Rockwell Automation 2711 PanelView 550/900 Profibus Communications User Guide - Manual (Page 3)

PROFIBUS DP Communications 3
Publication 2711-6.3
The following sections describe:
•
introduction to PROFIBUS DP
•
communication between DP Masters and DP slaves
•
PROFIBUS DP products available from Allen-Bradley
PROFIBUS DP is the performance-optimized version of
PROFIBUS. It is a remote I/O protocol designed for high-speed data
transmission between automation systems and distributed
peripherals, such as remote I/O chassis or operator interface panels.
PROFIBUS DP is most useful for time-critical communication.
There are two main devices on the PROFIBUS DP network: the DP
Master(s) and DP slave(s). The DP Master acts as a requester of data
from the DP slaves. A DP Master of controller type (Class 1) may
also act as a responder to requests made from a DP Master of
management type (Class 2).
The DP slaves act only as responders to a DP Master, implementing
a defined set of functions. These functions are:
•
data exchange
•
check configuration
•
set parameters
•
read diagnostics
•
get configuration
•
global control (see Attention below)
•
read output
•
read input
•
set slave address
➀
➀
Not supported by the PanelView terminal.
!
ATTENTION: Only Clear Data global control is
supported by the PanelView terminal.
Overview of PROFIBUS DP
Introduction to
PROFIBUS DP