Моята собствена информация (и контекст) е много малко: става въпрос за т.н. field serial bus (или на друго място в текста - field bus) на фирмата PROFIBUS, като се уточнява, че има Master station и Slave station. Ще дам контекст за самите термини:
1. field serial bus (field bus): By means of the field serial bus, it is possible to interconnect the converter, defined as Slave station and identified with its own address, and a Master station, which will co-ordinate its operation.
2. net connection cards: Description of the PROFIBUS net connection cards
The interface to the Profibus net can be carry out by means of two cards:
3. integrated PLC function: The DPLCVA card is a microprocessor based card, carrying out both the connection to the Profibus net and the integrated PLC function; for this function, the card is serial connected (by X4 9 poles connector) to logic and analog I/O modules.
4. screw terminal block: The figure shows the connector for the Profibus net, putting into evidence the switch inserting the termination resistance of the last line Slave. The continuity of the shields is obtained laying the braided wire of the cable naked on the metallic connector (pos. 2 of the figure). Moreover, the connecting cable of the Slave has to be always connected on the left, always considering the colour sequence while connecting to the screw terminal block inside of the connector.
За съжаление, може да има и грешки в английския текст, защото е превод от италиански и това си личи на места