Omron C200HE ユーザーズマニュアル

The I/O response time is the time it takes for the PC to output a control signal
after it has received an input signal. The time it takes to respond depends on the
cycle time and when the CPU Unit receives the input signal relative to the input
refresh period.

The minimum and maximum I/O response time calculations described below
are for where IR 00000 is the input bit that receives the signal and IR 00200 is the
output bit corresponding to the desired output point.

00000

00200

The PC responds most quickly when it receives an input signal just prior to the
I/O refresh period in the cycle. Once the input bit corresponding to the signal has
been turned ON, the program will have to be executed once to turn ON the out-
put bit for the desired output signal and then the I/O refresh operation would
have to be repeated to refresh the output bit. The I/O response time in this case
is thus found by adding the input ON-delay time, the cycle time, and the output
ON-delay time. This situation is illustrated below.

Cycle time

Input

signal

Output

signal

Cycle

Cycle time

I/O refresh

I/O response time

Output ON delay

Input

ON delay

Instruction
execution

Instruction
execution

Instruction
execution

CPU Unit reads

input signal

Minimum I/O response time = 

Input ON delay + Cycle time + Output ON delay