Supplementary information
18.10 Communication via S7 connections
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
329
connection redundancy. In the user program, both connections require the implementation of
monitoring functions in order to allow the detection of failures and to change over to the
standby connection.
The following figure shows such a configuration.
Figure 18-12 Example of redundancy with fault-tolerant systems and a redundant bus system with
redundant standard connections
Double errors in the fault-tolerant system (i.e., CPUa1 and CPa 2) or in the standard system
(CPb1 and CPb2), and single errors in the standard system (CPUb1) lead to a total failure of
communication between the systems involved (see previous figure).
Communication via point-to-point CP on the ET 200M
Connection via ET 200M
Links from fault-tolerant systems to single-channel systems are often possible only by way of
point-to-point connections, as many systems offer no other connection options.
In order to make the data of a single-channel system available to CPUs of the fault-tolerant
system as well, the point-to-point CP, i.e., CP 341, must be installed in a distributed rack
along with two IM 153-2 modules.
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