Pepperl+Fuchs VAA-2E-G4-SN Instruction Manual page 18

VAA-2E-G4-SN
Assignment of the connections
Category 3
The occurrence of an error must not result in loss of the safety function
(Category 3).
• Connection of two independent mechanical switches of Category 3:
Since a short-circuit over the switch is not detected, the lines between
the safety slave and the switch must be laid with protection against
mechanical damage. The switch must be positively driven so that it is
not possible for the contacts to become fused together.
The following functional devices can be used in this application while
operating the AS-Interface safety slave together with a safety monitor
type VAS-1A-K12-U or VAS-2A-K12-U to meet the requirements of
Category 3:
18
Subject to reasonable modifications due to technical advances.
Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com
mechanical
protected
1.1
S+1
Channel 1
1.3
S-1
mechanical
protected
2.1
S-2
Channel 2
2.3
S+2
Two channels dependent
Two channels independent
Copyright Pepperl+Fuchs, Printed in Germany