Siemens SIMATIC CPU 410 System Manual page 77

This terminal block connects the respective process signals of the two IO modules to a
common process terminal.
● There is less wiring work compared to connecting separate I/O modules, because the
interconnection of the process signals is integrated in the system.
● The redundant signal processing of the sensors and actuators on the module level
increases the availability of the system.
● In redundant operation, the switching characteristics of the output modules that can
control the actuator in parallel are improved.
Application planning
Observe the following rules for configuring redundant I/O modules:
Hardware rule
● The I/O modules must be approved for redundant operation. You can find this information
in the manual for the respective module.
● Redundantly deployed I/O modules must be identical, i.e. they must have the same article
number, the same hardware version and the same firmware version.
Mounting rule
I/O modules of the same type are plugged in pairs next to each other in the same IO device.
● Both slots are located on the same support module.
● Both slots are located on the same terminal block (TB45R).
Note
Specific wiring
Always read the documentation of the I/O module used.
Configuring
● Configure redundancy for the I/O module.
The settings you make for an I/O module always apply to the module pair.
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
6.6 Versions of I/O connection to the PROFINET IO interface
I/O configuration variants
77