Application Note PSSu Key-in-Pocket Extended
1006505-EN-01
│ 10/
4 Application description
4.1 Introduction
On a plant in which the danger zone is accessible via safety gates, "key-in-pocket" is a system that
guarantees that the plant cannot (re-)start until the last person has left the danger zone. Each person
who accesses the danger zone has to sign in to the key-in-pocket system’s internal sign in list. When
leaving the danger zone, each person must sign out of the internal sign in list. Transponders from
the authentication system PITreader from Pilz are used to sign in and out.
The example shows the application of the key-in-pocket system on a machine that executes
hazardous movements within a protective enclosure (protective grille and safety gate).
Figure 2: Danger zone
It is possible to enter or leave the danger zone via two access points, which are physically separate.
Within the danger zone there are two blind spots, which cannot be seen from the outside. On the
inside (within the danger zone), the gates also have devices to activate/deactivate guard locking, so
that it is possible to enter the danger via one of the gates and leave via the other. In this example,
the blind spots must be checked in a defined sequence.
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