Connection Example - Pilz PMCtendo DD5 Operating Manual

Function description
n
ENABLE
X3/12
STO-ENABLE
X4/5
Fig.: Safety function STO
4.3.3.3

Connection example

The following circuit example illustrates single-channel activation of the safety function
STO.
}
The drives are switched via a safety gate.
}
Safety gates S1/S2 are monitored by a safety relay PNOZ s3.
}
Shorts across contacts are detected.
}
The safety relay is wired for an automatic reset.
} The safety function STO complies with PL d (Cat. 2) of EN ISO 13849-1 and SIL CL 2
of EN/IEC 62061.
The relays' wiring must comply with the category or performance level required for the ap-
plication. Further information on the safety relays is available from Pilz.
24 V
A1 S11
PNOZ s3
A2
0 V
Fig.: STO with safety relay PNOZ s3
Operating Manual PMCtendo DD5
1002236-EN-04
1/s
U
U
S12 S21 S22 23
S12 S34 24
>400 s
m
S1
S2
X4
5
STO-ENABLE
24V
Servo Drive
t
t
t
1
3
0V
39