Abs3P

Abs3P (FB)

FUNCTION_BLOCK Abs3P

Short description

Anti-blocking protection for a 3-point actuator

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 runtime
tTime	TIME		120s	Duration of the anti-blocking process
eDay	eDoW		eDow.Monday	Weekday of the anti-blocking process
todStartTime	TOD		08:00:00 hrs	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 covers 168 hours each ( = 1 week ). The signal inputs xFbOpen and XFbClose are active if they are continuously active during the inspection period for the minimum runtime tMinRunTime ( Only xFbOpen or only XFbClose or both ). This prevents the anti-blocking process, and the inspection period restarts. If no activity was recorded 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 restarts. 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 Tuesday morning, triggering of the anti-blocking process only next Monday.\

\

At the output dtAbsLastOn the start date and start time of the last anti-blocking process are available. \

Prerequisite for using the Abs3P function block

For correct operation, the use of the TimeRead2 function block is required.\

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 / parameter eDay

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

Setpoint / parameter tTime

The anti-blocking function can be generally disabled by setting tTime = 0s generally locked.\

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