Communication
14.2 Basics and terminology of fault-tolerant communication
S7-400H
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System Manual, 03/2012, A5E00267695-11
If the active subconnection fails, the already established second subconnection automatically
takes over communication.
Resource requirements of fault-tolerant S7 connections
The fault-tolerant CPU supports operation of 62/46 (see the technical specifications) fault-
tolerant S7 connections. Each connection needs a connection resource on the CPU;
subconnections do not need any additional connection resources. On the CP, on the other
hand, each subconnection needs a connection resource.
NOTICE
If you have configured several fault-tolerant S7 connections for a fault-tolerant station,
establishing them may take a considerable time. If the configured maximum communication
delay is set too short, link-up and updating is canceled and the redundant system mode is
no longer reached (see section Time monitoring (Page 155)).
Each CPU provides the connection resources according to its configuration, which means
that a CPU 417-5H that was configured as CPU 412-5H only provides the connection
resources of a CPU 412-5H.
Содержание SIMATIC S7-400H
Страница 24: ...Preface 1 1 Preface S7 400H 24 System Manual 03 2012 A5E00267695 11 ...
Страница 46: ...Getting Started 4 5 Special layout features of SIMATIC Manager S7 400H 46 System Manual 03 2012 A5E00267695 11 ...
Страница 120: ...Memory concept 10 1 Overview of the memory concept of S7 400H CPUs S7 400H 120 System Manual 03 2012 A5E00267695 11 ...
Страница 258: ...Communication 14 8 General issues regarding communication S7 400H 258 System Manual 03 2012 A5E00267695 11 ...
Страница 354: ...Synchronization modules 18 3 Selecting fiber optic cables S7 400H 354 System Manual 03 2012 A5E00267695 11 ...
Страница 434: ...Technical data 20 6 Runtimes of the FCs and FBs for redundant I Os S7 400H 434 System Manual 03 2012 A5E00267695 11 ...
Страница 460: ...Function modules and communication processors supported by the S7 400H S7 400H 460 System Manual 03 2012 A5E00267695 11 ...