Visual kv series – KEYENCE Visual KV Series User Manual
Page 254
4.5 Special Functions Using High-speed Counters
3-230
Visual KV
Series
4
Chapter 4 High-speed Counters
■ Program for speed control
The following ladder program illustrates speed control using the specified frequency
pulse output function.
Control is started when input relay 0000 turns ON. The operation is slowed down
and then stopped when input relay 0001 turns ON.
By specifying the speed (Hz) in data memory DM0000, the program controls the
speed with a start-up speed of 16 Hz and an acceleration speed of 100 Hz/100 ms.
1) Sets "16" as the preset speed at the rising edge of input relay 0000. Turns ON
special utility relay 2306 to start the specified frequency pulse output. Then, turns
ON the operating flag.
2) Turns ON slow-down-stop flag 1101 at the rising edge of input 0001.
3) When the slow-down-stop flag turns ON, sets the preset speed to "16". When the
output frequency reaches "16", turns OFF the operation start flag, operating flag,
and slow-down-stop flag.
4) Activates a 100-ms flicker circuit while the operating flag turns ON.
5) Compares the current speed and preset speed every 100 ms. Executes subrou-
tine 0 when the preset speed is faster, and executes subroutine 1 when the
preset speed is slower.
6) Output relay 0500 turns ON when a setting error occurs.
7) Acceleration process. When the current speed is slower than the preset speed by
less than "100", the speed is accelerated by the difference. When the difference
is "100" or more, the speed is accelerated by "100".
8) Deceleration process. When the current speed is faster than the preset speed by
less than "100", the speed is decelerated by the difference. When the difference
is "100" or more, the speed is decelerated by "100".
0003
0005
TM02
ADD
#00016
LDA
DM1936
LDA
DM0000
CMP
DM0000
STA
DM1936
CMP
DM1936
STA
TM02
STA
DM1936
LDA
0001
2010
2307
0002
0006
END
SBN
00
SBN
01
RET
0004
0500
1000
DIFU
0000
1000
1100
SET
1001
DIFU
#00100
T
000
S
0001
1001
1101
SET
1101
DM0000
LDA
DM1936
SUB
#00100
CMP
2011
#00100
ADD
DM1936
STA
DM1936
LDA
2011
2002
TM02
SUB
DM1936
STA
TM02
STA
DM1936
LDA
RET
ENDH
DM1936
LDA
DM0000
SUB
#00100
CMP
2011
#00100
SUB
DM1936
STA
DM1936
LDA
2011
2002
1100
00
CALL
T000
0007
0008
0011
0013
0009
0010
0014
0012
0015
0016
0017
2009
01
CALL
2011
T000
1101
RES
1100
RES
2306
RES
2306
SET
1)
2)
3)
4)
5)
6)
7)
8)
#00016
LDA
DM1936
STA
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