Service Mode

Three sources for switching requests and value specifications are available for the services:

• Manual operation (e.g. via OPC UA): Operator
• Internal PLC logic: Automatic-Internal
• Control system (e.g. via OPC UA): Automatic-External

Operation mode control

The operation mode control allows you to switch between the states Offline, Operator and Automatic.

In the Offline state, no new switching requests and value specifications are taken into account. 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.

The state change is carried out via the internal PLC logic or via the operator. The input StateChannel is set via the internal PLC logic and specifies which source is taken into account during processing.

The states are prioritized as follows: Offline > Operator > Automatic.

This means 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

Source selection (Automatic)

The source selection is used in the Automatic operation mode and allows you to switch between Automatic-Internal and Automatic-External.

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

Automatic-External value specifications are written manually (e.g. via OPC UA).

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.

Service Mode is part of interfaces and cannot be used alone!

Diagram of the state machines:

The state machines work according to the following diagram: