KROHNE FMCW80G74TA ユーザーズマニュアル
9
DESCRIPTION OF HART INTERFACE
108
OPTIWAVE 7500 C
www.krohne.com
10/2016 - 4004375401 - MA OPTIWAVE 7500 R01 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.
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.
• 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 37.
9.3.2 Multi-Drop connection (2-wire connection)
Up to 63 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 38.
9.4 HART® device variables
The HART® dynamic variables PV (Primary Variable), SV (Secondary Variable), TV (Third Variable)
and QV (Fourth Variable) can be assigned to any of the device variables.
and QV (Fourth Variable) can be assigned to any of the device variables.
PDM version:
≥ 6.0
FDT version:
≥ 1.2
HART® device variable
Code
Type
sensor value
0
linear
level
1
linear
distance
2
linear
reflection
3
linear
level linearization
1
4
linear
volume conversion
2
5
linear
mass conversion
2
6
linear
distance linearization
1
7
linear
ullage volume conversion
2
8
linear
ullage mass conversion
2
9
linear
1 This HART® device variable is available if you created a linearization table in the conversion menu
2 This HART® device variable is available if you created a strapping table in the conversion menu
2 This HART® device variable is available if you created a strapping table in the conversion menu