2TLC172255M0201, rev. D
6
Description of the different nodes
Non-safe node
All push-button boxes have a non-safe node to
control illuminated push-buttons. If a illuminated
push-button is replaced by another component.
The corresponding bit below should not be used.
Node
Bit
Bit value
Contact status
1
Bit 1
0
1
Contact 1 open
Contact 1 closed
1
Bit 2
0
1
Contact 2 open
Contact 2 closed
1
Bit 3
0
1
Contact 3 open
Contact 3 closed
1
Bit 4
0
1
Contact 4 open
Contact 4 closed
Safe nodes
The push-button boxes can also be equipped with
one or two safe nodes, for safety related functions
(emergency stop, safe key selector etc).
Node
Bit
Bit value
Contact status
1
1
0
1
open
closed
2
1
0
1
open
closed
The AS-i bus and the safety around it is specified by the two organizations
“AS-International Association” and “AS-
Interface Safety at Work”, and is described in the publication “AS-Interface The Automatic Solution”.
Warning!
All variants of Smile 41 AS-i normally needs to be complemented with other safety functions such as
interlocking guards etc. Refer to risk analysis.
NB: The emergency stop (Smile 41EWWWA AS-i and 41EKWWA AS-i) should not be used as normal stop of the
machine, only in case of emergency.
