Siemens SIMATIC ET 200pro - 2 Product Overview; What Are Distributed I;O Systems

ET 200pro distributed I/O EtherNet/IP interface module
Manual, 03/2016, A5E32861915-AB
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Product overview
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2.1
What are distributed I/O systems?
When a system is set up, the inputs and outputs from and to the process are often located
centrally in the programmable logic controller.
If there are inputs and outputs at considerable distances from the PLC, there may be long
runs of cabling that are not immediately comprehensible. Additionally, electromagnetic
interference may impair reliability.
Using a distributed I/O system provides the following benefits:
● The controller CPU is located centrally.
● The I/O systems (inputs and outputs) operate locally on a distributed basis.
● The high-performance ET 200pro system ensures that the PLC and I/O systems
communicate smoothly.