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85
Computing the Cycle Time
Section 2-7
2-7-7
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 user program is 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.
• 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.
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
Input
I/O refresh
Input ON delay
Output ON delay
Cycle time
Cycle time
(Interrupt to
CPU Unit)
Output
Minimum I/O
response time
Instruction
execution
Instruction
execution
Instruction
execution
Input
I/O refresh
Input ON delay
Output ON delay
Cycle time
Cycle time
(Interrupt to
CPU Unit)
Output
Maximum I/O
response time
Instruction
execution
Instruction
execution
Instruction
execution
Summary of Contents for CP1L-L14D Series
Page 2: ...CP1L L14D CP1L L20D CP1L M30D CP1L M40D CP1L CPU Unit Operation Manual Revised June 2007...
Page 3: ...iv...
Page 9: ...x...
Page 13: ...xiv TABLE OF CONTENTS...
Page 21: ...xxii...
Page 33: ...xxxiv Conformance to EC Directives 6...
Page 65: ...32 Function Blocks Section 1 5...
Page 153: ...120 CP CPM1A series Expansion I O Unit Wiring Section 3 6...
Page 523: ...490 Troubleshooting Unit Errors Section 9 4...
Page 531: ...498 Replacing User serviceable Parts Section 10 2...
Page 563: ...530 Auxiliary Area Allocations by Function Appendix C...
Page 611: ...578 Auxiliary Area Allocations by Address Appendix D...
Page 638: ...605 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 639: ...606 Connections to Serial Communications Option Boards Appendix F...
Page 669: ...636 Index...
Page 671: ...638 Revision History...