Kv -300 – KEYENCE Visual KV Series User Manual
Page 298
6.1 Interrupt Instructions
KV
-300
KV-10/80
3-274
6
Chapter 6 Interrupts, High-speed Counters, Positioning Control
INT / RETI
2008
1
EI
2203
2002
2002
CTH1
0005
END
INT
CTC2
RETI
2
4
0000
5
3
CTH1
#05000
CTC2
SET
2813
0501
0501
SET
RES
SET
RES
ENDH
■ Initial setting
•
When the operation is started, EI instruction enables interrupts.
•
Special utility relays No. 2200 through 2215 are turned OFF. Turning OFF 2203
disables CTC2 from resetting the CTH1 current value to 0.
•
Turning OFF 2206 allows interrupt to be generated at the rising edge of INT0003.
•
The value of DM0000 is reset to "0".
•
Turning ON special utility relay 2813 changes the input time constant to 10 µs.
•
1.0-µs internal clock pulses are counted using CTH1.
•
INT instruction with 0003 as the operand allows interrupts to be executed.
•
When interrupt is generated for the first time, 2206 is OFF. Therefore, program in
rung (a) is executed. Then, KEEP turns 2206 ON.
•
When interrupt is generated for the second time, 2206 is ON. Therefore, program
in rung (b) is executed to calculate the following:
(TM30 at 2nd execution) - (TM30 at 1st execution) = pulse width (unit: 1.0 µs)
The result is stored in DM0000.
Example 3
Interrupt by CTC
Pulses input to 0005 are counted. 0501 is turned ON when the number of pulses
reaches 5,000.
Coding
Line No.
Instruction
Operand
Line No.
Instruction
Operand
0000
LD
2008
0010
LD
2002
0001
EI
0011
CTH
1 0005
0002
CON
0012
LD
0000
0003
SET
2203
0013
RES
0501
0004
CON
0014
END
0005
RES
CTH1
0015
INT
CTC2
0006
CON
0016
LD
2002
0007
CTC
2 #05000
0017
SET
0501
0008
CON
0018
RETI
0009
SET
2813
0019
ENDH
KVNKA Chap 06.p65
08.3.11, 0:10 PM
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