AutomationDirect DL205 - Page 320

DL205 User Manual, 4th Edition, Rev. D
5-96
Chapter 5: Standard RLL Instructions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A
B
C
D
Multiply Real (MULR)
The Multiply Real instruction multiplies a real number in
the accumulator with either a real constant or a real number
occupying two consecutive V-memory locations. The result
resides in the accumulator. Both numbers must be Real data
type (IEEE floating point format).
NOTE: Status flags are valid only until another instruction uses the same flag.
NOTE: The current HPP does not support real number entry with automatic conversion to the 32-bit IEEE
format. You must use DirectSOFT for this feature.
MULR
A aaa
DirectSOFT
LDR
R7.0
X1
Load thereal number 7.0
into theaccumulator.
MULR
R 15.0
Multiply theaccumulator
contentsbythe real number
15.0
0 0000000000000000 100001011010010
8 421842184218421
8 421842184218421
Acc.
42D2 0000
V1400V1401
Real Value
Copy theresultinthe accumulator
to V1400 and V1401.
OUTD
V1400
Implies2(exp 6)
133 -- 127 =6
(Hex number)
Sign Bit
40E00000
000040E0
(MULR)
(Accumulator)
4170 0 000X
000042D2
Acc.
7
(decimal)
x15
105
1.101001 x2(exp 6) =1101001. binary= 105 decimal128 +4+1= 133
Exponent (8 bits)
Mantissa (23 bits)




230
240
250-1
260
Discrete Bit Flags Description
SP63 On when the result of the instruction causes the value in the accumulator to be zero
SP70 On anytime the value in the accumulator is negative
SP71 On anytime the V-memory specified by a pointer (P) is not valid
SP72 On anytime the value in the accumulator is an invalid floating point number
SP73 On when a signed addition or subtraction results in an incorrect sign bit
SP74 On anytime a floating point math operation results in an underflow error
SP75 On when a real number instruction is executed and a non-real number was encountered
Operand Data Type DL250-1 Range DL260 Range
A aaa aaa
V-memory V All. (See page 3-55) All. (See page 3-56)
Pointer P All V-memory (See page 3-55) All V-memory (See page 3-56)
Constant R
-3.402823E+038 to
+ 3.402823E+038
-3.402823E+038 to
+ 3.402823E+038
DS Used
HPP N/A