Features¶

Transmission technique

RS485, potential separated, insulation voltage up to 850 V.
Twisted pair cable or optical fibre as a medium for the bus.
Up to 32 subscribers (master and slave modules) without repeaters and up to 126 subscribers on one bus with repeaters.
Integrated repeater controller.

Communication

Up to 244 bytes of input data and 244 bytes of output data per slave, 2944 I/O points max.
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 subscribers with faulty parameters are not included in the user data operation.
A failure of a bus subscriber is registered in the master and indicated via a common diagnosis.

Status indication

Status indivation via 4 LEDs

Standardization

Terms, Definitions and Abbreviations

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)