Source Mode

In this library, a distinction is made between Internal and Manual as sources for value specifications. The Source Mode is a state machine for managing value specifications from these sources.

Access routes

Internal value specifications are written by the internal PLC logic. The variable names are extended by the suffix *Int.

Manual value specifications are written by a manual operation (e.g. via OPC UA). They are declared as external variables and cannot be written via the internal PLC logic. Manual value specifications add the suffix *Man to the variable name.

States

The state machine has two states: Internal and Manual. In the Internal state, *Int value specifications are processed and in the Manual state, *Man value specifications are processed.

The current state is displayed via the outputs SrcManAct and SrcIntAct.

State change

A state change is carried out via switching requests from the internal PLC logic *Aut or via an operator *Op (according to the Handshake procedure). The input SrcChannel is set via the internal PLC logic and indicates which source can currently trigger a state change.

Internal is prioritized higher than Manual. Therefore, if both states are requested at the same time, the state Internal is assumed.

	The `Source Mode` is part of objects and cannot be used alone.

Inputs

Name	Type	Description	OPC UA access
SrcChannel	BOOL	Selection of switching requests for the state machine: 1: `Automatic` switching requests are taken into account. 0: `Operator` switching requests are taken into account.	Read
SrcIntAut	BOOL	`Automtaic` switching request to transfer the `SourceMode` to the `Internal` state	Read
SrcManAut	BOOL	`Automatic` switching request to transfer the `SourceMode` to the `Manual` state	Read

Name

Type

Description

OPC UA access

SrcChannel

BOOL

Selection of switching requests for the state machine:

1: Automatic switching requests are taken into account.

0: Operator switching requests are taken into account.

Read

SrcIntAut

BOOL

Automtaic switching request to transfer the SourceMode to the Internal state

Read

SrcManAut

BOOL

Automatic switching request to transfer the SourceMode to the Manual state

Read

Outputs

Name	Type	Description	OPC UA access
SrcIntAct	BOOL	`SourceMode` is in the state `Internal.`	Read
SrcManAct	BOOL	`SourceMode` is in the state `Manual.`	Read

External variables

Name	Type	Description	OPC UA access
SrcIntOp	BOOL	`Operator` switching request to transfer the `SourceMode` to the `Internal` state. 0→1: `Operator` request 1→0: Request has been processed.	Read/write
SrcManOp	BOOL	`Operator` switching request to transfer the `SourceMode` to the `Manual` state. 0→1: `Operator` request 1→0: Request has been processed.	Read/write

Name

Type

Description

OPC UA access

SrcIntOp

BOOL

Operator switching request to transfer the SourceMode to the Internal state.

0→1: Operator request

1→0: Request has been processed.

Read/write

SrcManOp

BOOL

Operator switching request to transfer the SourceMode to the Manual state.

0→1: Operator request

1→0: Request has been processed.

Read/write

Methods

Name	Description
SetInternal	Sets the state machine `SourceMode` of the interface to the state `Internal.`
SetManual	Sets the state machine `SourceMode` of the interface to the state `Manual.`