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95
Computing the Cycle Time
Section 2-7
CJ-series Special I/O Unit I/O Refresh Times (Examples)
Increase in Cycle Time Caused by CPU Bus Units
Note
The refresh time for I/O built into the CPU Unit is included in the overseeing
time.
When pulse output ports 2 and 3 are used, the cycle time increases in propor-
tion to the output frequency.
Cycle time rate of increase (%) from pulse output ports 2 and 3 = Output fre-
quency (kHz)
×
0.1.
Examples:
30 kHz: Approx. 3%
100 kHz: Approx. 10%
2-7-5
Cycle Time Calculation Example
The following example shows the method used to calculate the cycle time
when CPM1A Expansion I/O Units only are connected to a CP1H CPU Unit.
Name
Model
I/O refresh time per Unit
CompoBus/S Mas-
ter Unit
CJ1W-SRM21
Allocated one unit number
0.15 ms
Allocates two unit numbers
0.17 ms
Analog Input Unit
CJ1W-AD041/081(-V1)
0.16 ms
Analog Output Unit CJ1W-DA021/041/08V
0.16 ms
Analog I/O Unit
CJ1W-MAD42
0.167 ms
Temperature Con-
troller Unit
CJ1W-TC
@@@
0.367 ms
Name
Model
Time
Remarks
Controller Link
Unit
CJ1W-CLK21-V1 0.15 ms
There will be an increase of 1.0 ms + 0.7
µ
s
×
number of
data link words.
There will be an additional increase of the event execution
times when message services are used.
Serial Commu-
nications Unit
CJ1W-SCU41
CJ1W-SCU21
0.24 ms
There will be an increase of up to the following time when a
protocol macro is executed:
0.7
µ
s
×
maximum number of data words sent or received (0
to 500 words)
There will be an increase of the event execution times when
Host Links or 1:N NT Links are used.
Ethernet Unit
CJ1W-ETN11/21 0.17 ms
If socket services are executed with software switches,
there will be an increase of 1.4
µ
s
×
the number of bytes
sent/received.
There will be an increase of the event execution times when
FINS communications services, socket services for CMND
instructions, or FTP services are performed.
DeviceNet Unit CJ1W-DRM21
0.5 ms + 0.7
µ
s
×
Num-
ber of allocated words
The number of allocated words includes all I/O areas allo-
cated to all slaves, even unused words within the I/O areas.
If message communications are performed, the number of
words for message communications must be added to the
number of allocated words at the left, but only during the
cycles when the message communications are performed.
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...