Allen-Bradley Logix5000 Reference Manual

540 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 14 Trigonometric Instructions (SIN, COS, TAN, ASN, ASIN, ACS, ACOS, ATN, ATAN)
Arc Cosine (ACS)
The ACS instruction takes the arc cosine of the Source value and stores the result
in the Destination (in radians).
Operands:
Relay Ladder
Structured Text
Use ACOS as a function. This function computes the arc cosine of source and
stores the result in dest.
See Structured Text Programming
for information on the syntax of expressions
within structured text.
Function Block
FBD_MATH_ADVANCED Structure
Description: The Source must be greater than or equal to -1 and less than or equal to 1. The
resulting value in the Destination is always greater than or equal to 0 or less than
or equal to π (where π = 3.141593).
Arithmetic Status Flags: Arithmetic status flags are affected.
Operand Type Format Description
Source SINT
INT
DINT
REAL
Immediate
Tag
Find the arc cosine of this value
Destination SINT
INT
DINT
REAL
Tag Tag to store the result
Operand Type Format Description
ACS tag FBD_MATH_ADVANCED Structure ACS structure
dest := ACOS(source);
Input Parameter Data Type Description:
EnableIn BOOL Enable input. If cleared, the instruction does not execute and outputs are not updated.
Default is set.
Source REAL Input to the math instruction.
Valid = any float
Output Parameter Data Type Description
EnableOut BOOL The instruction produced a valid result.
Dest REAL Result of the math instruction. Arithmetic status flags are set for this output.

Allen-Bradley Logix5000 Specifications

General

Brand	Allen-Bradley
Model	Logix5000
Category	Controller
Language	English