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83
CPU Unit Operation
Section 2-4
Note
CJ-series Special I/O Unit, CJ-series CPU Bus Unit, USB port, serial port,
and communications port servicing is allocated 4% of the previous cycle time
by default (the default can be changed) for each service. If servicing is sepa-
rated over many cycles, delaying completion of the servicing, set the same
allocated time (same time for all services) rather than a percentage under
execute time settings in the PLC Setup.
2-4-3
I/O Refresh Methods
I/O for CPU Unit built-in I/O and I/O on CPM1A Expansion Units and Expan-
sion I/O Units is performed at the following times.
1,2,3...
1.
Cyclic refresh period
2.
When instructions with an immediate refresh variation are executed
3.
When IORF(097) is executed
Cyclic Refreshing
I/O is refreshed after all the instructions in executable tasks have been exe-
cuted.
Communications port servic-
ing
• Servicing to execute network communications or
serial communications for the SEND, RECV, CMND
or PMCR instructions using communications ports
0 to 7 (internal logical ports)
• Servicing to execute background execution using
communications ports 0 to 7 (internal logical ports)
Built-in flash memory access
servicing
• Read/write processing for built-in flash memory
Memory Cassette access ser-
vicing
• Read/write processing for a Memory Cassette
Service
Description
END(001)
END(001)
END(001)
Task
Task
Task
I/O refresh period
Cycle
I/O terminal
status
Содержание CP1H-CPU - 05-2006
Страница 1: ...OPERATION MANUAL CP1H CPU Unit SYSMAC CP Series CP1H X40D CP1H XA40D CP1H Y20DT D Cat No W450 E1 02...
Страница 2: ...CP1H X40D CP1H XA40D CP1H Y20DT D CP1H CPU Unit Operation Manual Revised May 2006...
Страница 3: ...iv...
Страница 11: ...xii TABLE OF CONTENTS...
Страница 15: ...xvi...
Страница 19: ...xx...
Страница 31: ...xxxii Conformance to EC Directives 6...
Страница 71: ...40 Function Blocks Section 1 5...
Страница 133: ...102 Computing the Cycle Time Section 2 7...
Страница 169: ...138 CPM1A Expansion I O Unit Wiring Section 3 6...
Страница 411: ...380 Clock Section 6 8...
Страница 519: ...488 Replacing User serviceable Parts Section 10 2...
Страница 527: ...496 Standard Models Appendix A...
Страница 535: ...504 Dimensions Diagrams Appendix B...
Страница 628: ...597 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 629: ...598 Connections to Serial Communications Option Boards Appendix F...
Страница 659: ...628 PLC Setup Appendix G...
Страница 665: ...634 Index work words 159 write protection 370...
Страница 667: ...636 Revision History...