Automationdirect.com DirectLOGIC DL205 Series User Manual

DL205 User Manual, 4th Edition, Rev. B
5–64
Chapter 5: Standard RLL Instructions - Accumulator/Stack Load and Output Data
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9
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14
A
B
C
D
Load Real Number (LDR)
The Load Real Number instruction loads a real number
contained in two consecutive V-memory locations, or an 8-
digit constant into the accumulator.
DirectSOFT allows you to enter real numbers directly,
by using the leading “R” to indicate a real number
entry. You can enter a constant such as Pi, shown in
the example to the right. To enter negative numbers,
use a minus (–) after the “R”.
For very large numbers or very small numbers, you can
use exponential notation. The number to the right is
5.3 million. The OUTD instruction stores it in V1400
and V1401.
These real numbers are in the IEEE 32-bit floating point format, so they occupy two V-
memory locations, regardless of how big or small the number may be! If you view a stored real
number in hex, binary, or even BCD, the number shown will be very difficult to decipher.
Just like all other number types, you must keep track of real number locations in memory, so
they can be read with the proper instructions later.
The previous example above stored a real number in V1400
and V1401. Suppose that now we want to retrieve that
number. Just use the Load Real with the V data type, as
shown to the right. Next we could perform real math on it,
or convert it to a binary number.
1
B
ENT
ENT
2
C
H
andheld Programmer Keystrokes
STR
$
SHFT
ANDST
L
3
D
SHFT
JMP
K
1
B
ENT
SHFT
ANDST
L
3
D
RST
S
S
ET
X
SHFT
4
E
TMR
N
3
D
ENT
SHFT
3
D
ANDST
L
1
B
ANDST
L
2
C
ENT
SHFT
TMR
N
2
C
INST#
O
TMR
N
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D
3
D
3
D
3
D
ENT
S
HFT
TMR
N
2
C
INST#
O
TMR
N
3
D
3
D
E
NT
2
C
2
C
SHFT
TMR
N
2
C
INST#
O
TMR
N
ENT
4
E
5
F
4
E
9
J
OUT
GX
SHFT
AND
V
2
C
0
A
0
A
ENT
0
A
A aaa
LDR
ý
ý
þ
þ
230
240
250-1
260
R3.14159
LDR
R5.3E6
LDR
V1400
OUTD
V1400
LDR
Operand Data Type DL250-1 Range DL260 Range
A aaa aaa
V-memory V All. See memory map All. See memory map
Pointer P All V-memory. See memory map All V-memory. See memory map
Real Constants R
-3.402823E+038 to
+3.402823E+038
-3.402823E+038 to
+3.402823E+038
DS Used
HPP N/A

Automationdirect.com DirectLOGIC DL205 Series Specifications

General

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