Pilz PSEN op4B-S-3-080 - Manual (Page 14)

PSEN op4B Series Operating Manual
10
Also, under normal operating conditions, it must not be possible to
start the machine until the operator is outside the danger zone.
If it is impossible to install the safety light curtain in immediate
proximity to the danger zone, a second safety light curtain must be
installed and aligned horizontally, to exclude access from the side, as
shown in Fig. 4b.
Fig. 4a Fig. 4b
If the installation position of the safety light curtain still enables an
operator to access the danger zone without detection, an additional
mechanical barrier must be installed to prevent this.