AutomationDirect DL105, Руководство пользователя

Страница: 222 / 350

Standard
RLL
Instructions
5--62
Standard RLL Instructions
Math Instructions
DL105 PLC User Manual, 3rd Edition
SUB
A aaa
Subtract is a 16 bit instruction that
subtracts the BCD value (Aaaa) in a
V--memory location from the BCD value
in the lower 16 bits of the accumulator.
The result resides in the accumulator.
Operand Data Type DL130 Range
A aaa
V--memory V All (See page 4--29)
Discrete Bit Flags Description
SP63 On when the result of the instruction causes the value in the accumulator
to be zero.
SP64 On when the 16 bit subtraction instruction results in a borrow.
SP65 On when the 32 bit subtraction instruction results in a borrow.
SP70 On anytime the value in the accumulator is negative.
SP75 On when a BCD instruction is executed and a NON--BCD number was
encountered.
NOTE: The status flags are only valid until another instruction that uses the same
flags is executed.
In the following example, when X1 is on, the value in V2000 will be loaded into the
accumulator using the Load instruction. The value in V2006 is subtracted from the
value in the accumulator using the Subtract instruction. The value in the accumulator
is copied to V2010 using the Out instruction.
Direct SOFT
Handheld Programmer Keystrokes
LD
V2000
X1
Load the value in V2000 into
the lower 16 bits of the
accumulator
SUB
V2006
Subtract the value in V2006
from the value in the lower
16 bits of the accumulator
OUT
V2010
Copy the value in the lower
16 bits of the accumulator to
V2010
V2010
0 2
1
(V2006)
(Accumulator)
2
0
0
y
V2000
4 7 5
8 8 3
0 0 0 4 7 5
5 9 2
Acc.
8 8 3
The unused accumulator
bits are set to zero
SHFT
ANDST
L
3
D
STR
$
SHFT SHFT
AND
V
2
C
0
A
0
A
ENT
6
G
OUT
GX
SHFT
AND
V
2
C
0
A
1
B
0
A
ENT
RST
S
ISG
U
1
B
1
B
ENT
2
C
0
A
0
A
0
A
ENT
Subtract
(SUB)