Arc Cosine (ACOS)
When enabled, the ACOS instruction takes the arc cosine of the Source value and stores the result in the Destination (in radians).
The ACOS operator/function computes the arc cosine of the Source and returns the floating point result. The Source must be greater than or equal to -1 and less than or equal to 1. The resulting value in the Destination is greater than or equal to 0 or less than or equal to pi (where pi = 3.141593). If Source is smaller than -1 or greater than 1 then Destination is set to NAN.
Available Languages
Ladder Diagram
FactoryTalk Design Studio
DSL - Ladder DiagramOperands
IMPORTANT:
Unexpected operation may occur if:
- Output tag operands are overwritten.
- Members of a structure operand are overwritten.
- Except when specified, structure operands are shared by multiple instructions.
There are data conversion rules for mixing numeric data types within an instruction. See Data conversions.
Ladder Diagram
Operand | Data Type | Format | Description |
|---|---|---|---|
Source | SINT INT DINT LINT USINT UINT UDINT ULINT REAL LREAL | Immediate tag | Value to convert to arc cosine. |
Destination | SINT INT DINT LINT USINT UINT UDINT ULINT REAL LREAL | tag | Tag to store result of the instruction. |
Operator Aspects
The ACOS operator can be used in various RLL expressions. ACOS returns a floating point result containing the arc cosine of the Source. Depending on the context this value may then be type converted if appropriate.
Affects Math Status Flags
Conditional, see Math status flags.
Major/Minor Faults
None specific to this instruction. See Index through arrays for array-indexing faults.
Execution
Ladder Diagram
Condition/State | Action Taken |
|---|---|
Prescan | N/A |
Rung-condition-in is false | Set Rung-condition-out to Rung-condition-in. |
Rung-condition-in is true | Set Rung-condition-out to Rung-condition-in. Dest = arc cosine value of the Source. |
Postscan | N/A |
Example
Ladder Diagram
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