Operation Mode

In this library, a distinction is made between Operator and Automatic as sources for switching requests. The Operation Mode is a state machine for managing switching requests from these sources.

Access routes

Automatic switching requests are written by the internal PLC logic. The variable names are extended by the suffix *Aut.

Operator switching requests are made manually (e.g. via OPC UA). They are declared as external variables and cannot be written via the internal PLC logic. Operator switching requests add the suffix *Op to the variable name.

States

The state machine has three states: Offline, Operator and Automatic. No new switching requests are processed in the Offline state. In the Operator state, *Op switching requests are processed and in the Automatic state, *Aut switching requests are processed.

The current state is displayed via the outputs StateOffAct, StateOpAct and StateAutAct.

State change

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

States are prioritized as follows: Offline > Operator > Automatic. It follows that if all three states are requested at the same time, the state Offline is assumed. If Operator and Automatic are requested at the same time, the state Operator is assumed.

	A direct transition from the state `Offline` to the state `Automatic` is not provided for in the MTP guideline, but is supported by the state machine.

	The `Operation Mode` is part of objects in this library and cannot be used alone.

Inputs

Name	Type	Description	OPC UA access
StateChannel	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
StateOffAut	BOOL	`Automatic` switching request to transfer the `Operation Mode` to the `Offline` state.	Read
StateOpAut	BOOL	`Automatic` switching request to transfer the `Operation Mode` to the `Operator` state.	Read
StateAutAut	BOOL	`Automatic` switching request to transfer the `Operation Mode` to the `Automatic` state	Read

Outputs

Name	Type	Description	OPC UA access
StateOffAct	BOOL	1: Current state is `Offline.`	Read
StateOpAct	BOOL	1: Current state is `Operator.`	Read
StateAutAct	BOOL	1: Current state is `Automatic.`	Read

External variables

Name	Type	Description	OPC UA access
StateOffOp	BOOL	`Operator` switching request to transfer the `Operation Mode` to the `Offline` state. 0→1: `Operator` request 1→0: Request has been processed.	Read/write
StateOpOp	BOOL	`Operator` switching request to transfer the `Operation Mode` to the `Operator` state. 0→1: `Operator` request 1→0: Request has been processed.	Read/write
StateAutOp	BOOL	`Operator` switching request to transfer the `Operation Mode` to the `Automatic` state. 0→1: `Operator` request 1→0: Request has been processed.	Read/write

Name

Type

Description

OPC UA access

StateOffOp

BOOL

Operator switching request to transfer the Operation Mode to the Offline state.

0→1: Operator request

1→0: Request has been processed.

Read/write

StateOpOp

BOOL

Operator switching request to transfer the Operation Mode to the Operator state.

0→1: Operator request

1→0: Request has been processed.

Read/write

StateAutOp

BOOL

Operator switching request to transfer the Operation Mode to the Automatic state.

0→1: Operator request

1→0: Request has been processed.

Read/write

Methods

Name	Description
SetOffline	Sets the state machine `OperationMode` of the interface to the state `Offline.`
SetOperator	Sets the state machine `OperationMode` of the interface to the state `Operator.`
SetAutomatic	Sets the state machine `OperationMode` of the interface to the state `Automatic.`