FB_MTP_MonBinVlv

The function block FB_MTP_MonBinVlv is an object for controlling a binary valve from different sources: internal PLC logic or manual operation (e.g. via OPC UA). Switching requests are managed via the state machine Operation Mode. It also includes the option of monitoring the output value with the respective feedback. 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.

If requests are sent simultaneously to Open* and Close*, the safety position takes precedence: SafePosEn := FALSE means the valve remains in its current state. In SafePosEn = TRUE, the valve opens when SafePos = TRUE or closes when SafePos = FALSE

If Locking is active, control of the outputs via the switching requests is prevented or the safety position is assumed.

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: closed

SafePos = TRUE: Safety position of the valve: open

Monitoring

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

Further properties

Inheritance hierarchy

FB_MTP_BinVlv

FB_MTP_MonBinVlv

Implemented interfaces

I_MTP_MonBinVlv

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
StateChannel StateOffAut StateOpAut StateAutAut		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 valve-open limit switch feedback signal: 1: Calculated 0: Sensor	Read
OpenFbk	BOOL	Valve-open limit switch feedback signal	Read
CloseFbkCaIc	BOOL	Source of the feedback signal Valve-closed limit switch: 1: Calculated 0: Sensor	Read
CloseFbk	BOOL	Valve-closed limit switch feedback signal.	Read
PermEn Permit IntlEn Interlock ProtEn Protect		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
MonEn	BOOL	Enable `FeedbackMonitoring`: 1: `FeeedbackMonitoring` active 0: `FeedbackMonitoring` inactive	Read/write
MonStatTi	REAL	Monitoring time for static errors [s]	Read
MonDynTi	REAL	Monitoring time for dynamic errors [s]	Read
MonSafePos	BOOL	Behavior of the interface after an error occurs: 1: Safe position should be approached. 0: The current state is retained.	Read

	It is possible to change the value of the input variable `MonEn` during runtime; however, according to the MTP guideline, this is not permitted because the value is changed via manual operation (e.g., via OPC UA).

Outputs

Name	Type	Description	OPC UA access
StateOffAct StateOpAct StateAutAct		See Operation Mode
Ctrl	BOOL	Valve switching command: 1: Open 0: Close	Read
SafePosAct	BOOL	Safe position: 1: Move to the safe position. 0: Normal operation	Read
MonStatErr	REAL	Static error: 1: active 0: inactive	Read
MonDynErr	REAL	Dynamic error: 1: active 0: inactive	Read

External variables

Name	Type	Description	OPC UA access
StateOffOp StateOpOp StateAutOp		See Operation Mode
OpenOp	BOOL	`Operator` switching request to open the valve.	Read/write
CloseOp	BOOL	`Operator` switching request to close the valve.	Read/write
ResetOp	BOOL	`Operator` reset switching request: 0→1: `Operator` request 1→0: Request has been processed.	Read/write

Methods

Name	Type	Description
IsOffline IsOperator IsAutomatic SetOffline SetOperator SetAutomatic		See Operation Mode
Open	BOOL	The `Open` method allows the valve to be opened. In this process, the `OperationMode` is transformed into the state `SetAutomatic` using the method `Automatic`. The `Aut` switching requests are set to defined values, and the internal logic is invoked. Finally, the `Aut` switching requests are reset to `FALSE`. Returns `TRUE` if `OpenFbk = TRUE` and `CloseFbk = FALSE`.
Close	BOOL	The `Close` method allows the valve to be opened. In this process, the `OperationMode` is transformed into the state `SetAutomatic` using the method `Automatic`. The `Aut` switching requests are set to defined values, and the internal logic is invoked. Finally, the `Aut` switching requests are reset to `FALSE`. Returns `TRUE` if `OpenFbk = FALSE` and `CloseFbk = TRUE`.

Name

Type

Description

IsOffline

IsOperator

IsAutomatic

SetOffline

SetOperator

SetAutomatic

See Operation Mode

Open

BOOL

The Open method allows the valve to be opened. In this process, the OperationMode is transformed into the state SetAutomatic using the method Automatic. The *Aut switching requests are set to defined values, and the internal logic is invoked. Finally, the *Aut switching requests are reset to FALSE.

Returns TRUE if OpenFbk = TRUE and CloseFbk = FALSE.

BOOL

The Close method allows the valve to be opened. In this process, the OperationMode is transformed into the state SetAutomatic using the method Automatic. The *Aut switching requests are set to defined values, and the internal logic is invoked. Finally, the *Aut switching requests are reset to FALSE.

Returns TRUE if OpenFbk = FALSE and CloseFbk = TRUE.