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2
Product description
2.1
HART multiplexer master
2.1.1
Delivery package
Included in the delivery package of the device are:
•
One device KFD2-HMM-16
•
One product supplement (manual, data sheet, installation instruction)
2.1.2
Accessories/Product family
In addition to the HART multiplexer master, the following items from the HART multiplexer system family of
products are available from Pepperl+Fuchs:
•
KFD0-HMS-16, HART multiplexer slave, for extending the HART channels
•
KSD2-HC, HART RPI control module, for connecting the HART multiplexer to the RPI product family
K-HM14, cable master ↔ slave, for connecting the master with the slaves
•
•
FI-***, HART flexible interface, handover interface of the analogue signals between transmitter, multiple-
xer and PLC/DCS (control system specific)
•
MB-***, motherboard, carrier board for Ex-isolator module
K-HM26, cable master/slave ↔ FI-***/MB-***, for connection of master/slave with flexible interface FI-***
•
or motherboard MB-***, respectively
Interface converter RS 485 ↔ RS 232 (Telebyte Model No. 285), converter RS 485 ↔ RS 232,
•
Pepperl+Fuchs order code: Telebyte Model 285M
The complete product family is described in the Pepperl+Fuchs product catalogues.
Please refer to the ordering instructions detailed in the catalogues.
2.1.3
Description of the hardware
The HART multiplexer can operate up to 256 analogue transmitters. The built-in slave unit operates the first
16 loops, and a maximum of a further 15 KFD0-HMS-16 slaves can be connected.
The external connections are shown in Figure 2.1 and Figure 2.2.
The power supply (2 4 VDC nominal voltage) is provided via the power rail or terminals 17 and18. The op-
tional slave units or the RPI control module are connected with the master via a 14-core flat cable (K-HM14).
Its connector is placed on the same housing side as the terminals for the R S485 interface and the voltage
supply. The analogue signals for each unit are connected separately via a 26-core cable. 16 leads are pro-
vided for the HART signals of the analogue instrument circuits, the other 10 are connected to ground. The
minimum load resistance of the analogue instrument circuits is 2 30Ω (min. load resistance in accordance
with the HART specification), the max. load resistance is 5 0 0 Ω. Load resistances of up to 1000 Ω are pos-
sible, however, resistance values greater than 500 Ω can interfere with the HART communication. The con-
nector for these connections is located on the top of the housing. A process control system or a PC can be
connected via a RS485 interface (terminals 13, 14 and 15). Up to 31 KFD2-HMM-16 can be operated on
one RS 485 interface. Terminals 19, 20 and 21 can be used to connect additional stations to the R S485
interface. The DIP-switch on the housing front is for the setting of the R S485 address and the baud rate.
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
HART Multiplexer Master KFD2-HMM-16
Copyright Pepperl+Fuchs, Printed in Germany
Product description
7
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