Instruction list for S7-300 - DCE FEL ČVUT v Praze

List of Instructions List of Instructions
Floating-Point Math (32 Bits)
The result of the math instruction is in ACCU1. The execution time
of the instruction depends on the value to be calculated.
Instruction
Address
Identifier
Description
+R – Add 2 real numbers (32 bits)
(ACCU1)= (ACCU2)+(ACCU1)
–R – Subtract 1 real number from
another (32 bits)
(ACCU1)= (ACCU2)–(ACCU1)
*R – Multiply 1 real number by another
(32 bits)
(ACCU1)=(ACCU2)*(ACCU1)
Length
in
Words
CPU 318–2: ACCU3 and ACCU4 are then transferred to ACCU2
and ACCU3.
312*/313 314/314*
Typical Execution Time in s
315/315-2/
316-2
318-2
1 < 60 < 50 < 35 0.6
1 < 60 < 50 < 35 0.6
1 < 60 < 50 < 35 1.4
/R – Divide 1 real number by another
(32 bits)
(ACCU1)=(ACCU2):(ACCU1)
1 < 60 < 50 < 40 2.1
Status word for: +R, –R, *R, /R BR CC 1 CC 0 OV OS OR STA RLO FC
Instruction depends on: – – – – – – – – –
Instruction affects: – Yes Yes Yes Yes – – – –
NEGR – Negate the real number in ACCU1 1 0.7 1.0 0.3 0.1
ABS – Form the absolute value of the real
number in ACCU1
1 0.7 0.4 0.3 0.1
Status word for: NEGR, ABS BR CC 1 CC 0 OV OS OR STA RLO FC
Instruction depends on: – – – – – – – – –
Instruction affects: – – – – – – – – –
110
S7-300 Instruction List S7-300 Instruction List
EWA 4NEB 710 6087-02 EWA 4NEB 710 6087-02
111