145
In the following example, 000500 would be turned ON 5.0 seconds after 000000
goes ON and then turned OFF 3.0 seconds after 000000 goes OFF. It is neces-
sary to use both 000500 and 000000 to determine the execution condition for
T0002; 000000 in a normally closed condition is necessary to reset T0002 when
000000 goes ON and 000500 is necessary to activate T0002 (when 000000 is
OFF).
000000
000500
5.0 s 3.0 s
Address Instruction
00000 LD 000000
00001 TIM 0001
#0050
00002 LD 000500
00003 AND NOT 000000
00004 TIM 0002
#0030
00005 LD T0001
00006 LD T0002
00007 KEEP(011) 000500
5.0 s
3.0 s
Operands
(011)
KEEP 000500
0000
00
TIM 0001 #0050
0005
00
TIM 0002 #0030
0000
00
T0001
T0002
S
R
The length of time that a bit is kept ON or OFF can be controlled by combining
TIM with OUT or OUT NOT. The following diagram demonstrates how this is
possible. In this example, 000204 would remain ON for 1.5 seconds after
000000 goes ON regardless of the time 000000 stays ON. This is achieved by
using 001000 as a self-maintaining bit activated by 000000 and turning ON
000204 through it. When T0001 comes ON (i.e., when the SV of T0001 has ex-
pired), 000204 will be turned OFF through T0001 (i.e., T0001 will turn ON which,
as a normally closed condition, creates an OFF execution condition for OUT
000204).
00000 LD 001000
00001 AND NOT 010000
00002 OR 000000
00003 OUT 001000
00004 LD 001000
00005 TIM 0001
#0015
00006 LD T0001
00007 OUT 010000
00008 LD 001000
00009 AND NOT 010000
00010 OUT 000204
000000
000204
1.5 s 1.5 s
Address Instruction Operands
1.5 s
0010
00
0000
00
0010
00
0010
00
0010
00
0002
04
TIM 0001 #0015
0100
T0001 00
0100
00
0100
00
Example 4:
One-Shot Bits
Timer and Counter Instructions Section 5-13
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