KROHNE MFC 300 EN - Manual (Page 153)

DESCRIPTION OF HART INTERFACE
9
153
MFC 300
www.krohne.com 02/2012 - 4000498602 - MA MFC 300 R03 en
For the dynamic variables connected to the linear analogue outputs for current and/or
frequency, the assignment of the device variables takes place by selecting the linear
measurement for these outputs under the appropriate function of the signal converter. It follows
that the dynamic variables connected to current or frequency outputs can only be assigned to the
linear HART
® device variables.
The HART ® dynamic variable PV is always connected to the HART ® current output.
A totalizer device variable can thus not be assigned to the dynamic variable PV because the PV is
always connected to the HART
® current output.
Such correlations do not exist for dynamic variables not connected to linear analogue outputs.
Both linear and Totaliser device variables can be assigned.
The totaliser device variables can only be assigned to the dynamic variables SV, TV and 4V if the
connected output is not a current or frequency output.
9.5 Parameter for the basic configuration
There are parameters, such as Totaliser 1…2 (optional 3) and a selection of the diagnosis values,
that require a warm start for the device following data changes in order to update, for example,
dependent unit parameters before other parameters may be written.
Depending on the characteristic of the HART ® host system, e.g. online/offline mode, these
parameters are treated differently. See the following section for more detailed information.
Diagnosis 2 30 linear Available when diagnosis value 2 not
switched off.
Totaliser 1 (C) 6 Totaliser Valid for Basic I/O option only.
Totaliser 1 (B) 13 Totaliser Valid for Modular I/O and Ex i I/O options
only.
Totaliser 2 (D) 14 Totaliser -
Totaliser 3 (A) 12 Totaliser Valid for Modular I/O and Ex i I/O options
only.
HART ® device variable Code Type Explanations
.book Page 153 Monday, February 6, 2012 11:01 AM