Cosine (COS)
This table lists the controllers and applications that support this instruction.
Architecture | Standard applications | Safety applications |
|---|---|---|
CompactLogix 5370, ControlLogix 5570, Compact GuardLogix 5370, and GuardLogix 5570 controllers | Yes | No |
CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers | Yes | Yes |
The COS instruction takes the cosine of the Source value (in radians) and stores the result in the Destination. The COS operator/function computes the cosine of Source and returns the floating point result. The resulting value is always greater than or equal to -1 and less than or equal to 1.
Available Languages
Ladder Diagram
Function Block Diagram
Function Block Diagram supports these elements:
FBD Block
FBD Function
TIP:
FBD Function is applicable to CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers only.
Structured Text
This instruction is not available in structured text.
TIP:
Use COS as an operator in an expression to compute the same result. Refer to Structured Text Syntax for more information on the syntax of expressions and assignments within structured text.
Ladder Diagram
Operand | Data Type CompactLogix 5370, ControlLogix 5570, Compact GuardLogix 5370, and GuardLogix 5570 controllers | Data Type CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers | Format | Description |
Source | SINT INT DINT REAL | SINT INT DINT LINT USINT UINT UDINT ULINT REAL LREAL | Immediate tag | Find the cosine of this value. |
Destination | SINT INT DINT REAL | SINT INT DINT LINT USINT UINT UDINT ULINT REAL LREAL | tag | Tag to store the result. |
Function Block Diagram
FBD Block
Operand | Type | Format | Description |
COS tag | FBD_MATH_ADVANCED | tag | COS structure |
FBD Function
TIP:
FBD Function is applicable to CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers only.
Operand | Data Type | Description |
Source | SINT INT DINT LINT USINT UINT UDINT ULINT REAL LREAL | Value to convert to cosine. |
Output Operand (Right Pin) | Data Type CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers | Description |
Dest | REAL LREAL | Result of the function. |
See FBD Functions.
Operator Aspects
The COS operator can be used in various expressions. Similarly, the COS function is invoked in Structured Text statements. Both applications of COS return a floating point result containing the cosine of the Source. Depending on the context this value may then be type converted if appropriate.
FBD_MATH_ADVANCED Structure
Input Members | Data Type | Description |
EnableIn | BOOL | Enable input. If false, the instruction does not execute and outputs are not updated.
Default is set. |
Source | REAL | Input to the trigonometric instruction. |
Output Members | Data Type | Description |
EnableOut | BOOL | Indicates if instruction is enabled. |
Dest | REAL | Result of the math instruction. |
Affects Math Status Flags
Controllers | Affects Math Status Flag |
CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers | Conditional, see Math Status Flags. |
CompactLogix 5370, ControlLogix 5570, Compact GuardLogix 5370, and GuardLogix 5570 controllers | Yes |
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 = cosine value of the Source. |
Postscan | N/A |
Function Block Diagram
FBD Block
Condition/State | Action Taken |
Prescan | N/A |
EnableIn is false | Set EnableOut to EnableIn. |
EnableIn is true | Dest = cosine value of the Source. If overflow occurs Clear EnableOut to false else Set EnableOut to true. |
Instruction first scan | N/A |
Instruction first run | N/A |
Postscan | N/A |
FBD Function
TIP:
FBD Function is applicable to CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers only.
Condition/State | Action Taken |
Prescan | N/A |
Normal Scan | Dest = cosine value of the Source. |
Instruction first run | N/A |
Instruction first scan | N/A |
Postscan | N/A |
Example
Ladder Diagram
Function Block Diagram
FBD Block
FBD Function
Structured Text
REAL_dest := COS(REAL_src);
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