| Overload | Description | 
|---|---|
| ARTICLE_PLCISBUSCOUPLER | Bus coupler / head station # 22019. | 
| Overload | Description | 
|---|---|
| ARTICLE_PLCISBUSCOUPLER | Bus coupler / head station # 22019. | 
Property of a part variant. Identifies a device as a bus coupler or as a head station. In the case of a head station the Rack property has to be filled additionally for the respective PLC card.