KROHNE OPTIWAVE 5200 C_F EN - Manual (Page 124)

9
DESCRIPTION OF HART INTERFACE
124
OPTIWAVE 5200 C/F
www.krohne.com 07/2013 - 4001904902 - HB OPTIWAVE 5200 R02 en
9.3 Connection variants
The signal converter is a 2-wire device with 4...20 mA current output and HART ® interface.
• Multi-Drop Mode is supported Multi-Drop Mode is supported Multi-Drop Mode is supported Multi-Drop Mode is supported
In a Multi-Drop communication system, more than 1 device is connected to a common
transmission cable.
• Burst Mode is not supported Burst Mode is not supported Burst Mode is not supported Burst Mode is not supported
There are two ways of using the HART ® communication:
• as Point-to-Point connection and
• as Multi-Drop connection with 2-wire connection.
9.3.1 Point-to-Point connection - analogue / digital mode
Point-to-Point connection between the signal converter and the HART ® Master.
The current output of the device is passive.
Also refer to Point-to-point connection on page 53.
9.3.2 Multi-Drop connection (2-wire connection)
Up to 15 devices may be installed in parallel (this signal converter and other HART ® devices).
For an illustration of multi-drop networks, refer to Multi-drop networks on page 54.
For data on communication in multi-drop mode, refer to HART
® network configuration on page
78.
9.4 HART ® device variables
The HART® dynamic variables PV (Primary Variable), SV (Secondary Variable), TV (Third Variable)
and 4V (Fourth Variable) can be assigned to any of the device variables.
The HART ® dynamic variable PV is always connected to the HART ® current output which is, for
example, assigned to level measurement.
HART ® device variable
Code Type
level 1 linear
distance 2 linear
conversion 3 linear
ullage conversion 4 linear
reflection 5 linear