Abs3P

Abs3P (FB)

FUNCTION_BLOCK Abs3P

Short description

Anti-blocking protection for a 3-point drive

Representation

Interfaces

Inputs

Name	Data type	Value range	Initial value	Function
xFbOpen	BOOL			Signal - Input - Plus
XFbClose	BOOL			Signal - Input - Minus

Outputs

Name	Data type	Value range	Initial value	Function
xOutOpen	BOOL			Enable - Output - Plus
xOutClose	BOOL			Enable - Output - Minus
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
tMinRunTime	TIME		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 signal inputs xFbOpen and XFbClose for activity. The inspection period always covers 168 hours (= 1 week). The signal inputs xFbOpen and XFbClose are active if they are continuously active during the minimum run time within the inspection period tMinRunTime only (Only xFbOpen or only XFbClose or both). This prevents the anti-blocking process, and the inspection period starts again. If no activity was detected during the inspection period, the anti-blocking process is triggered on the weekday eDay at the time todStartTime . At the same time the inspection period starts again. The active anti-blocking process is divided into two consecutive time sections (Section 1 and Section 2) In Section 1, during the time duration tTime the combination Enable - Output xOutOpen = TRUE, Enable - Output xOutClose = FALSE is output. In Section 2, during the time duration tTime the combination Enable - Output xOutOpen = FALSE, Enable - Output xOutClose = TRUE is output. The initial triggering of the anti-blocking process can be delayed depending on the relevant settings (weekday eDay and todStartTime).

Example

Inspection period ended on Tuesday morning, triggering of the anti-blocking 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 using the function block Abs3P

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

Enable - Output xOutOpen

xFbOpen	Anti-blocking process	xOutOpen	Notes
X	FALSE	FALSE	Anti-blocking process not active
X	TRUE	TRUE	Anti-blocking process active - Section 1
X	TRUE	FALSE	Anti-blocking process active - Section 2

Legend: X = any

Enable - Output xOutClose

xFbClose	Anti-blocking process	xOutClose	Notes
X	FALSE	FALSE	Anti-blocking process not active
X	TRUE	FALSE	Anti-blocking process active - Section 1
X	TRUE	TRUE	Anti-blocking process active - Section 2

Legend: X = any

Indicator - anti-blocking process xAbsOn

This output is used to indicate an active anti-blocking process (xAbsOn = TRUE).

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	xFbOpen	BOOL
Input	xFbClose	BOOL
Input Const	tMinRunTime	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	xOutOpen	BOOL
Output	xOutClose	BOOL
Output	xAbsOn	BOOL
Output	dtAbsLastOn	DT