MC_ReadActPos

Description

The MC_ReadActPos function block reads the actual position of the axis.

Figure 8-119: MC_ReadActPos

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• This function or function block returns cached data. See Programming a Dual Core Controller for more information.

Arguments

For more detail on how inputs and outputs work, refer to PLCopen Function Blocks - General Rules

Input

Enable	Description	Request to read the axis's actual position Keeps continuously to read the actual position every PLC"Programmable Logic Controller" A Programmable Logic Controller, PLC, or Programmable Controller is a digital computer used for automation of industrial processes, such as control of machinery on factory assembly lines. Used to synchronize the flow of inputs from (physical) sensors and events with the flow of outputs to actuators and events cycle, as long as the Enable remains high
	Data type	BOOL
	Range	0, 1
	Unit	n/a
	Default	—
Axis	Description	Name of a declared instance of the AXIS_REF library function. For more details, About Axis Name and Number)
	Data type	AXIS_REF
	Range	[1,256]
	Unit	n/a
	Default	—

Output

Valid	Description	Indicates the value at the Position output is available
	Data type	BOOL
Busy	Description	Indicates this function block is executing
	Data type	BOOL
Error	Description	Indicates an invalid input
	Data type	BOOL
ErrorID	Description	Indicates the error if Error output is set to TRUE. See table in PLCopen Function Block ErrorID Output
	Data type	INT
Position	Description	Actual position of the axis.
	Unit	User unit
	Data type	LREAL

Example

Structured Text

(* MC_ReadActPos ST example *)
Inst_MC_ReadActPos( TRUE, Axis1 );
//Inst_MC_ReadActPos is an instance of MC_ReadActPos function block

ActualPos := Inst_MC_ReadActPos.Position; 
//store Position output into a user defined variable

Ladder Diagram

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