Safety engineering
Hardware revision
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EDS84ASC552 EN 10.0
10.6 Hardware revision
The integrated safety of the 8400 controllers is implemented with two hardware versions.
The previous hardware ...
ƒ has no labelling (up to ”1B”).
ƒ has t o be assigned to the data with the reference to HW revision: up to 1B.
The revised hardware ...
ƒ Is clearly labelled on the side with a sticker, e.g. ”HW: 2A”.
ƒ has t o be assigned to the data with the reference to HW revision: from 2A.
ƒ is functionally compatible with the previous hardware.
ƒ comes with changed technical data.
ƒ Revision 2A has a slightly lower PFH value (compared to the revision up to 1B).
Hence, the hardware requires approx. 0.9 % of the maximum PFH value of the total
safety chain. For all the other components of the safety chain, only 99.1 % (instead
of 100 % so far) of the PFH value is available. Although the PFH value given here is
negligible, we recommend a check of the executed calculation of the safety chain
and, if required, a correction of the safety-related parameters.
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