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Product Overview
1.1
What Is the ET 200 Distributed I/O System?
What Is the
ET 200?
What Does the
ET 200 Consist
Of?
S7-300M7-300
S7-400M7-400
ET 200L
Figure 1-1
A Typical PROFIBUS-DP Installation
PROFIBUS-DP
1-2
When a system is installed, the input/output modules are normally installed
centrally in the programmable logic controller.
If inputs and outputs are made at long distances from the programmable logic
controller, there may be long runs of cabling which are not immediately com-
prehensible, and electromagnetic interference may impair reliability.
In such systems, we recommend you to use the ET 200 distributed I/O sys-
tem:
The controller CPU is located centrally.
The I/O (input/output) system operates locally in a distributed fashion.
The ET 200 high-performance bus system ensures that the CPU and I/O
system communicate with each other without problems owing to its high
data transfer rates.
The ET 200 distributed I/O system consists of active (master) and passive
(slave) nodes that are interconnected via the PROFIBUS-DP.
S5-95U
ET 200M
ET 200B
PROFIBUS-DP (DP means distributed I/O) is an open bus system conform-
ing with EN 50170 Volume 2, PROFIBUS. The PROFIBUS-DP consists of a
DP master and DP slaves.
DP master: The link between the controller and the distributed I/O sys-
tem is the DP master. The DP master exchanges data with the distributed
I/O system over the PROFIBUS-DP and monitors the field bus.
DP slave: The I/O devices are connected as DP slaves. DP slaves process
data locally from the sensors and signal control elements in such a man-
ner that they can be transferred over the PROFIBUS-DP field bus.
ET 200L, ET 200L-SC and ET 200L-SC IM-SC Distributed I/O Device
S5-115U to 155 U
PU or PC
with IM 308-C
S5-95U
Other field devices
DP master
PROFIBUS-DP
DP slaves
EWA 4NEB 780 6009-02c
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