WARNING
Provisions for IO redundancy
• With a redundant conguration, you need to ensure that not only one I/O module is
permanently operated on the terminal block.
• When plugging a I/O module in a redundant conguration, you must ensure that you use
identical module types.
• The correct function of the diodes located in the terminal block and required for redundancy
switchover must be ensured at regular intervals. This can be achieved, for example, by the
discrepancy evaluation of the fail-safe channel driver from F-systems.
You can nd more information on discrepancy analysis in the description of the channel
driver in the "SIMATIC Industrial Software S7 F/FH Systems - Conguring and Programming
(https://support.industry.siemens.com/cs/ww/en/view/109773062)" Programming and
Operating Manual.
(FAIW-013)
Conguration:
• Assign the redundancy parameters for the I/O module.
• Settings that you make on a I/O module always apply to the module pair, with the exception
of the F-destination address.
Response to failure
In the event of a channel failure in the redundant I/O modules or one of the two I/O modules, the
following applies:
• Error-free inputs remain available in the system.
Applications of the F-I/O module
6.10 IO redundancy
F-AI 8xI 2-/4-wire HART HA
Equipment Manual, 09/2021, A5E50557845-AA 59
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