IDENT-I • IRI-KHA6-4.RX, IRI-KHD2-4.RX
Serial interface/DIP switches
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
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Bild 5.3:
Terminal block with connecting cables
Read head cable lengths up to 50 m or 100 m are possible if the following conditions
are satisfied:
up to 50 m read head cable:
2
cross sectional area of at least 4 x 0.25 mm
2
maximum resistance 78 Ohm/km
maximum capacitance 90 pF/m
(e.g. LIYC11C, Mukkenhaut & Nusselt MUNFLEX
C11Y)
up to 100 m read head cable:
2
cross sectional area of at least 4 x 0.5 mm
2
maximum resistance 37 Ohm/km
maximum capacitance 90 pF/m
With a cable length of 100 m, a series resistor of 82 Ohm must be fitted
in the cable connected to the 'Reset' terminal of the control interface
unit.
Since more EM interference can result with longer cable lengths, the
maximum cable lengths given above might not be possible for some
applications.
If leads with double shielding are used, e.g. metallic wire mesh and
metallic foil, they must be connected to each other using a low imped-
ance connection at one end of the cable.
Many noise impulses come from the supply cables, e.g. switch-on cur-
rent of a motor. For this reason, running the supply cables in parallel
with the data/signal cables, especially in the same cable duct, should be
avoided.
