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Timer and Counter Instructions Section 3-5
Operand Specifications
Description When the timer input is OFF, the timer specified by N is reset, i.e., the timer’s
PV is reset to the SV and its Completion Flag is turned OFF.
When the timer input goes from OFF to ON, TMHH(540)/TMHHX(552) starts
decrementing the PV. The PV will continue timing down as long as the timer
input remains ON and the timer’s Completion Flag will be turned ON when the
PV reaches 0000.
The status of the timer’s PV and Completion Flag will be maintained after the
timer times out. To restart the timer, the timer input must be turned OFF and
then ON again or the timer’s PV must be changed to a non-zero value (by
MOV(021), for example).
Flags
Precautions Timer numbers are shared by the TIM, TIMX(550), TIMH(015), TIMHX(551),
TMHH(540), TMHHX(552), TTIM(087), TTIMX(555), TIMW(813),
TIMWX(816), TMHW(815), and TMHWX(817) instructions. If two timers share
the same timer number, but are not used simultaneously, a duplication error
will be generated when the program is checked, but the timers will operate
normally. Timers which share the same timer number will not operate properly
if they are used simultaneously.
Area N S
CIO Area --- CIO 0 to CIO 6143
Work Area --- W0 to W511
Holding Bit Area --- H0 to H511
Auxiliary Bit Area --- A0 to A959
Timer Area 0000 to 0015 (decimal) T0000 to T4095
Counter Area --- C0000 to C4095
DM Area --- D0 to D32767
Indirect DM addresses
in binary
--- @ D0 to @ D32767
Indirect DM addresses
in BCD
--- *D0 to *D32767
Constants --- BCD:
#0000 to 9999 (BCD)
“&” cannot be used.
Binary:
&0 to &65535 (decimal)
#0000 to #FFFF (hex)
Data Registers --- DR0 to DR15
Index Registers --- ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
Name Label Operation
Error Flag ER ON if N is indirectly addressed through an Index Register
but the address in the Index Register is not the PV
address of a timer.
ON if in BCD mode and S does not contain BCD data.
OFF in all other cases.
Equals Flag = OFF or unchanged
Negative Flag N OFF or unchanged
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