Pepperl+Fuchs KLD2-PR-Ex1.IEC. Manual page 19

Power repeater / power supply according to IEC 61158-2
Power supply
Figure 5.3: Use of power supplies on the FOUNDATION Fieldbus
The field bus power supplies have a field bus terminator that cannot be
turned off. For this reason, the power supply must always be connected
at the beginning or end of a transmission line.
The power supply must always be connected on the physical end of a transmission
line. The maximum distance to the next node depends on the number of field devices
connected in this bus segment. The following table shows an overview of permissible
stub lines.
Number of field
devices
1 - 12
13 - 14
15 - 18
19 -24
25 - 32
The line lengths specified above apply exclusively to non-Ex applica-
tions
Note the definition of spur length on
Table 2 applies with the prerequisite that exactly one field device is connected to a
spur. If more field devices are connected on a spur, the line lengths must be reduced.
You should also take into consideration that the total length of the field bus system is
calculated as follows:
Subject to reasonable modifications due to technical advances.
Pepperl+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
Linking
Device
SPS
FOUNDATION Fieldbus H1 bus
max. permissible
spur length
120 m
90 m
60 m
30 m
1 m
FOUNDATION FieldbusGeneral
Power repeater
page 8
Copyright Pepperl+Fuchs, Printed in Germany 17