TrigGen

TrigGen (FB)

FUNCTION_BLOCK TrigGen

Short description

Pulse generation with adjustable time interval.

Representation

Interfaces

Inputs

Name	Data type	Value range	Initial value	Function
xEn	BOOL			Enable input
wInterval	WORD			Time value for time interval
eTimeBase	eTimeMS			Time base for time interval
xEnImp	BOOL			Option enable 1st pulse

Outputs

Name	Data type	Value range	Initial value	Function
xTrig	BOOL			Pulse output
tNextImp	TIME			Remaining time until the next pulse

Function description

General

At the pulse output xTrig pulses with a duration of one program cycle and a time interval of (wInterval multiplied by eTimeBase) are generated cyclically if the enable input xEn is active.

Limitation of the maximum time interval

The time interval is limited to a maximum of 48 days to avoid an internal value overflow.

Example for calculating the time interval

wIntervall = 1000, eTimeBase = Millisecond, pulses are generated at a time interval of 1000 ms.

Enable 1st pulse xEnImp

When the option is active (xEnImp = TRUE) the 1st pulse is generated immediately after the enable. xEn is generated. If the option is not active (xEnImp = FALSE) the 1st pulse is generated after the enable xEn after the expiry of a time interval.

Remaining time until the next pulse tNextImp

At this output the remaining time until the next pulse is shown if the enable input (*xEn = TRUE) is active. In all other situations the constant 0.0 is shown.

Codesys

InOut:

Scope	Name	Type
Input	xEn	BOOL
Input	wInterval	WORD
Input	eTimeBase	eTimeMS
Input	xEnImp	BOOL
Output	xTrig	BOOL
Output	tNextImp	TIME