Communication
14.6 Communication via fault-tolerant S7 connections
S7-400H
System Manual, 03/2012, A5E00267695-11
249
Configuration view = Physical view
You decide during configuration if the additional CPs are used to increase resources or
availability. This configuration is typically used to increase availability.
Note
Internal and external interface
Communication between fault-tolerant systems may only take place between internal
interfaces or external interfaces (CP). Communication between internal interface and CP is
not possible.
Response to failure
If a duplex fiber-optic ring is used, only a double error within a fault-tolerant system (e.g.
CPUa1 and CPa2 in one system) leads to total failure of communication between the
systems involved (see first figure).
If a double error (e.g. CPUa1 and CPb2) occurs in the first case of a redundant electrical bus
system (see second figure), this results in a total failure of communication between the
systems involved.
In the case of a redundant electrical bus system with CP redundancy (see third figure), only
a double error within a fault-tolerant system (e.g. CPUa1 and CPUa2) or a triple error (e.g.
CPUa1, CPa22, and bus2) will result in a total failure of communication between the systems
involved.
Fault-tolerant S7 connections
Any disruption of subconnections while communication jobs are active over fault-tolerant S7
connections leads to extended delay times.
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 ...