Siemens SIMATIC IM 151/CPU Manual page 173

B.25 Floating-Point Math Instructions (32 Bits)
The result of the math instructions is in ACCU1. The execution time of the
instruction depends on the value to be calculated.
In-
Address
struc-
ID
tion
+R – Add 2 real numbers (32 bits)
(ACCU1)=(ACCU2)+(ACCU1)
–R – Subtract 2 real numbers (32 bits)
(ACCU1)=(ACCU2)–(ACCU1)
R
– Multiply 2 real numbers (32 bits)
*
(ACCU1)=(ACCU2)
/R – Divide 2 real numbers (32 bits)
(ACCU1)=(ACCU2)
Status word for: +R, –R,
Instruction depends on:
Instruction controls:
NEGR – Negate real number in ACCU1
ABS – Make absolute value of the real number in
ACCU1
Status word for: NEGR, ABS
Instruction depends on:
Instruction controls:
B.26 Addition of Constants
Addition of integer constants to ACCU1. The indicators are not affected.
In-
Address
struc-
ID
tion
+ i8 Add an 8-bit integer constant
+ i16 Add a 16-bit integer constant
+ i32 Add an 32-bit integer constant
ET 200S Interface Module IM 151/CPU
A5E00058783-01
Description
(ACCU1)
*
(ACCU1)
:
R, /R BR A1
*
–
– Yes
BR A1
–
–
Description
Length
Typical Execution Time in
in
Words
1
1
1
1
A0 OV OS
– – – –
Yes Yes Yes
1
1
A0 OV OS
– – – –
– – – –
Length
Typical Execution Time in
in
Words
1
2
3
Instruction List
s
< 35
< 35
< 35
< 40
OR STA RLO /FC
– – – –
– – – –
0.3
0.3
OR STA RLO /FC
– – – –
– – – –
s
0.3
0.3
0.6
B-39