1, D means Data , P means Positive, DP that is the positive data line.
2, DP bus, used in the field layer of high-speed data transfer point-to-point communication.
Expanded Information:
Used for high-speed data transfer at the field level. The master periodically reads input information from the slave and periodically sends output information to the slave. The bus cycle time must be shorter than the master (PLC) program cycle time. In addition to cyclic user data transfer, PROFIBUS-DP provides the non-cyclic communication required by intelligent devices for configuration, diagnostics and alarm processing. Diagnostics and alarm processing.
①Transmission technology: RS-485 twisted pair. Twisted pair cable or fiber optic cable. Baud rate from 9.6K bit/s to 12M bit/s.
②Bus Access: Token transfer between masters, master-slave transfer between masters and slaves. Supports single or multi-master system. Maximum number of stations (master-slave devices) on the bus is 126.
③Communication: Point-to-point (user data transfer) or broadcast (control commands). Cyclic master-slave user data transfer and acyclic master-master data transfer.
④Operation modes: Run. Clear. Stop.
5 Synchronization:Control commands allow inputs and outputs to be synchronized. Synchronization Mode:Output Synchronization; Lock Mode:Input Synchronization.
6 Function:Cyclic user has data transfer between DP master and DP slave. Dynamic activation and activation of each DP slave. checking of DP slave configuration. Powerful diagnostic function with three levels of diagnostic diagnostic information. Synchronization of inputs or outputs. Addressing of DP slaves via the bus. Configuration of the DP master (DPM1) via the section line with a maximum of 246 bytes of input and output data per DP slave.
7 Reliability and protection mechanisms: All information is transmitted over a distance of HD=4. DP slaves are equipped with a watchdog timer. Access protection for input/output of DP slaves. user data transmission monitoring with variable timer on DP master.
⑧ device type: the second type of DP master (DPM2) is programmable. Configuration. Diagnostic equipment. The first type of DP master (DPM1) is the central programmable controller, such as PLC, PC, etc. DP slave is a drive with binary values or analog inputs and outputs. Valves, etc.