Eaton ELC-PB, Programming Manual

Page: 237 / 728

E L C P r o g r a m m i n g M a n u a l
F o r m o r e i nf o r m a t i o n v i sit :
w w w. e a t o n . c o m
MN05003003E
3-68
API Mnemonic Operands Function
21 D SUB P
S
1
, S
2
, D
Subtraction
Bit Devices Word devices Program Steps
Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
S
1
* * * * * * * * * * *
S
2
* * * * * * * * * * *
D * * * * * * * *
SUB, SUBP: 7 steps
DSUB, DSUBP: 13 steps
ELC ELCB ELCM
PB PC/PA/PH PV PB PH/PA
32 16 P 32 16 P 32 16 P 32 16 P 32 16 P
Operands:
S
1
: Minuend
S
2
: Subtrahend
D
: Subtraction result
Description:
1. The data contained within the source device,
S
2
is subtracted from the contents of source
device
S
1
. The result of this calculation is stored in the destination device
D
.
2. The most significant bit is the sign. 0 indicates positive and 1 indicates negative. All
calculation is algebraically processed.
3. If operand
S
1
, S
2
, D
use index register F, then only 16-bit instruction is available.
4. Flags: M1020 (Zero flag), M1021 (Borrow flag), M1022 (Carry flag).
Program Example 1:
16-bit instruction:
When X0 = ON, the data in D10 is subtracted from the data in D0 and the result is placed in D20.
X0
SUB D0 D10 D20
(D0)
−
(D10)
=
(D20)
Program Example 2:
32-bit instruction:
When X20 = ON, the data in (D41, D40) is subtracted from the data in (D31, D30) and the result is
placed in (D51, D50). (D30, D40, D50 is the lower 16-bit data, and D31, D41, D51 is the higher
16-bit data)
X20
DSUB
D30 D40 D50
(D31, D30)
−
(D41, D40)
=
(D51, D50)