Pepperl+Fuchs KFD Series, Руководство пользователя

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HART Multiplexer System KFD*-HM*-16
Appendix
9.4 Glossary
Address
In communication systems, an address is used to identify the device to which a message is
addressed. HART uses two addressing modes: a polling address in the range 0 to 15 and the
extended address consisting of 38 bit. The polling address 0 is reserved for 4 mA to 20 mA
analog field devices in point-to-point connections. The polling addresses 1 to 15 are reserved
for field devices in multidrop connections.
Broadcast mode
See burst mode
Burst mode
A communication mode in which the multiplexer master instructs field devices to continuously
transmit process values
–
for example, the primary variable
–
to the multiplexer master without
further instruction. The multiplexer master recognizes and supports this mode but does not put
field devices in this mode itself.
Extended address
See Address
DTM
The DTM (DTM
–
D evice T ype M anager) contains all the data and functions of a device.
Every DTM contains its own user interface optimized for the device. The device and
communication DTMs can be integrated in any FDT frame application, such as PACTware .
The DTM offers almost no restriction with regard to display and user guidance. This means that
all available device functions can be operated according to the user's needs. Operation is
supported by graphics. The DTM technology enables consistent operation of a device in all
FDT systems.
Fuchs generates DTMs for HART-compatible devices by converting the
device description (DD) of these devices for use with PACTware .
Essentially, there are two different types of DTM:
•
Device DTMs
Device DTMs are DTMs for configuring field devices such as transmitter power supplies,
signal converters, and trip amplifiers.
• Communication DTMs
Communication DTMs are required for communication with a device via a point-to-point
connection or via any network structures. The communication DTMs are available for
various interfaces, such as an RS-232 interface or a USB interface.