ABB AC500-S Application note page 9

Application Note for "Usage of AC500 digital standard I/Os in functional safety applications up to PL c (ISO 13849-1)", V1.0.0
Figure 2. Relationship between Categories, DCavg, MTTFd of each channel and PL
from ISO 13849-1 with a focus on Category 2
Category 2 architecture based on ISO 13849-1 is shown in Figure 3.
Figure 3. Category 2 architecture from ISO 13849-1
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