Siemens SIMATIC S7-400H - Example of Redundancy with Fault-Tolerant System and Redundant Ring; Example of a Fault-Tolerant System with Additional CP Redundancy

Communication Functions
8-11
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
CPUb2
CPUb1
CPUa2
CPUa1
CPa1
CPa2
CPb1
CPb2
OLM/
Bus1
2oo2 redundancy
OLM/
Bus2
CPU
a1
CP
a1
Fault-tolerant system a
CPU
b1
CP
b1
Fault-tolerant system b
OLM
OLM
OLM
OLM
System bus as optical two-
fiber ring
Redundancy
block diagram
Fault-tolerant
system a
Fault-tolerant
system b
Figure 8-3 Example of redundancy with fault-tolerant system and redundant ring
Fault-tolerant system a Fault-tolerant system b
Bus 1
Bus 2
CPU
a1
CP
a1
CPU
b1
CP
b1
CPUb2
CPUb1
CPUa2
CPUa1
CPa1
CPa2
CPb1
CPb2
Bus 1
Bus 2
Redundancy
block diagram
Fault-tolerant
system a
Fault-tolerant
system b
Figure 8-4 Example of redundancy with fault-tolerant system and redundant bus system
CPU
a1
CP
a11
CP
a22
Fault-tolerant system a Fault-tolerant system b
Bus 1
Bus 2
CPU
a1
CP
a11
CPUa1
Redundancy
block diagram
Fault-tolerant
system a
Fault-tolerant
system b
CP
a12 CPU
a1
CP
a11
CP
b22
CPU
b1
CP
b11
CP
b12
CPa11
CPa12
CPUa2
CPa21
CPa22
Bus 1
Bus 2
CPb11
CPb12
CPb21
CPb22
CPUb1
CPUb2
Figure 8-5 Example of a fault-tolerant system with additional CP redundancy