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98
Computing the Cycle Time
Section 2-7
Calculation Example
Conditions:
Input ON delay
1 ms
Output ON delay
0.1 ms
Cycle time
20 ms
Minimum I/O response time = 1 ms + 20 ms + 0.1 ms = 21.1 ms
Maximum I/O response time = 1 ms + (20 ms
×
2) + 0.1 ms = 41.1 ms
Input Response
Times
Input response times can be set in the PLC Setup. Increasing the response
time reduces the effects of chattering and noise. Decreasing the response
time allows reception of shorter input pulses, (but the pulse width must be
longer than the cycle time).
PLC Setup
2-7-8
Interrupt Response Times
Input Interrupt Tasks
The interrupt response time for I/O interrupt tasks is the time taken from when
a built-in input has turned ON (or OFF) until the I/O interrupt task has actually
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
Input
Input response time
Input
I/O refresh
CPU Unit
CPU Unit
Input response time
The pulse width is
less than the input
response time, so
it is not detected.
Name
Description
Settings
Default
Input constants
Input response times 00 hex: 8 ms
10 hex: 0 ms
11 hex: 0.5 ms
12 hex: 1 ms
13 hex: 2 ms
14 hex: 4 ms
15 hex: 8 ms
16 hex: 16 ms
17 hex: 32 ms
00 hex (8 ms)
Summary of Contents for CP1H-CPU - 05-2006
Page 2: ...CP1H X40D CP1H XA40D CP1H Y20DT D CP1H CPU Unit Operation Manual Revised May 2006...
Page 3: ...iv...
Page 11: ...xii TABLE OF CONTENTS...
Page 15: ...xvi...
Page 19: ...xx...
Page 31: ...xxxii Conformance to EC Directives 6...
Page 71: ...40 Function Blocks Section 1 5...
Page 133: ...102 Computing the Cycle Time Section 2 7...
Page 169: ...138 CPM1A Expansion I O Unit Wiring Section 3 6...
Page 411: ...380 Clock Section 6 8...
Page 519: ...488 Replacing User serviceable Parts Section 10 2...
Page 527: ...496 Standard Models Appendix A...
Page 535: ...504 Dimensions Diagrams Appendix B...
Page 628: ...597 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 629: ...598 Connections to Serial Communications Option Boards Appendix F...
Page 659: ...628 PLC Setup Appendix G...
Page 665: ...634 Index work words 159 write protection 370...
Page 667: ...636 Revision History...