Fault-Tolerant Solutions In Pcs 7; Solutions For The I/O - Siemens SIMATIC PCS 7 Function Manual

Fault-tolerant Solutions in PCS 7

3.1

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 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
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 PCS 7 via the bus system.
HART devices are connected and addressed via the corresponding modules in the (ET 200M /
ET 200iSP) distributed I/O. HART devices are actuators and sensors that can be configured
per HART protocol (HART: Highway Addressable Remote Transducer).
Network components that are integrated at the fieldbus belong to the distributed I/O. These
include, for example, the following network components:
● DP/PA-Link
The DP/PA‑Link enables the connection of a lower-level bus system such as PROFIBUS
PA to a redundant PROFIBUS DP.
● Y-Link
With the Y-Link, you connect singular PROFIBUS components to a redundant system.
● FF-Link
The FF-Link enables the connection of a lower-level bus system such as Foundation
Fieldbus to a redundant PROFIBUS DP.
● PROFINET switches
With the PROFINET switches, you integrate PROFINET networks in the fieldbus of an AS.
An AS interface can be connected using AS-Interface master modules (CPs) that are used in
the distributed I/O device. This enables the connection of simple sensors and actuators to PCS
7 with AS-Interface. PCS 7 integrates other I/O levels in a project in this way.
Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA
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