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There are two ways to achieve timers that operate for longer than 999.9 sec-
onds. One method is to program consecutive timers, with the Completion Flag of
each timer used to activate the next timer. A simple example with two 900.0-sec-
ond (15-minute) timers combined to functionally form a 30-minute timer.
00000
TIM 001
TIM 002
00200
900.0 s
900.0 s
TIM 001
#9000
TIM 002
#9000
Address Instruction Operands
00000 LD 00000
00001 TIM 001
# 9000
00002 LD TIM 001
00003 TIM 002
# 9000
00004 LD TIM 002
00005 OUT 00200
In this example, 00200 will be turned ON 30 minutes after 00000 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
5-14-4 COUNTER
– CNT
.
TIM can be combined with KEEP(11) to delay turning a bit ON and OFF in refer-
ence to a desired execution condition. KEEP(11) is described in
5-9-4 KEEP –
KEEP(11)
.
To create delays, the Completion Flags for two TIM are used to determine the
execution conditions for setting and reset 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 TIM.
The two SV could naturally be the same if desired.
In the following example, 00500 would be turned ON 5.0 seconds after 00000
goes ON and then turned OFF 3.0 seconds after 00000 goes OFF. It is neces-
sary to use both 00500 and 00000 to determine the execution condition for TIM
002; 00000 in an inverse condition is necessary to reset TIM 002 when 00000
goes ON and 00500 is necessary to activate TIM 002 (when 00000 is OFF).
00000
00500 00000
TIM 001
TIM 002
005.0 s
003.0 s
00000
00500
5.0 s
3.0 s
TIM 001
#0050
S
R
KEEP(11)
00500
TIM 002
#0030
Address Instruction Operands
00000 LD 00000
00001 TIM 001
# 0050
00002 LD 00500
00003 AND NOT 00000
00004 TIM 002
# 0030
00005 LD TIM 001
00006 LD TIM 002
00007 KEEP(11) 00500
Example 2:
Extended Timers
Example 3:
ON/OFF Delays
Timer and Counter Instructions Section 5-14