FB_MTP_MonAnaVlv

The function block FB_MTP_MonAnaVlv is an object for controlling an analog valve from different sources: internal PLC logic or manual operation (access via OPC UA). Switching requests and value specifications are managed independently of each other via the state machines Operation Mode and Source Mode. It also includes the option of monitoring the output values with the respective feedback signals. The OPC UA access rights are described in the variable tables.

Controlling the valve

The specification for opening and closing the valve is made via the switching requests Open* and Close*. The state machine of the Operation Mode manages whether and from which source new switching requests are processed. For simultaneous requests from Open* and Close*, Close* has the highest priority. If Locking is active, control of the outputs via the switching requests is prevented or the safety position is assumed.

Setpoint specification

The position is specified via Pos* variables. The position specification is managed by the state machine of the Source Mode and output according to the diagram below:

Safety position

The safety position is defined via the variables SafePosEn and SafePos .

The variable SafePosEn is used to describe whether the valve has a fixed safety position (SafePosEn = TRUE) or whether the current position should be maintained (SafePosEn = FALSE)

The safety position is described with SafePos:

SafePos = FALSE: Safety position of the valve: PosMin

SafePos = TRUE: Safety position of the valve: PosMax

Monitoring

The control and the respective Feedback can be monitored via Feedback monitoring.

The interface also has a position monitor, which extends the Feedback monitoring with two additional outputs:

The output PosReachedFbk indicates whether the set position has been reached:

PosReachedFbk = (PosFbk - Pos) <= PosTolerance

The time to reach the position is specified via the input MonPosTi. If the time is exceeded, the output MonPosErr is set to TRUE.

Further characteristics

Inheritance hierarchy

FB_MTP_AnaVlv

FB_MTP_MonAnaVlv

Inputs

Name	Type	Description	OPC UA access
TagName	STRING	Name of the interface	-
TagDescription	STRING	Description of the interface	-
WQC	BYTE	Worst Quality Code	Read
OSLevel	BYTE	Level must be defined for system. Value 0 is reserved for local operation.	Read/write
State*		See Operation Mode
OpenAut	BOOL	`Automatic` switching request to move to the selected position of the valve.	Read
CloseAut	BOOL	`Automatic` switching request to close the valve.	Read
OpenFbkCaIc	BOOL	Source of the feedback signal Limit switch Valve open: 1: Calculated 0: Sensor	Read
OpenFbk	BOOL	Feedback signal Limit switch Valve open	Read
CloseFbkCaIc	BOOL	Source of the feedback signal Limit switch Valve closed: 1: Calculated 0: Sensor	Read
CloseFbk	BOOL	Feedback signal Limit switch Valve closed.	Read
Src*		See Source Mode
PosInt	REAL	`Internal` value specification for the position	Read
PosUnit	INT	Unit of the position	Read
PosMin	REAL	Lower limit of the value specification for the valve position	Read
PosMax	REAL	Upper limit of the value specification for the valve position	Read
PosFbkCaIc	BOOL	Source of the position feedback value: 1: Calculated 0: Sensor	Read
PosFbk	REAL	Feedback value of the position	Read
PosScIMin	REAL	Scale start of the position display	Read
PosScIMax	REAL	Scale end of the position display	Read
Perm* Int* Prot*		See Locking
SafePosEn	BOOL	Use the safe position of the valve: 1: Use safe position. 0: Do not use safe position.	Read
SafePos	BOOL	Safe position of the valve: 1: Open 0: Closed	Read
ResetAut	BOOL	`Automatic` reset switching request: 1: Reset requested. 0: No reset requested.	Read

Outputs

Name	Type	Description	OPC UA access
State*		See Operation Mode
OpenAct	BOOL	Open valve switching command.	Read
CloseAd	BOOL	Close valve switching command.	Read
Src*		See Source Mode
Pos	REAL	Position setpoint on valve	Read
SafePosAct	BOOL	Safe position: 1: Move to a safe position 0: Normal operation	Read

External variables

Name	Type	Description	OPC UA access
State*		See Operation Mode
OpenOp	BOOL	`Operator` switching request to move to the selected position of the valve.	Read/write
CloseOp	BOOL	`Operator` switching request to close the valve.	Read/write
Src*		See Source Mode
PosMan	BOOL	`Manual` value specification for the position	Read/write
PosRbk	REAL	Unprocessed value of the `Operator` Value specification for the position	Read/write
ResetOp	BOOL	`Operator` reset switching request: 0→1: `Operator` request 1→0: Request has been processed.	Read/write
MonEn	BOOL	Enable `FeedbackMonitoring`: 1: `FeeedbackMonitoring` active 0: `FeedbackMonitoring` inactive	Read/write

Methods

Name	Description
SetOffline SetOperator SetAutomatic	See Operation Mode
SetInternal SetManual	See Source Mode

Name

Description

SetOffline

SetOperator

SetAutomatic

See Operation Mode

SetInternal

SetManual

See Source Mode