Features¶
Transmission technique
- RS485, potential separated.
- Twisted pair cable or optical fibre as a medium for the bus.
- Up to 32 stations (master and slave modules) without repeaters and up to 126 stations on one bus with repeaters.
- Integrated repeater controller.
Communication
- Up to 244 bytes of input data and 244 bytes of output data per slave.
- Cyclic user data transfer between DP master and DP slave.
- Acyclic data transfer from master to master.
- Slave configuration check.
- Efficient diagnosis functions, 3 graduated diagnosis messaging levels.
- Synchronization of inputs and/or outputs via control commands.
Protection functions
- Message transfer with Hamming distance HD = 4.
- Errors during data transfer are detected by the CRC check and cause a repetition of the telegram.
- Access protection for inputs and outputs of the slaves.
- Incorrect parameter settings are avoided since bus stations with faulty parameters are not included in the user data operation.
- A failure of a bus station is registered in the master and indicated via a common diagnosis.
Standardization: PROFIBUS DP
IEC61158 / DIN EN series
Terms, Definitions and Abbreviations
PROFIBUS DP
| PROFIBUS DP | Process Fieldbus - Decentral Periphery |
| DPM1 | DP master (class 1), normal bus master |
| DPM2 | DP master (class 2), commissioning device |
| DPS | DP slave, I/O module |
| GSD | Modules master data |
| DPV1 | Guideline for functional expansions of PROFIBUS DP |
| PNO | PROFIBUS Nutzer Organisation (PROFIBUS user organization) |