ABB AC 800M User Manual page 19

Section 1 Introduction
Only the two protocol types DP and PA today are important for process automation
and are supported within the 800xA System.
Figure 1. The PROFIBUS family embedded in Industrial IT
PROFOBUS DP: the bus for the Decentralized Periphery
The PROFIBUS DP (RS485) is responsible for communication between the
Controller level of a process automation system and the decentralized periphery in
the field, also intrinsic safety (RS485-IS) via DP-Ex barriers into hazardous area.
One feature of PROFIBUS DP is its scalable high speed of transmission up to
12 Mbit/s.
PROFIBUS PA: extension for Process Automation
This PROFIBUS variant was developed for the process industry. PROFIBUS PA
interacts with a fix transmission rate of 31,25 kbit/s and is designed for connection
of bus-powered 2-wire field devices such as transmitters and actuators.
3BDS009029R5001 B
The PROFIBUS Protocols
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