Io Redundancy - Siemens SIMATIC ET 200SP HA Equipment Manual

6.6

IO redundancy

Overview of IO redundancy
For the configuration of IO redundancy, you insert 2 F-DI 16×24VDC HA I/O modules of the same
type next to each other on a redundant block. You can find additional information on the possible
terminal blocks in section "Terminal blocks for the I/O module (Page 13)".
This terminal block connects the respective process signals of the two modules to a common
process terminal.
• The wiring work is lower compared to connecting separate I/O modules, because the
interconnection of the process signals is integrated into the system.
• The redundant signal processing of the sensors at module level increases the availability of
the system.
Note
IO redundancy is briefly described below.
You can find detailed information on this in system manual ET 200SP HA Distributed I/O System.
Configuration and use
For configuration and use of F-DI 16×24VDC HA I/O modules in IO redundancy, the following
requirements apply:
Selection of hardware:
• Redundantly used I/O modules must be identical. This means they must have the same article
number, the same firmware version, and a compatible hardware version.
Installation:
• I/O modules of the same type are plugged in pairs next to each other in the same redundant
terminal block (type "TB45R-P32").
IO redundancy:
• The master module must always be configured at an even slot, the slave module at the
following odd slot.
• The two redundant I/O modules operate simultaneously and independently. Both modules
generate diagnostics, interrupts, messages, process values, etc.
Configuration:
• Assign the redundancy parameters for the I/O module.
• The settings you make for an I/O module always apply to the module pair.
Response to failure
If an I/O module or a channel fails, the following applies to one of the two I/O modules:
• Error-free inputs remain available in the system.
F-DI 16x24VDC HA
Equipment Manual, 08/2021, A5E45647528-AD
Applications of the F-I/O module
6.6 IO redundancy
53