Valve3P (FB)

FUNCTION_BLOCK Valve3P

Short Description

Control of a 3-point valve drive and calculation of the valve position

In addition, the 3-point drive is protected by a blocking protection function.

Typical application: Control of a 3-point valve drive in a heating circuit

Portrayal

Interfaces

Inputs

Name	Datatype	Range	Init-Value	Function
xInOpen	BOOL			Requirement - Valve opening
xInClose	BOOL			Requirement - Valve closure
eAOOOpen	HVACTYPES.eManBin	HVACTYPES.eManBin.Auto, HVACTYPES.eManBin.ManOff, HVACTYPES.eManBin.ManOn		Operating mode of manual override - hardware for the valve opening
eAOOClose	HVACTYPES.eManBin	HVACTYPES.eManBin.Auto, HVACTYPES.eManBin.ManOff, HVACTYPES.eManBin.ManOn		Operating mode of manual override - hardware for the valve closing

Outputs

Name	Datatype	Range	Init-Value	Function
xHBOpen	BOOL			Release - Valve opening after manual override
xHBClose	BOOL			Release - valve closing after manual override
xABOpen	BOOL			Release - Valve opening before manual override
xABClose	BOOL			Release - valve closing before manual override
dtAbsLastOn	DATE_AND_TIME			Startdate / -Timepoint of the last blocking protection process
rPos	REAL	0.0 ... 100.0		Current valve position

Setpoints / Parameters

Name	Datatype	Range	Init-Value	Function
tDuration	TIME		120s	Operating time of the drive
udiAbsTime	UDINT	0 bis 3600s	200s	Time duration of the blocking protection process
todAbsStartTime	TOD		TOD#09:00:00 Uhr	Time point of the blocking protection process
eAbsDay	eDoW		eDow.Montag	Weekday of blocking protection process
eManModeOpen	eMANBIN	eMANBIN.Auto, eMANBIN.Off, eMANBIN.On	eMANBIN.Auto	Operating mode of manual override - Valve opening
eManModeClose	eMANBIN	eMANBIN.Auto, eMANBIN.Off, eMANBIN.On	eMANBIN.Auto	Operating mode of manual override - Valve closure

Functional description

General

This function component is used to control the position of a 3-point valve drive through the xHBOpen or xHBClose outputs enable - valve opening after manual override.

The current valve position is permanently calculated and is available at the rPos output.

Essentially, the following function blocks are used:

Abs3P

ManBin

Position3P

Blocking protection process

This process is realised by the monitoring of signals 1 and 2 for activity and, if required, by triggering blocking protection.

The test period covers in each case168 hours (= 1 week).

Signals 1 and 2 are active if they are continuously active in the test period during the minimum operating time of 30.0 secs (only signal 1 or only signal 2 or both).

The blocking protection process is thus prevented, the test time restarting.

Signal 1: ( xInOpen AND eAOOOpen = HVACTYPES.eManBin.Auto ) OR ( eAOOOpen = HVACTYPES.eManBin.ManOn )

Signal 2: ( xInClose AND eAOOClose = HVACTYPES.eManBin.Auto ) OR ( eAOOClose = HVACTYPES.eManBin.ManOn )

If no activity was detected during the test period, the blocking protection process is triggered on the eAbsDay weekday at the todAbsStartTime time.

At the same time, the test period restarts.

The active blocking protection process is divided into two consecutive periods of time (Section 1 and Section 2)

In section 1, the combination xABOpen enable - output = TRUE, xABClose enable - output = FALSE is output during the udiAbsTime time period.

In section 2, the combination xABOpen enable - output = FALSE, xABClose enable - output = TRUE is output during the udiAbsTime time period.

The initial triggering of the blocking protection process can be delayed depending on the relevant settings (eAbsDay weekday and todAbsStartTime)

.

Example

Testing period completed on Tuesday morning, start of the blocking protection process not until next Monday.

At the dtAbsLastOn output, the start date and the start time of the last blocking protection process are available.

