Application examples using the modular safety relay system
102597_en_03
PHOENIX CONTACT
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 and K4 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.
The system behavior for category 4 permits that if a single fault occurs, the safety func-
tion is always executed and the single fault is detected on or before the next demand of
the safety function.
6.
The advantage of category 4 compared to category 3 is that an accumulation of unde-
tected faults does not lead to the loss of the safety function.
7.
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 pro-
tective field.
Both OSSD signals from the light grid provide HIGH sig-
nals to enable circuit S10–S12 of the safety relay.
2.
Press reset button S2.
Contactors K3 and K4 are activated and the mirror con-
tacts (N/C contacts of K3 and K4) in the reset circuit are
opened.
Stop
Action
Result
Diagnostics
1.
The light grid is interrupted,
there is an object in the pro-
tective field.
The safety function is triggered by the interruption of the
light grid and contactors K3 and K4 drop out.
In the reset circuit, the mirror contacts of K3 and K4 are
closed.
Power
IN 1
IN 2
K1
K2
Power
IN 1
IN 2
K1
K2
Power
IN 1
IN 2
K1
K2
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