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2.1.9
LED indicators
The device has three LEDs, located on the front of the housing.
The meaning of these LEDs is given in the following table:
Colour
Red
Error indications (detected during the initialisation phase)
Green
Orange
During the initialisation phase, the green LED flashes, the other two are off.
During the REBUILD function, the green LED is ON and the orange flashes.
If all three LEDs flash one after the other, the DIP switch 1 (test) is in the "ON" position. Set the
switch to "OFF" and repeat the commissioning.
2.1.10
Device parameter, parameterisation
For the identification and programming of the multiplexer master, this contains - as do other HART field
devices - specific parameters that are in the non-volatile memory. The following list shows these parameters
and how the programming must be carried out.
•
Unambiguous device identification (see commands 0, 11)
The device identification provides information about the device (type, type-ID, serial number and revision
numbers) and the manufacturer and cannot be changed.
•
Message (see commands 12 and 17)
An arbitrary 32 character long item of text can be stored in the device under this parameter.
•
Tag, description and date (see commands 13 and 18)
A tag (8 characters), description (16 characters) and a date, can be saved under these parameters.
•
The number of preambles in message responses (see command 59)
This parameter is used to establish how many preambles are inserted in message responses. The pre-
setting is 4, the setting range is 2 ... 20.
•
Number of message repeats (retry) (see commands 144 and 145)
The number of message repeats can be separately set for the repeats in the case of communication
errors and for the response code "Busy" (see section 5.3.2).
The range of adjustment is 0.. .11 repeats. In the case of communication errors, the pre-setting is 2, in
the case of the response code "Busy" it is 0.
•
SCAN command (see section 2.1.6 and commands 146 and 147)
Of the available SCAN parameters, only the SCAN command is stored by non-volatile means. It signifies
which HART command (1, 2 or 3) is to be sent to the transmitter as the SCAN command.
•
Master type (primary or secondary master) (see command 151)
This controls the priority for access to the HART field devices. A primary master always initiates a con-
nection with a field device. A secondary master initiates a connection to a field device through an arbi-
tration function (i.e. only when the primary master does not achieve access). The pre-setting of the
multiplexer is "Primary Master". A typical example of a secondary master is a hand-held operating
device.
•
Loop type search (command 153)
At present, the multiplexer does not support a multidrop with HART, i. e. only one HART field device is
connected to each HART channel. With loop construction (REBUILD, see above )the connected field
devices are either always searched on the short address 0 ("single analogue"), or, in preparation for
multidrop, on the short addresses 0 ... 15, in which the first one found is addressed ("single unknown").
•
Module table (see section 2.1.6 and command 157)
•
Delay time on channel change (loop-switch delay) (see section 2.1.6 and command 161)
Subject to reasonable modifications due to technical advances.
12
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
Meaning
Operating indications
HART communication with a field device
HART Multiplexer Master KFD2-HMM-16
Copyright Pepperl+Fuchs, Printed in Germany
Product description
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