Automationdirect.com DirectLOGIC DL205 Series User Manual

DL205 User Manual, 4th Edition, Rev. B
5–118
Chapter 5: Standard RLL Instructions - Math
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A
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D
Subtract Binary Top of Stack (SUBBS)
Subtract Binary Top of Stack is a 32-bit instruction that
subtracts the binary value in the first level of the accumulator
stack from the binary value in the accumulator. The result
resides in the accumulator. The value in the first level of the
accumulator stack is removed and all stack locations are
moved up one level.
NOTE: Status flags are valid only until another instruction uses the same flag.
In the following example, when X1 is on, the value in V1400 and V1401 will be loaded into
the accumulator using the Load Double instruction. The value in V1420 and V1421 is
loaded into the accumulator using the Load Double instruction, pushing the value previously
loaded in the accumulator onto the accumulator stack. The binary value in the first level of
the accumulator stack is subtracted from the binary value in the accumulator using the
Subtract Stack instruction. The value in the accumulator is copied to V1500 and V1501
using the Out Double instruction.
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ý
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þ
230
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250-1
260
S UBBS
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.
LDD
V1400
X1
Load the value in V1400 and
V1401 i nto the accum ulator
LDD
V1420
Load the value in V1420 and
V1421 i nto the accum ulator
OUTD
V1500
Copy the val ue in the
accum ulator to V1500
and V1501
XXXXXXXXLevel 1
XXXXXXXXLevel 2
XXXXXXXXLevel 3
XXXXXXXXLevel 4
XXXXXXXXLevel 5
XXXXXXXXLevel 6
XXXXXXXXLevel 7
XXXXXXXXLevel 8
001A205BLevel 1
XXXXXXXX
Level 2
XXXXXXXXLevel 3
XXXXXXXX
Level 4
XXXXXXXXLevel 5
XXXXXXXX
Level 6
XXXXXXXXLevel 7
XXXXXXXX
Level 8
SUBBS
Subtr act the binary value i n
the first level of the
accum ulator stack from the
binary value i n the
accum ulator
Acc.
V1400
205B
001A 205 B
V1401
001A
Acc.
V1420
50C6
003A 50C6
V1421
003A
Accum ulator stack
after 1st LDD
Accum ulator stack
after 2nd LDD
Acc.
0020 306 B
0020 306 B
Handheld Programmer Keystrokes
SHFT
ANDST
L
3
D
STR
$
SHFT
ISG
U
1
B
OUT
GX
SHFT
3
D
1
B
5
F
0
A
0
A
ENT
1
B
ENT
1
B
4
E
0
A
0
A
ENT
ENT
SHFT
ANDST
L
3
D
1
B
4
E
2
C
0
A
ENT
3
D
1
B
RST
S
3
D
RST
S
SHFT
V1501
V1500
DirectSOFT
DS Used
HPP Used

Automationdirect.com DirectLOGIC DL205 Series Specifications

General

Brand	Automationdirect.com
Model	DirectLOGIC DL205 Series
Category	Controller
Language	English