The vendors must apply to the PROFIBUS Support Center for an individual indent Number for every DP/PA device type.
This ensures very high protection against parameterization faults. User data transfer in the operation phase is only possible when the right DP Slave is connected to the correct address. The master compares the indent Number of each connected device with the indent Number in the configuration database. This number is necessary so that a DP-master is able to identify the types of the connected DP/PA devices without a significant protocol overhead. Indent Numbers: What Are They, Where Do I Get Them?Įvery DP/PA device type has to have an individual indent Number. PROFIBUS-DP is included into the European Fieldbus Standard EN 50170. It is suitable as a replacement for the costly parallel wiring of 24 V and 4(0) to 20 mA measurement signals. This is the performance optimized version of PROFIBUS, specifically dedicated to time-critical communication between automation systems and distributed peripherals. Programmable Logic Controller (PLC) Interview Questions This can be done with a ground bus bar in front of the bus connector. In such a case it is better to bare the cable shield at an appropriate point and to ground it with a cable as short as possible to the metallic structure of the cabinet. It should be noticed that this is not the optimal solution. If this is not possible the connection can be made via pin 1 of the D-sub connector. Preferably, the connection between shield and protective ground should be made via the metal cases and the screw top of a D-sub connector. in a refinery) the shield should be connected only on one end of the cable to ‘ground’. It is recommended to connect the shield on both ends low inductively to ‘ground’ in order to achieve optimal electromagnetic compatibility. How Do I Terminate The Shielding Of The Cable? When PROFINET, PI’s Industrial Ethernet solution, was launched, PROFIBUS International was re-named ‘PI’ (PROFIBUS and PROFINET International). It is the umbrella organization responsible for the PROFIBUS protocol and its promotion and support across the world via a network of Regional PI Associations. PI was formerly known as PROFIBUS International.