Table of Contents
Advertisement
HART Multiplexer System KFD*-HM*-16
Commissioning
5.4.5
Device parameter, parameterization
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 9.1.3).
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 7.1.7 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 connection with a field device. A secondary Master initiates a
connection to a field device through an arbitration 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 7.1.2 and command 157)
•
Delay time on channel change (loop-switch delay) (see section 7.1.8 and
command 161)
27
Advertisement
Table of Contents
