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The point-to-point CP can also be inserted centrally in "Fault-tolerant system a". However, in
this configuration even the failure of the CPU, for example, will cause a total failure of
communication.
16.9.4
Custom connection to single-channel systems
Connection via PC as gateway
Fault-tolerant systems and single-channel systems can also be via a gateway (no connection
redundancy). The gateway is connected to the system bus by one or two CPs, depending on
availability requirements. Fault-tolerant connections can be configured between the gateway
and the fault-tolerant systems. The gateway allows you to link any type of single-channel
system (e.g., TCP/IP with a manufacturer-specific protocol).
A user-programmed software instance in the gateway implements the single-channel
transition to the fault-tolerant systems, and so allows any single-channel systems to be
linked to a fault-tolerant system.
Configuring connections
Redundant connections between the gateway CP and the single-channel system are not
required.
The gateway CP is located on a PC system which has fault-tolerant connections to the fault-
tolerant system.
To configure fault-tolerant S7 connections between fault-tolerant system A and the gateway,
you first need to install S7-REDCONNECT on the gateway. The functions for preparing data
for their transfer via the single-channel link must be implemented in the user program.
For additional information, refer to the "
Figure 16-14 Example of linking a fault-tolerant system to a single-channel third-party system
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
16.9 Communication via S7 connections
Industrial Communications IK10
Supplementary information
" Catalog.
245
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