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Product Overview
2
2.1
What are Distributed I/O Stations?
Distributed I/O Stations - Area of Application
When designing a system, the inputs and outputs from and to the process are often
installed in the programmable controller.
When the inputs/outputs are at a distance from the programmable controller, the
wiring involved can be extensive and confusing; electromagnetic interference can
also reduce the reliability.
In such systems, it is often advisable to use distributed I/O stations:
• the control CPU is located centrally
• the I/O devices are distributed on site
• PROFIBUS-DP allows high data transmission rates so that the control CPU and
I/O devices communicate both quickly and reliably.
• less installation effort since less cables are required.
What is PROFIBUS-DP?
PROFIBUS-DP is an open bus system complying with the IEC 61158/EN 50170,
Volume 2, PROFIBUS standard with the "DP" protocol (DP stands for distributed
(peripheral) I/O).
Physically, PROFIBUS-DP is an electrical network based on a shielded twisted pair
or an optical network using fiber optic cable.
The "DP" protocol allows fast, cyclic data exchange between the control CPU and
the distributed I/O devices.
What is PROFIBUS-DP Ex i
In contrast to PROFIBUS-DP, PROFIBUS-DP Ex i is intrinsically save (type of
protection intrinsically safe i). The intrinsic safety is assured by the use of a fieldbus
isolating transformer that acts like a safety barrier.
ET 200iS Distributed I/O Station
A5E00087831-02
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2-1
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