FB_MTP_BinVlv

The function block FB_MTP_BinVlv 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. 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.

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

Further characteristics

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
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

Ctrl

BOOL

Valve switching command:

1: Open

0: Close

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 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	Description
SetOffline SetOperator SetAutomatic	See Operation Mode

Name

Description

SetOffline

SetOperator

SetAutomatic

See Operation Mode