Pilz PSEN op2 Série Manuel D'utilisation page 82

Operating Manual
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Both muting inputs must be activated by two or four muting sensors
which have been properly connected and positioned to ensure that
personnel are not exposed to unwanted muting activations or
hazardous situations.
If you are using the muting function you will also need to connect
the external muting control lamp (muting lamp), otherwise it will not
be possible to activate this function.
Should the muting lamp not be connected, activating muting or
override would cause the safety contacts to open and the device
would be disabled on account of a muting lamp malfunction
(see Ch. 7.4 "Error messages and diagnostics").
Fig. 23 shows the muting operating modes.
MUTING OFF
SAFE
SAFE
OSSD ON OSSD ON
29
PSEN op 2/4 Series
Lamp flashes when
muting is active
MUTING ON MUTING OFF
SAFE
OSSD ON
Fig. 23