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138
Timers and Counters
Section 4-9
The following table shows when timers will be reset or maintained.
Note
1.
If the IOM Hold Bit (A500.12) is ON, the PV and Completion Flag will be
retained when a fatal error occurs (including execution of FALS instruc-
tions) or the operating mode is changed from PROGRAM mode to RUN or
MONITOR mode or vice-versa. The PV and Completion Flag will be
cleared when power is cycled.
2.
If the IOM Hold Bit (A50012) is ON and the PLC Setup’s
IOM Hold Bit Sta-
tus at Startup
setting is set to protect the IOM Hold Bit, the PV and Com-
pletion Flag will be retained when the PLC’s power is cycled.
3.
Since the TIML(542), TIMLX(553), MTIM(543), and MTIMX(554) instruc-
tions do not use timer numbers, they are reset under different conditions.
Refer to the descriptions of these instructions for details.
4.
The present value of TIM, TIMX(550), TIMH(015), TIMHX(551), TM-
HH(540), TMHHX(552), TIMW(813), TIMWX(816), TMHW(815) and TMH-
WX(817) timers programmed with timer numbers 0000 to 2047 will be
updated even when jumped between JMP and JME instructions or when
in a task that is on standby. The present value of timers programmed with
timer numbers 2048 to 4095 will be held when jumped or when in a task
that is on standby.
Forcing Bit Status
Timer Completion Flags can be force-set and force-reset.
Timer 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 timer numbers or in the number
of N.C. or N.O. conditions that can be programmed. Timer PVs can be read as
word data and used in programming.
4-9-2
Counter Area (C)
The 4,096 counter numbers (C0000 to C4095) are shared by the CNT,
CNTX(546), CNTR(012), CNTRX(548), CNTW(814), and CNTWX(818)
instructions. Counter Completion Flags and present values (PVs) for these
instructions are accessed with the counter numbers.
When a counter number is used in an operand that requires bit data, the
counter number accesses the Completion Flag of the counter. When a
counter number is used in an operand that requires word data, the counter
number accesses the PV of the counter.
Instruction name
Effect on PV and Completion Flag
Operation in
Jumps and Interlocks
Mode change
1
PLC start-up
2
CNR(545)/CN
RX(547)
Jumps
(JMP-JME) or
Tasks on
standby
4
Interlocks
(IL-ILC)
TIMER: TIM/TIMX(550)
PV
→
0
Flag
→
OFF
PV
→
0
Flag
→
OFF
PV
→
9999
Flag
→
OFF
PVs refreshed in
operating timers
PV
→
SV
(Reset to SV.)
Flag
→
OFF
HIGH-SPEED TIMER:
TIMH(015)/TIMHX(551)
ONE-MS TIMER:
TMHH(540)/TMHHX(552)
ACCUMULATIVE TIMER:
TTIM(087)/TTIMX(555)
PV Maintained
PV Maintained
TIMER WAIT:
TIMW(813)TIMWX(816)
PVs refreshed in
operating timers
---
HIGH-SPEED TIMER WAIT:
TMHW(815)/TMHWX(817)
---
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...