Application examples for conventional PSRclassic safety relays
102597_en_03 PHOENIX CONTACT 93 / 136
Function description
For additional diagnostic descriptions, please refer to Section 8.
Notes on theapplication
example
1. The light grid (ESPE) must meet type 4 requirements of standard EN 61496-1.
2. Make sure that the signal generator (e.g., light grid) and the safety relay have the same
ground potential.
3. Contactors K3 to K8 have mirror contacts in accordance with EN 60947-4-1.
4. Stop category 0 describes an immediate stop by removal of power by interrupting a
machine or drive element in accordance with EN 60204-1.
5. When using the safety relay, take into consideration the maximum permissible number
of cycles for observing the SIL/PL safety characteristics in the specific application. The
safety characteristics can be found in the AH EN SAFETY CHARACTERISTICS appli-
cation note or the SISTEMA library.
Start Action Result Diagnostics
1. The light grid is active,
there is no object in the
protective field.
Both OSSD signals from the light grid provide HIGH signals
for enable circuit S12 and S22 of the safety relay.
Stop Action Result Diagnostics
1. The light grid is inter-
rupted, there is an object
in the protective field.
The safety function is triggered by the interruption of the light
grid and contactors K3 and K4 drop out.
K1
K2
K1
K2
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