Product Overview
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ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
1.1 What are distributed I/O devices?
Distributed I/O devices – usage
When a system is set up, the inputs and outputs to and from the process are often
located centrally in the programmable controller.
If there are inputs and outputs at considerable distances from the programmable
logic controller, there may be long runs of cabling which are not immediately
comprehensible, and electromagnetic interference may impair reliability.
The use of distributed I/O devices is suitable for such systems:
The controller CPU is located centrally.
The I/O devices (inputs and outputs) are operating locally on a distributed
basis.
The high-performance PROFIBUS-DP ensures with its high baud rates that the
controller CPU and I/O devices communicate smoothly.
What is PROFIBUS-DP?
PROFIBUS-DP is an open bus system complying with IEC 61784-1:2002 Ed1 CP
3/1 with the ”DP” transmission log (DP stands for Distributed Peripheral).
Physically, PROFIBUS-DP is either an electrical network based on a shielded
two-wire line or an optical network based on a fiber-optic cable.
The ”DP” transmission log allows a rapid, cyclic exchange of data between the
controller CPU and the distributed I/O devices.
What are DP masters and DP slaves?
The link between the controller CPU and distributed I/O devices is the DP master.
The DP master exchanges data by means of PROFIBUS-DP with the distributed
I/O devices and monitors PROFIBUS-DP.
The distributed I/O devices (= DP slaves) prepare the data of the sensors and
actuators so that it can be transferred via PROFIBUS-DP to the controller CPU.
What devices can be connected to PROFIBUS-DP?
Different devices can be connected on PROFIBUS-DP as DP masters or DP
slaves provided they behave in accordance with the IEC 61784-1:2002 Ed1 CP 3/1
standard. You can use devices from the following product families amongst others:
SIMATIC S5
SIMATIC S7/M7/C7
SIMATIC programmer/PC
SIMATIC HMI (operator interface OP, OS, TD)
Devices from other manufacturers
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