has turned ON (or OFF) until the I/O interrupt task has actually
been executed.
The length of the interrupt response time for I/O interrupt tasks depends on
the following conditions.
When an Interrupt Input Unit is Used
When CJ1M CPU Unit Built-in I/O is Used
Note I/O interrupt tasks can be executed (while an instruction is being executed, or
by stopping the execution of an instruction) during execution of the user pro-
gram, I/O refresh, peripheral servicing, or overseeing. The interrupt response
time is not affected by the Input of the Interrupt Input Unit turning ON during
any of the above processing operations.
I/O refresh
Input
Output
Cycle timeCycle time
Input ON delay
Output ON delay
Maximum I/O response time
(Interrupt to CPU Unit)
Instruction
execution
Instruction
execution
Instruction
execution
Item CPU Unit Time
Hardware response CJ1-H-R CPU Unit Upward differentiation: 0.05 ms,
Downward differentiation: 0.5 ms
CJ1-H CPU Units
CJ1M CPU Unit
CJ1 CPU Unit
Software interrupt
response
CJ1-H-R CPU Unit 40 µs
CJ1-H CPU Units 124 µs
CJ1M CPU Unit 169 µs
CJ1 CPU Unit 320 µs
Item CPU Unit Time
Hardware response CJ1M CPU Unit Upward differentiation: 0.03 ms,
Downward differentiation: 0.15 ms
Software interrupt
response
CJ1M CPU Unit 93 to 209 µs
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