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139
Timers and Counters
Section 4-9
The refresh method for counter PVs can be set from the CX-Programmer to
either BCD or binary. (Refer to the previous page).
It is not recommended to use the same counter number in two counter
instructions because the counters will not operate correctly if they are count-
ing simultaneously. If two or more counter instructions use the same counter
number, an error will be generated during the program check, but the counters
will operate as long as the instructions are not executed in the same cycle.
The following table shows when counter PVs and Completion Flags will be
reset.
Forcing Bit Status
Counter Completion Flags can be force-set and force-reset.
Counter PVs cannot be force-set or force-reset, although the PVs can be
refreshed indirectly by force-setting/resetting the Completion Flag.
Restrictions
There are no restrictions in the order of using counter numbers or in the num-
ber of N.C. or N.O. conditions that can be programmed. Counter PVs can be
read as word data and used in programming.
Instruction name
Effect on PV and Completion Flag
Reset
Mode
change
PLC startup
Reset Input
CNR(545)/CN
RX(547)
Interlocks
(IL-ILC)
COUNTER:
CNT/CNTX(546)
PV
→
0
Flag
→
OFF
Maintained
Maintained
Reset
Reset
Maintained
REVERSIBLE
COUNTER:
CNTR(012)/CNTRX(548)
COUNTER WAIT:
CNTW(814)/CNTWX(818)
Содержание CP1L - 12-2007
Страница 3: ...iv...
Страница 9: ...x...
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...