AutomationDirect DL205 - Page 334

DL205 User Manual, 4th Edition, Rev. D
5-110
Chapter 5: Standard RLL Instructions
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A
B
C
D
Subtract Formatted (SUBF)
Subtract Formatted is a 32-bit instruction that subtracts the
BCD value (Aaaa), which is a range of discrete bits, from the
BCD value in the accumulator. The specified range (Kbbb)
can be 1 to 32 consecutive bits. The result resides in the
accumulator.
NOTE: Status flags are valid only until another instruction uses the same flag.
In the following example, when X6 is on, the value formed by discrete locations X0–X3 is
loaded into the accumulator using the Load Formatted instruction. The value formed by
discrete location C0–C3 is subtracted from the value in the accumulator using the Subtract
Formatted instruction. The value in the lower four bits of the accumulator is copied to Y10–
Y13 using the Out Formatted instruction.




230
240
250-1
260
SUBF A aaa
K bbb
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
LDFX0
K4
X6
SUBF C0
K4
OUTF Y10
K4
Copy thelower 4bitsofthe
accumulatortodiscrete
locations Y10--Y13
010000 0
_
000
0
0 0009
(C0--C3)
(Accumulator)
8
X0X1X2X3
ONOFFOFFON
C0C1C2C3
OFFOFFOFFON
Y10Y11Y12Y13
ONOFFOFFOFF
The unused accumulator
bits areset to zero
ACC.
Handheld Programmer Keystrokes
STR
$
SHFT
ISG
U
1
B
OUT
GX
SHFT
5
F
0
A
4
E
ENT
6
G
ENT
1
B
4
E
0
A
ENT
SHFT
ANDST
L
3
D
0
A
4
E
ENT
5
F
5
F
RST
S
NEXT NEXT NEXTNEXT
SHFT
Load the BCD value represented
by discrete locations X0-X3 into
the accumulator
Subtract the BCD value
represented by C0-C3 from
the value in the accumulator
DirectSOFT
Operand Data Type DL260 Range
A aaa bbb
Inputs X 0-1777 -
Outputs Y 0-1777 -
Control Relays C 0-3777 -
Stage Bits S 0-1777 -
Timer Bits T 0-377 -
Counter Bits CT 0-377 -
Special Relays SP 0-777 -
Global I/O GX/GY 0-3777 -
Constant K - 1-32
DS Used
HPP Used