Delta VFD11AMS21AFSHA, User Manual

Page: 386 / 445

Chapter 16 PLC Function Applications

MS300
(High Speed Model)
16-55
API
SUB
S1 S2 D BIN subtraction
21
D P
Bit device Word device
16-bit command (7 STEP)
SUB Continuous
execution type
SUBP Pulse
execution type
32-bit command (13 STEP)
DSUB
Continuous
execution type
DSUBP
Pulse
execution type
Flag signal: M1020 Zero flag
M1021 Borrow flag
M1022 Carry flag
Please refer to the following
supplementary explanation
X Y M K H KnX KnY KnM T C D
S1 ＊ ＊ ＊ ＊ ＊ ＊ ＊ ＊
S2
＊ ＊ ＊ ＊ ＊ ＊ ＊ ＊
D
＊ ＊ ＊ ＊ ＊
Notes on operand usage: none

S1
: Minuend.
S2
: Subtrahend.
D
: Difference.

Using two data sources: The result of subtraction of
S1
and
S2
using the
BIN method is stored in
D
.
 The highest bit of any data is symbolized as bit 0 indicating (positive) 1 indicating
(negative), enabling the use of algebraic subtraction operations.
 Flag changes connected with subtraction.
1. When calculation results are 0, the zero flag M1020 will be On.
2. When calculation results are less than –32,768, the borrow flag M1021 will be
On.
3. When calculation results are greater than 32,767, the carry flag M1022 will be
On.
 16-bit BIN subtraction: When X0=On, the content of D10 is subtracted from the
content of D0, and the difference is stored in D20.
X0
D0 D10 D20
SUB