Pilz PSEN op2H-s-30-180/1 - Manual (Page 31)

Instruction Manual PSEN op2H-s Series
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You may use for example a safety relay of the PNOZsigma (PNOZ
s4, PNOZ s5) range as an evaluation device. The wiring is described
in the operating manual of the PNOZsigma unit.
• Do not use varistors, RC circuits or LEDs in parallel at relay inputs
or in series at OSSD outputs.
• The OSSD1 and OSSD2 safety contacts cannot be connected in
series or in parallel, but can be used separately (Fig.16).
If one of these configurations is erroneously used, the device enters
into the output failure condition (see section 7 “Diagnostic
functions”).