Pepperl+Fuchs KFD Series, Руководство пользователя

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HART Multiplexer System KFD*-HM*-16
Commissioning
5.2.5 Device Parameters, Parameterization
For the identification and parameterization of the multiplexer master, just like other
HART field devices, the multiplexer master contains certain parameters that are saved in
the non-volatile memory. The following list shows these parameters and how the
parameterization must be performed.
•
Unique device identification, see commands 0 and 11
The device identification provides information about the device (type, type ID,
serial number, revision numbers) and the manufacturer and cannot be changed.
• Message, see commands 12 and 17
Under this parameter, any text of up to 32 characters can be stored in the device.
• Tag, description, and date, see commands 13 and 18
A tag (8 characters), a measuring point description (16 characters), and a date can be
stored under these parameters.
• Number of preambles in message responses, see command 59
This parameter is used to define the number of preambles inserted in the message
responses. The default setting is 4, the adjustment range is 2 to 20.
• Number of message repeats, see commands 144 and 145
The number of message repeats can be set separately for repeats in the event of
communication faults and in the event of response code Busy . The adjustment range is
0 to 11 repeats in each case. In the event of communication faults, the default setting is 2.
For response code Busy , the default setting is 0.
• Scan command, see chapter 7.1.7 and commands 146 and 147
Of the existing scan parameters, only the scan command is stored in non-volatile memory.
The command indicates which HART command (1, 2, or 3) is to be a scan command to
the field devices.
• Master type (primary or secondary master), see command 151
This sets the priority for access to the HART field device. A primary master always initiates
a connection to a field device. A secondary master initiates a connection to a field device
only if the primary master does not access the field device. The default setting for
the multiplexer master is primary master. A typical example of a secondary master is a
handheld.
• Loop search type, see command 153
The multiplexer master currently does not support multidrop with HART, i. e., only one
HART field device is connected to each HART channel. During construction of the
signal loop (scanning process, see chapter 7.1.5), the connected field devices are either
always searched for polling address 0 ( single analog ) or for polling addresses 0 to 15
in preparation for multidrop operation. In multidrop operation, the first polling address
found is addressed ( single unknown ).
• Module table, see chapter 7.1.2 and command 157
This document includes a list of commands. See chapter 9.1.
Caution!
Potential device malfunction from change of device function
Changes in the device function can lead to device malfunction. The function of the device
is no longer guaranteed.
Before transferring the new device function, make sure that the changed device function
does not cause a danger to the device and the plant.