DL06 Micro PLC User Manual, 3rd Edition, Rev. E
5-111
Chapter 5: Standard RLL Instructions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A
B
C
D
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
into the accumulator onto the accumulator stack. The BCD value in the first level of the
accumulator stack is subtracted from the BCD 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.
S UBS
St
a
DirectSOFT32 Display
LDD
V1400
X1
Load the value in V1400 and
V1401 into the accumulator
LDD
V1420
Load the value in V1420 and
V1421 into the accumulator
OUTD
V1500
Copy the value in the
accumulator to V1500
and V1501
X X X
X X X X X
Level 1
X X X
X X X X X
Level 2
X X X
X X X X X
Level 3
X X X
X X X X X
Level 4
X X X
X X X X X
Level 5
X X X
X X X X X
Level 6
X X X
X X X X X
Level 7
X X X
X X X X X
Level 8
0
0 1
7 2
0 5
6
Level 1
X X X
X X X X X
Level 2
X X X
X X X X X
Level 3
X X X
X X X X X
Level 4
X X X
X X X X X
Level 5
X X X
X X X X X
Level 6
X X X
X X X X X
Level 7
X X X
X X X X X
Level 8
SUBS
Subtract the value in the first
level of the accumulator
stack from the value in the
accumulator
Acc.
V1400
2 0
5
6
0
0 1
7
2
0
5
6
V1401
0
0 1
7
Acc.
V1420
5 0
2
6
0
0 3
9
5
0
2
6
V1421
0
0 3
9
Accumulator stack
after 1st LDD
Accumulator stack
after 2nd LDD
Acc. 0
0 2
2
2
9
7
0
0
0 2
2
2
9
7
0
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
RST
S
3
D
RST
S
SHFT
V1501
V1500
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.
SP73
On when a signed addition or subtraction results in an incorrect sign bit.
SP75
On when a BCD instruction is executed and a NON-BCD number was encountered.
DS
Used
HPP Used
Direct
SOFT
Subtract Top of Stack (SUBS)
Subtract Top of Stack is a 32-bit instruction that subtracts
the BCD value in the first level of the accumulator stack from
the BCD 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 values are moved up one level.
