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Appendices
A-3
Response Performance
A-3-1
I/O Response Time
The I/O response time is the time it takes from when an input turns ON, the data is recognized by the
CPU Unit, and the ladder programs are executed, up to the time for the result to be output to an output
terminal.
The length of the I/O response time depends on the following conditions.
• Timing of Input Bit turning ON.
• The cycle time
Minimum I/O Response Time
The I/O response time is shortest when data is retrieved immediately before I/O refresh of the CPU Unit.
The minimum I/O response time is calculated as follows:
Minimum I/O response time = Input ON delay + Cycle time + Output ON delay
Note The input and output ON delays depend on the type of terminals used on the CPU Unit or the model number
of the Unit being used.
Inputs:
(Status read to
the CPU Unit.):
Outputs:
Maximum I/O Response Time
The I/O response time is longest when data is retrieved immediately after I/O refresh period of the
CPU Unit.
The maximum I/O response time is calculated as follows:
Maximum I/O response time = Input ON delay + (Cycle time × 2) + Output ON delay
Inputs:
(Status read to
the CPU Unit.):
Outputs:
A-80
:I/O refresh
Input ON delay
Cycle time
Cycle time
Instruction
Instruction
execution
execution
Output ON delay
Minimum I/O
Response Time
:I/O refresh
Input ON delay
Cycle time
Cycle time
Instruction
Instruction
execution
execution
Maximum I/O Response Time
Instruction
execution
Output ON delay
CP1E CPU Unit Software User's Manual(W480)
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