General procedure for AOPD with right-angle approach (point of operation guarding and access guarding)

According to EN ISO 13855, not only is the direction of movement through the protective field to be taken into account, so too is the circumventing of the protective device by possibly reaching over or under. Consequently, the value S is to be calculated for both the safety distance with respect to reaching / walking through the protective field SRT (Reach Through) and with respect to reaching under / over SRO (Reach Over). The larger of the two values is to be used as the safety distance S.

For danger zone guarding with parallel approach, reaching under and over is already implicitly taken into account.