Pilz PSEN op2H Manuel D'utilisation page 62

Operating Manual
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Under no circumstances should safety outputs OSSD1 and OSSD2
be wired in series or in parallel (Fig. 15, 16, 17); both must be used
separately, as shown in Fig. 14. Should one of these two
configurations be used in error, a malfunction will occur (see Ch. 7,
"Diagnostic function").
Fig. 14
Fig. 16
21
PSEN op2H Series
Fig. 15
Fig. 17