MC_LoadControl (FB)

FUNCTION_BLOCK MC_LoadControl

This function block commands a controlled torque/force/pressure movement.

This function block continuously exerts a torque or force or pressure of the specified magnitude. This magnitude is approached using a defined ramp (‘LoadRamp’), and the function block sets the ‘InLoad’ output if the commanded load level is reached. Positive torque, force and differential pressure is in the positive direction of velocity, pressure is physically unsigned.

Example

The function block LoadControl provides base functionality for any application in which the devolution of forces, torque or pressures provided by an axis to a process has to be actively defined and controlled (e.g. in presses).

Note

Using this command leads to undefined motion of the axis, unless other (motion controlled) axes or mechanical structures (arrester) are involved.

InOut:

Scope	Name	Type	Initial	Comment
Input	Execute	BOOL		Starts the function block at rising edge
	ContinuousUpdate	BOOL		Decide if new input parameters are processed during the movement. This input is checked only when Execute gets TRUE
	Load	LREAL		[u] = technical unit. Value of the load, Torque/ Force/ Pressure. Positive and negative values are allowed
	LoadRamp	LREAL		[u/s] = technical unit. Absolute value of the input is considered. If LoadRamp = 0, will result in a jump for load- change, as fast as possible
	Direction	MC_Direction	Default	Input Load itself is a signed value. “Direction” applies to the movement for, required load to reach with a positive or negative reference or any direction required. DEFAULT: The required load will be reached, no matter what direction movement is required POSITIVE: The required load will be reached just when it is possible to do so with movement in positive direction NEGATIVE: The required load will be reached just when it is possible to do so with movement in negative direction
	BufferMode	MC_BufferMode		Not supported, default mcABORTING used
Output	InLoad	BOOL		Commanded load finally reached, the actual load can be different
	Busy	BOOL		The function block is not finished
	Active	BOOL		Indicates that the function block has control on the axis
	CommandAborted	BOOL		Command is aborted by another command from other PLCopen function block
	Error	BOOL		Signals that error has occurred within function block
	ErrorID	AC500_MotionControl.ERROR_ID		Error identification. For error details refer to enumeration ERROR_ID from AC500_MotionControl library
Inout	Load_Axis	Load_Ref		Reference to axis