59
In this example, 0200 will be turned ON 30 minutes after 0000 goes ON.
TIM can also be combined with CNT or CNT can be used to count SR area
clock pulse bits to produce longer timers. An example is provided in
5–11–4
Counter – CNT
.
TIM can be combined with KEEP(11) to delay turning a bit ON and OFF in
reference to a desired execution condition. KEEP(11) is described in
5–6–3
Keep – KEEP(11)
.
To create delays, the Completion Flags for two timers are used to determine
the execution conditions for setting and resetting the bit designated for
KEEP(11). The bit whose manipulation is to be delayed is used in KEEP(11).
Turning ON and OFF the bit designated for KEEP(11) is thus delayed by the
SV for the two timers. The two SV could naturally be the same if desired.
In the following example, 0500 would be turned ON 5.0 seconds after 0000
goes ON and then turned OFF 3.0 seconds after 0000 goes OFF. It is neces-
sary to use both 0500 and 0000 to determine the execution condition for TIM
02; 0000 in an inverse condition is necessary to reset TIM 02 when 0000
goes ON and 0500 is necessary to activate TIM 02 when 0000 goes OFF,
setting 0500 by resetting TIM 01.
0000
0500 0000
TIM 01
TIM 02
TIM 01
TIM 02
KEEP
0500
S
R
5.0 s
3.0 s
The length of time that a bit is kept ON or OFF can be controlled by combin-
ing TIM with OUT or OUT NOT. The following diagram demonstrates how
this is possible. In this example, 0204 would remain ON for 1.5 seconds after
0000 goes ON regardless of the time 0000 stays ON. This is achieved by
using 1000, activated by 0000, to turn ON 0204 . When TIM 01 comes ON
(i.e., when the SV of TIM 01 has expired), 0204 will be turned OFF through
TIM 01 (i.e., TIM 01 will turn ON for an inverse condition, creating an OFF
execution condition for OUT 0204). TIM 01 will also turn OFF 1000 the next
scan, resetting the one-shot.
Example 3:
ON/OFF Delays
Example 4:
One-shot Bits
Timer and Counter Instructions Section 5–11
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