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79
Computing the Cycle Time
Section 2-7
5: Peripheral Servicing
2-7-3
Functions Related to the Cycle Time
Minimum Cycle Time
Set the minimum cycle time to a non-zero value to eliminate inconsistencies in
I/O responses. A minimum cycle time can be set in the PLC Setup between 1
and 32,000 ms in 1-ms increments.
This setting is effective only when the actual cycle time is shorter than the
minimum cycle time setting. If the actual cycle time is longer than the mini-
mum cycle time setting, the actual cycle time will remain unchanged.
PLC Setup
Details
Processing time and fluctuation cause
Services USB port.
If a uniform peripheral servicing time hasn’t been set in the PLC Setup for
this servicing, 8% of the previous cycle’s cycle time (calculated in step (3))
will be allowed for peripheral servicing.
If a uniform peripheral servicing time has been set in the PLC Setup, servic-
ing will be performed for the set time. Servicing will be performed for at
least 0.1 ms, however, whether the peripheral servicing time is set or not.
If the ports are not connected, the servicing time is 0 ms.
Services serial ports
Services communications ports.
If a uniform peripheral servicing time hasn’t been set in the PLC Setup for
this servicing, 8% of the previous cycle’s cycle time (calculated in step (3))
will be allowed for peripheral servicing.
If a uniform peripheral servicing time has been set in the PLC Setup, servic-
ing will be performed for the set time. Servicing will be performed for at
least 0.1 ms, however, whether the peripheral servicing time is set or not.
If no communications ports are used, the servicing time is 0 ms.
Services built-in flash memory access.
If a uniform peripheral servicing time hasn’t been set in the PLC Setup for
this servicing, 8% of the previous cycle’s cycle time (calculated in step (3))
will be allowed for peripheral servicing.
If a uniform peripheral servicing time has been set in the PLC Setup, servic-
ing will be performed for the set time. Servicing will be performed for at
least 0.1 ms, however, whether the peripheral servicing time is set or not.
If there is no access, the servicing time is 0 ms.
Serves Memory Cassette access.
Minimum cycle time
(effective)
Minimum cycle time
(effective)
Minimum cycle time
(effective)
Actual cycle
time
Actual cycle
time
Actual cycle
time
Minimum cycle time
Actual cycle
time
Minimum cycle time
Actual cycle
time
Minimum cycle time (effective)
Actual cycle
time
Name
Settings
Default
Minimum cycle time
0000 to 7D00 hex
(1 to 32,000 ms in 1-ms incre-
ments)
0000 hex: Variable cycle time
Содержание CP1L - 12-2007
Страница 3: ...iv...
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Страница 13: ...xiv TABLE OF CONTENTS...
Страница 21: ...xxii...
Страница 33: ...xxxiv Conformance to EC Directives 6...
Страница 65: ...32 Function Blocks Section 1 5...
Страница 428: ...395 Clock Section 6 9...
Страница 429: ...396 Clock Section 6 9...
Страница 523: ...488 Troubleshooting Unit Errors Section 9 4...
Страница 531: ...496 Replacing User serviceable Parts Section 10 2...
Страница 563: ...528 Auxiliary Area Allocations by Function Appendix C...
Страница 611: ...576 Auxiliary Area Allocations by Address Appendix D...
Страница 638: ...603 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 639: ...604 Connections to Serial Communications Option Boards Appendix F...
Страница 669: ...634 Index...
Страница 671: ...636 Revision History...