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2.4
HART Multiplexer Slave
The HART multiplexer slave is supplied from the HART multiplexer master via the 14-core flat cable. The
contacting of the flat cable is provided via IDC connectors, so that the cable can be tapped at any position.
By this means, the power supply and data cables are looped on from station to station. The address 1 ... 15
is set via a 16-step rotary switch. Address 0 is reserved for the multiplexer master and must therefore not
be used. If a number of slaves are operated on the KFD2-HMM-16, different addresses must be assigned.
The sequence therefore plays no role in this.
The analogue signals are fed via a 26 core flat cable into the KFD0-HMS-16. 16 of these are intended for
the HART signal of the analogue instrument circuit (the remaining 10 are to ground) (for the assignment,
see section 6.2).
The minimum load resistance of the analogue measuring circuit is 23 0Ω (minimum load impedance in
accordance with HART specification), the maximum resistive load being 500 Ω. Load resistances of up to
1000 Ω are possible, however, resistance values greater than 50 0Ω can interfere with the HART commu-
nication.
2.5
Slave connection
HART multiplexer masters and slaves must be connected together via a separate K-HM14 flat cable.
The length of cable required should be stated when ordering. Hence the wiring of the HART multiplexer is
significantly simplified and the danger of wiring faults is excluded.
Subject to reasonable modifications due to technical advances.
20
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
Front View
Rotary switch
Housing type A1
(see system description)
HART Multiplexer Master KFD2-HMM-16
1
26
26 pin
Connector
14 pin
Connector
Copyright Pepperl+Fuchs, Printed in Germany
Product description
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