You are here:

FB_PWDutyOutput

Description

The PulseWhen the step gets activated, the action is activated for a single execution, and possibly once again when the step is deactivated Width Duty Cycle function block accepts an input value between the minimum and maximum input range and converts this to a duty cycle percentage. The output is then cycled on and off over the period of the duty cycle at the duty cycle percentage. If it is desired to have the output ON time range from 0 to the duty cycle period, the minimum should be set to zero and the maximum to the duty cycle period. If the calculated duty cycle based on the input and range values is less than the minimum ON time (MinTime), the output will not come on. If the calculated duty cycle is between or equal to the range values the output is cycled by the duty cycle. If the calculated duty cycle is greater than the maximum ON time (MaxTime) the output will remain on.

The following figure shows the function block I/O

UDFB PWDutyOutput

Figure 11-194: Pulse Width Duty Cycle

Arguments

Input

uEN01	Description	EnableEnable signal for the drive, Hardware-Enable with 24V signal to X8, Software-Enable command by setup Software, fieldbus or permanently set. Both are required for enabling the drive. for the block
	Data type	BOOL
	Range	[0 , 1]
	Unit	n/a
	Default	—

uInputCommand	Description	Duty Cycle Input (sometimes the output of a PID"Proportional-Integral-Derivative" A PID controller is a generic control-loop feedback mechanism widely used in industrial control systems. An "error" occurs when an event or a disturbance triggers off a change in the process variable. A PID controller attempts to correct the error between a measured process variable and a desired setpoint by calculating and then outputting a corrective action that can adjust the process accordingly block).
	Data type	REAL
	Range	[0 , 1]
	Unit	n/a
	Default	—

uPeriod	Description	Period of the duty cycle
	Data type	TIME
	Range	[0 , 1]
	Unit	n/a
	Default	—

uMaxInput	Description	Maximum value for the Input
	Data type	REAL
	Range	[0 , 1]
	Unit	n/a
	Default	—

uMinInput	Description	Minimum value for the Input
	Data type	REAL
	Range	[0 , 1]
	Unit	n/a
	Default	—

uMaxTime	Description	Maximum on time for the Output
	Data type	TIME
	Range	[0 , 1]
	Unit	n/a
	Default	—

uMinTime	Description	Minimum on time for the Output
	Data type	TIME
	Range	[0 , 1]
	Unit	n/a
	Default	—

Output

OK	Description	FunctionA function calculates a result according to the current value of its inputs. A function has no internal data and is not linked to declared instances. block is OK.
	Data type	BOOL
	Unit	n/a