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82
CPU Unit Operation
Section 2-4
2-4-2
I/O Refreshing and Peripheral Servicing
I/O Refreshing
I/O refreshing involves cyclically transferring data with external devices using
preset words in memory. I/O refreshing includes the following:
• Refreshing between CPU Unit built-in I/O, CPM1A Expansion Units, and
CPM1A Expansion I/O Units and I/O words in the CIO Area
• Refreshing between CJ-series Special I/O Units and CJ-series CPU Bus
Units and the words allocated to these in the CIO Area (and for CPU Bus
Units, words allocated in the DM Area)
All I/O refreshing is performed in the same cycle (i.e., time slicing is not used).
I/O refreshing is always performed after program execution.
Peripheral Servicing
Peripheral servicing involves servicing non-scheduled events for external
devices. This includes both events from external devices and service requests
to external devices.
Most peripheral servicing involves FINS commands. The specific amount of
time set in the system is allocated to each type of servicing and executed
every cycle. If all servicing cannot be completed within the allocated time, the
remaining servicing is performed the next cycle.
Units
Max. data exchange
Data exchange area
CPU Unit built-in I/O
2 input words
2 output words
I/O Bit Area
CPM1A Expansion Units and Expansion I/O Units
Fixed depending on Units I/O Bit Area
CJ-series Spe-
cial I/O Units
Words allocated in CIO Area
10 words/Unit (Depends
on the Unit.)
Special I/O Unit Area
Unit- specific
data
CompoBus/S
Master Unit
Depends on the Unit.
Remote I/O Communications Area
CJ-series CPU
Bus Units
Words allocated in CIO Area
25 words/Unit
CPU Bus Unit Area in CIO Area
Words allocated in DM Area
100 words/Unit
CPU Bus Unit Area in DM Area
Unit-specific
data
Controller Link
Unit
Depends on the Unit.
Words set for data links (for either fixed
or user-set allocations)
DeviceNet Unit
Depends on the Unit.
Words set for remote I/O communica-
tions (for either fixed or user-set alloca-
tions)
Serial Commu-
nications Unit
Depends on the protocol
macros.
Communications data set for protocol
macros
Ethernet Unit
Depends on the Unit.
Communications data for socket ser-
vices initiated by specific control bit
operations.
Service
Description
Event servicing for CJ-series
Special I/O Units
• Non-scheduled servicing for FINS commands from
CJ-series Special I/O Units and CJ-series CPU Bus
Units
• Non-scheduled servicing for FINS commands from
the CPU Unit to the above Units.
Event servicing for CJ-series
CPU Bus Units
USB port servicing
• Non-scheduled servicing for FINS or Host Link
commands received via a USB port or serial port
from the CX-Programmer, PTs, or host computers
(e.g., requests for program transfers, monitoring,
forced-set/reset operations, or online editing)
• Non-scheduled servicing from the CPU Unit trans-
mitted from a serial port (non-solicited communica-
tions)
Communications port servic-
ing
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...