AbsB

AbsB (FB)

FUNCTION_BLOCK AbsB

Short description

Anti-blocking protection for a binary signal

Representation

Interfaces

Inputs

Name	Data type	Value range	Initial value	Function
xFb	BOOL			Operating message

Outputs

Name	Data type	Value range	Initial value	Function
xOut	BOOL			Enable - Output
xAbsOn	BOOL			Indicator - anti-blocking process
dtAbsLastOn	DATE_AND_TIME			Start date/time of the last anti-blocking process

Setpoints / parameters

Name	Data type	Value range	Initial value	Function
tMinFbTime	TIME		T#30s	Minimum run time
tTime	TIME		120s	Duration of the anti-blocking process
eDay	eDoW		eDow.Monday	Weekday of the anti-blocking process
todStartTime	TOD		08:00:00	Start time of the anti-blocking process

Function description

General

This function block is used to monitor the operating message xFb for activity. The inspection period covers 168 hours each time (= 1 week). The operating message xFb is active if it is continuously active once during the inspection period for the minimum operating duration tMinFbTime The blocking protection process is thereby prevented, the inspection period starts again. If no operating message is available, the request / release can alternatively be connected. If no activity is recorded during the inspection period, the blocking protection process (release - output xOut = TRUE) is triggered after the time duration tTime on the weekday eDay at the time todStartTime . At the same time, the inspection period starts again. The initial triggering of the blocking protection process can, depending on the relevant settings (weekday eDay and todStartTime).

Example

inspection period ends on Tuesday morning, triggering of the blocking protection process only on the following Monday. At the output dtAbsLastOn the start date and start time of the last anti-blocking process are available.

Prerequisite for the use of the AbsB function block

The use of the TimeRead2 function block is required for correct operation.

Enable - Output xOut

xFb	Anti-blocking process	xOut	Notes
X	FALSE	FALSE	Anti-blocking process not active
X	TRUE	TRUE	Anti-blocking process active

Legend: X = any

Indicator - anti-blocking process xAbsOn

xFb	Anti-blocking process	xAbsOn	Notes
X	FALSE	FALSE	Anti-blocking process not active
X	TRUE	TRUE	Anti-blocking process active

Legend: X = any

Setpoint / parameters eDay

The anti-blocking function can be globally disabled by setting eDay = eDow.Inactive.

Setpoint / parameters tTime

The anti-blocking function can be globally disabled by setting tTime = 0s can be globally disabled.

CODESYS

InOut:

Scope	Name	Type	Initial
Input	xFb	BOOL
Input Const	tMinFbTime	TIME	TIME#30s0ms
Input Const	tTime	TIME	TIME#2m0s0ms
Input Const	eDay	eDoW	eDow.Monday
Input Const	todStartTime	TOD	TIME_OF_DAY#8:0
Output	xOut	BOOL
Output	xAbsOn	BOOL
Output	dtAbsLastOn	DT