KEYENCE Visual KV Series - Manual (Page 161)

2.4 Instruction Details
1
2
3-137 Chapter 2 Instructions
Example
Description
• Arithmetic instructions have two instruction types: differentiation type and every-
scan type.
• The differentiation type instruction is executed only at the rising edge of input
relay 0000.
• The every-scan type instruction is executed every scan time while input relay
0000 is ON.
Timing diagram
• Instructions with the DIFFERENTIATION function are as follows:
LDA, SAT, CMP, ADD, SUB, MUL, DIV, ANDA, ORA, EORA, SRA, SLA, RRA,
RLA, COM, INC, DEC, MPX, DMX, TBCD, TBIN, ASC, RASC, ROOT
Note:
In the top program, an INC instruction is
executed every scan time, incrementing
the contents of DM0000 by one, while
input relay 0000 is ON.
In the middle program, an INC instruc-
tion is executed and the contents of
DM0000 is incremented only when input
relay 0000 is turned from OFF to ON.
The bottom program uses the
every-scan type instruction which
performs the same operation as the
differentiation type instruction.
Operands
Key operation
@xxxx: Differentiation
Executes instruction only at rising edge of
input to input relay.
@
#,$
FUN xxxx
0000 0000 DM0000
INC
DM0000
INC
Every-scan type instruction Differentiation type instruction
ON
OFF
0000
INC
ON
OFF
0000
INC
Executed only once at the rising
edge of input relay 0000.
Differentiation type instruction
Executed Stopped Stopped Stopped
Every-scan type instruction
Stopped
0000 DM0000
INC
0000 DM0000
INC
0000 1000 DM0000
INC
1000
DIFU
@
#,$
FUN Function No. ENT
R-SRCH
:
@xxxx
KVNKA Chap 02_4cP.p65 08.3.11, 0:02 PM 137