146
Bits can be programmed to turn ON and OFF at regular intervals while a desig-
nated execution condition is ON by using TIM twice. One TIM functions to turn
ON and OFF a specified bit, i.e., the Completion Flag of this TIM turns the speci-
fied bit ON and OFF. The other TIM functions to control the operation of the first
TIM, i.e., when the first TIM’s Completion Flag goes ON, the second TIM is
started and when the second TIM’s Completion Flag goes ON, the first TIM is
started.
000000
000205
1.5 s1.0 s 1.5 s1.0 s
Address Instruction
00000 LD 000000
00001 AND T0002
00002 TIM 0001
#0010
00003 LD 000205
00004 TIM 0002
#0015
00005 LD T0001
00006 OUT 000205
Operands
1.5 s
1.0 s
0000
00 T0002
000205
TIM 0002 #0015
TIM 0001 #0010
T0001
0002
05
A simpler but less flexible method of creating a flicker bit is to AND one of the
Auxiliary Area clock pulse bits with the execution condition that is to be ON when
the flicker bit is operating. Although this method does not use TIM, it is included
here for comparison. This method is more limited because the ON and OFF
times must be the same and they depend on the clock pulse bits available in the
Auxiliary Area.
In the following example the 1-second clock pulse is used (A50102) so that
000206 would be turned ON and OFF every second, i.e., it would be ON for 0.5
seconds and OFF for 0.5 seconds. Precise timing and the initial status of 000206
would depend on the status of the clock pulse when 000000 goes ON.
Address Instruction
00000 LD 000000
00001 AND A50102
00002 OUT 000206
Operands
0000
00
A501
02
0002
06
5-13-2 HIGH-SPEED TIMER: TIMH(015)
(015)
TIMH N S
S: Set value CIO, G, A, T, C, #, DM, DR, IR
*Refer to page 141 for details on indirectly addressing timers.
N: Timer number #
Operand Data AreasLadder Symbol
Description TIMH(015) operates in the same way as TIM except that TIMH measures in
units of 0.01 second.
The cycle time affects TIMH(015) accuracy if T0128 through T0511 in the CV500
or CVM1-CPU01-EV2 or T0256 through T1023 in the CV1000, CV2000, or
CVM1-CPU11/21-EV2 are used. If the cycle time is longer than 10 ms, use timer
numbers T0000 through T0127 in the CV500 or CVM1-CPU01-EV2 or T0000
through T0255 in the CV1000, CV2000, or CVM1-CPU11/21-EV2.
High-speed timer PVs are updated when the TIMH instruction is executed, dur-
ing cyclic refreshing, or interrupt refreshing. Interrupt refreshing updates active
high-speed timers every 10 ms. Refer to
6-2 Cycle Time
for details.
Example 5:
Flicker Bits
Timer and Counter Instructions Section 5-13
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