Product overview
1-2
ET 200eco Distributed I/O Station
A5E00158716-02
1.1
What are distributed I/O stations?
Distributed I/O systems – Field of application
Many systems are configured with a centralized process I/O system in the local
PLC.
Greater distances between remote I/O and the PLC can result in badly arranged
and extensive wiring. Also, electromagnetic interference may reduce reliabilty.
Plants of this type are suitable for operation with distributed I/O systems:
•
local controlling CPU
•
distributed I/O systems (inputs and outputs) operate at remote locations
•
the high–performance PROFIBUS-DP provides high data transmission rates for
trouble–free communication between the controlling CPU and the I/O systems.
What is PROFIBUS–DP?
PROFIBUS-DP is an open bus system according to the IEC 61784-1:2002 Ed1CP
3/1 standard with a “DP” transfer protocol (DP stands for distributed periphery, or
distributed I/O).
PROFIBUS-DP is physically an electrical network that is based on shielded twisted
pair cables or optical waveguide networking.
The ”DP” protocol allows fast, cyclic data exchange between the controlling CPU
and distributed I/O systems.
What are DP masters and DP slaves?
The DP master forms the interface between the controlling CPU and the
distributed I/O system. The DP master exchanges data with distributed I/O
systems via PROFIBUS-DP and monitors the PROFIBUS DP.
Distributed I/O systems (= DP slaves) prepare sensors and actuator data locally
for their transfer to the PLC via PROFIBUS DP.
Which devices can I connect to PROFIBUS-DP?
A wide range of devices can be connected on the PROFIBUS-DP as DP masters
or DP slaves, provided that they operate in accordance with IEC 61784-1:2002
Ed1 CP 3/1. Among others, devices from the following product families can be
used:
•
SIMATIC S5
•
SIMATIC S7/M7/C7
•
SIMATIC programming devices/PCs
•
SIMATIC HMI (operator control and monitoring stations OP, OS, TD)
•
Devices from other vendors
Содержание SIMATIC ET 200eco
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