Using I/Os in S7–400H
13.5 Other options for connecting redundant I/Os
S7-400H
212 System Manual, 03/2012, A5E00267695-11
Monitoring times during link-up and update
NOTICE
If you have made I/O modules redundant and have taken account of this in your program,
you may need to add an overhead to the calculated monitoring times so that no bumps
occur at output modules (in HW Config -> Properties CPU -> H Parameter).
An overhead is only required if you operate modules from the following table as redundant
modules.
Table 13- 8 For the monitoring times with redundant I/O
Module type Overhead in ms
ET200M: Standard output modules 2
ET200M: HART output modules 10
ET200M: F output modules 50
ET200L–SC with analog outputs ≤ 80
ET200S with analog outputs or technology modules ≤ 20
Follow the steps below:
● Calculate the overhead from the table. If you use several module types from the table
redundantly, apply the largest overhead.
● Add this to all of the monitoring times calculated so far.
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