System Introduction
2–4
1070 072 262-101 (01.09) GB
2.1.2
PROFIBUS-DP and DP/V1
For peripheral inputs and outputs, only fieldbus systems, like e.g. PROFI-
BUS-DP are used.
PROFIBUS is an open, non-proprietary fieldbus standard with a wide ap-
plication range in manufacturing and process automation. The EN 50170
and EN 50254 international standards guarantee the fieldbus’ indepen-
dence from the manufacturer and its openness. PROFIBUS makes com-
munication among devices of different manufacturers possible without
special interface adaptors. PROFIBUS is suitable for fast and time-critical
applications as well as complex communication tasks.
The PLC communicates with the decentralized bus stations (I/Os) via the
”On-Board” busmaster (EN 50 170).
The busmaster converts the in- and output signals of the PLC into a serial
data stream for the PROFIBUS-DP/V1 and monitors the data traffic towards
the bus stations. The data exchange with decentralized bus stations (slaves)
is cyclic. The master reads the input information from the slaves and writes
the output information to the slaves.
The monomaster system configuration allows for the realization of one class
1 busmaster per PLC. The class 1 master processes the user data traffic with
those slaves that have been assigned to it. It serves the following master -
slave application functions in the DP profile:
D
Cyclic user data exchange
D
Acquisition of diagnostic information of the DP slaves
D
Parameterization and configuration of a maximum of 124 DP slaves
D
Control of the DP slaves via control commands
The extended V1 profile realizes the additional master - slave function:
D
Acyclic reading/writing
.
For further information regarding the operation of the decentralized
peripherals via PROFIBUS-DP, please refer to the WinSPS and WinDP
online help.
Содержание CL550
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