IDENT-I • IVI-KHD2-4HB5, IVI-KHA6-4HB5
Installation
Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
D
a
te
of
is
su
e
2
6.
07
.2
0
0
1
20
5.4.3
Special connection information for the INTERBUS cable
Ring closure switch
A key feature of the INTERBUS system is its physical ring structure. Each connected
unit lies in the bus between two other stations. If this is not the case, e.g. a bus termi-
nal at the end of a branch, the ring line in the affected unit must be closed.
This ring closure takes place automatically when the Sub-D connections are used. If
the screw terminals on the IVI-KHD2-4HB5/IVI-KHA6-4HB5 are used to connect the
bus line, the rotary switch for the ring closure, labelled "S1", must be moved to the
appropriate position (see Figure 4.5). The ring closure switch is located on the top of
the unit.
Figure 5.6
Ring closure switch
The ring closure must only be activated at an open branch end! All
subsequent units will otherwise be cut off from communications.
0
1
S1
Rotary switch "S1" for
ring closure on
device top
Activate with a
suitable screwdriver
Bus forwarded
Ring closed
