High availability solutions in PCS 7
4
4.1 Solutions for the I/O
Introduction
In this section you will learn about the I/O systems and components that contribute to increasing
the availability of your system. This means using the distributed I/O in PCS 7.
Distributed I/O
Distributed I/O refers to modules (input/output modules and function modules) that are used
in a modular, distributed I/O device (such as the ET 200SP HA, ET 200M, ET 200SP or
ET 200iSP).
Distributed I/O devices are often spatially separated from the central rack and located in direct
proximity to the field devices themselves. This minimizes the requirements for wiring and
ensuring the electromagnetic compatibility. Communication connections between the CPU of
the automation system and the distributed I/O can be established with the following network
types:
● PROFIBUS DP
● PROFINET IO
In addition to the I/O devices, distributed I/O includes field devices such as actuators, weighing
systems, motor protection control equipment and all other field devices that can be integrated
in the plant via the bus system.
HART devices are connected and addressed via the corresponding modules in the distributed
I/O device. HART devices are actuators and sensors that can be configured per HART protocol
(HART: Highway Addressable Remote Transducer).
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA 35
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