Function Description
Operating Manual PMCprotego D.48, PMCprotego D.72
1001735-EN-04
49
} The safety relay is wired for an automatic reset.
} The safety function STO complies with PLd (Cat.2) of ENISO13849-1 and SILCL2
of EN/IEC62061.
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.
PNOZ s3
A1
S11
STO1-ENABLE
STO2-ENABLE
S12
S21 S22
23
24S12 S34A2
X4
24V
0V
24 V
0 V
S1
S2
7
5
2
4
PMCprotego D
Fig.: STO, single-channel with safety relay PNOZ s3
4.3.3.7 Connection example for STO, dual-channel
The following circuit example illustrates dual-channel activation of the safety function STO.
} Activation of the inputs STO1-ENABLE and STO2-ENABLE is dual-channel, via the
semiconductor outputs from a safety control system PNOZ mm0p.
} The status of the pulse disabler is tested periodically by evaluating the two feedback
signals STO1-STATUS and STO2-STATUS from the safety control system.
} The safety function STO complies with PLe (Cat.4) of ENISO13849-1 and SILCL3
of EN/IEC62061.
The relays' wiring must comply with the category or performance level required for the ap-
plication. Further information on the safety control system PNOZmulti is available from Pilz.
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