Prerequisite for the use of the Abs3P functional component

For correct function, the use of the function block TimeRead with xEn = TRUE is mandatory.

xABOpen enable - valve opening before manual override

The xABOpen enable - valve opening before manual override is influenced by the *xInOpen*input request - valve opening and the blocking protection module.

xInOpen	Blocking protection process	xABOpen	Notes
FALSE	FALSE	FALSE	Request not active, no blocking protection process
X	TRUE	Section 1: TRUE Section 2: FALSE	Blocking protection process active
TRUE	FALSE	TRUE	Request active, no blocking protection process

Legend: X = any

*xABClose*enable - valve closure before manual override

The xABClose enable - valve closure before manual override is influenced by the xInClose input request - valve closing and the blocking protection module

xInClose	Blocking protection process	xABClose	Notes
FALSE	FALSE	FALSE	Request not active, no blocking protection process
X	TRUE	Section 1: FALSE Section 2: TRUE	Blocking protection process active
TRUE	FALSE	TRUE	Request active, no blocking protection process

Legend: X = any

xHBOpen enable - valve opening after manual override

The xHBOpen*enable - valve opening after manual override corresponds to the *xABOpen enable - valve opening before manual override

additionally extended to a manual override module.

xABOpen	eManModeOpen	xHBOpen	Notes
FALSE	eMANBIN.Auto	FALSE	Manual override module in automatic mode
TRUE	eMANBIN.Auto	TRUE	Manual override module in automatic mode
X	eMANBIN.On	TRUE	Manual override module in manual mode On
X	eMANBIN.Off	FALSE	Manual override module in manual mode Off

Legend: X = any

xHBClose enable - valve closing after manual override

The xHBClose enable - valve closure after manual override corresponds to the xABClose enable - valve closure before manual override

additionally extended to a manual override module.

xABClose	eManModeOpen	xHBClose	Notes
FALSE	eMANBIN.Auto	FALSE	Manual override module in automatic mode
TRUE	eMANBIN.Auto	TRUE	Manual override module in automatic mode
X	eMANBIN.On	TRUE	Manual override module in manual mode On
X	eMANBIN.Off	FALSE	Manual override module in manual mode Off

Legend: X = any

Forced control of manual overrides of the outputs

If the eManModeOpen operating mode of manual override - valve opening is in the eMANBIN.On state (= manual override open active),

then the eManModeClose operating mode of the manual override - valve closing is forcibly offset into the eMANBIN.Off state

(= manual override close not active).

If the eManModeClose operating mode of manual override - valve closing in the eMANBIN.On state (= manual override close active),

then the eMANBIN.On operating mode of manual override - valve opening eManModeOpen is forcibly offset into the eMANBIN.Off state

(= manual override open not active).

rPos current valve position

It is used to display the current position of the 3-point drive in the range 0 - 100% and is calculated from the duration of the signals at the outputs

xHBOpen enable - valve opening after manual override and xHBClose enable - valve closing after manual override is calculated in combination with

the tDuration duration of the drive.

The position display is independent of the signal generation, that is, if the position indicator reaches a final position (0% or 100%), then

nevertheless, signals continue to be generated at the xABOpen and xABClose or xHBOpen and xHBClose outputs.

The position indicator does not take into account the possible position changes caused by the manual override - hardware.

Visualization

Information

Element	Authors	Date	Version	Note
Function	Adam Bartod	11.2017	1.0	Ursprungsversion
Programming	Adam Bartod	11.2017	1.0	Ursprungsversion
Test	Jochen Reu /	11.2017	1.0	Ursprungsversion
Documentation	Jochen Reu	11.2017	1.0	Ursprungsversion

Codesys

InOut:

Scope	Name	Type	Initial	Comment
Input	xInOpen	BOOL		Requirement - Valve opening
	xInClose	BOOL		Requirement - Valve closure
	eAOOOpen	eManBin		Operating mode of manual override - hardware for the valve opening
	eAOOClose	eManBin		Operating mode of manual override - hardware for the valve closing
Output	xHBOpen	BOOL		Release - Valve opening after manual override
	xHBClose	BOOL		Release - valve closing after manual override
	xABOpen	BOOL		Release - Valve opening before manual override
	xABClose	BOOL		Release - valve closing before manual override
	dtAbsLastOn	DT		Startdate / -Timepoint of the last blocking protection process
	rPos	REAL		Current valve position
Input	tDuration	TIME	TIME#2m0s0ms	Operating time of the drive
	udiAbsTime	UDINT	200	Time duration of the blocking protection process
	todAbsStartTime	TOD	TIME_OF_DAY#9:0	Time point of the blocking protection process
	eAbsDay	eDoW	eDow.Monday	Weekday of blocking protection process
	eManModeOpen	eMANBIN	eMANBIN.Auto	Operating mode of manual override - Valve opening
	eManModeClose	eMANBIN	eMANBIN.Auto	Operating mode of manual override - Valve closure