Communication Functions
8-8
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
8.3 Supported Communication Services
The following services can be used:
• S7 communications over fault-tolerant S7 connections via PROFIBUS and
Industrial Ethernet
• S7 communications over S7 connections via MPI, PROFIBUS and Industrial
Ethernet
• Standard communications (FMS, for example) via PROFIBUS
• S5-compatible communications (SEND and RECEIVE blocks, for example) via
PROFIBUS and Industrial Ethernet
The following are not supported:
• Basic communications
• Global data communication
8.4 Communications via Fault-tolerant S7 Connections
Availability of communicating systems
Fault-tolerant communications add additional, redundant communication
components, such as CPs and LAN cables, to the overall SIMATIC system. To
illustrate the actual availability of communicating systems when using an optical or
electrical network, a description is given below of the possibilities for
communication redundancy.
Prerequisite
A requirement for the configuration of fault-tolerant connections with STEP 7 is a
configured hardware installation.
The hardware configuration of the two subsystems integrated in a fault-tolerant
system must be identical. This is especially true of the slots.
Depending on the network being used, the following CPs can be used for
fault-tolerant communications:
• Industrial Ethernet:
S7: CP 443-1
• PROFIBUS:
S7: CP 443-5 Extended (not configured as DP master system)
To be able to use fault-tolerant S7 connections between a fault-tolerant system and
a PC, you must install the “S7-REDCONNECT” software package on the PC.
Please refer to the Product Information Leaflet on “S7-REDCONNECT” to learn
more about the CPs you can use at the PC end.
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