KROHNE VFM 1091 - Manual (Page 24)

6.2.13 Functions through HHC
The special functions which are accessible only through HART ® communicator include Device Information and
Multidrop Operation
DEVICE INFORMATION
This is used to identify the devices in the field. This is stored in the device and shown to you on request but has no effect
on the functionality of the flowmeter. None of these parameters are used for computational purpose during the
measurement.
Manufacturer :
This is a factory-programmed name. For VFM1091 (I) the manufacturer is KHRONE
MARSHALL.
Tag : The maximum number of characters allowed for tag is eight. Tag can be
effectively used to distinguish between different flowmeters in the field.
Descriptor : This parameter provides 16 characters which can be used to store more
descriptive data of a flowmeter.
Message : This provides 32 characters. This may be used for identification or display
of other important information regarding the flowmeter.
Revision Numbers: These are factory programmed and cannot be changed by the user.
Universal Rev - Gives the HART ® Universal command revision which the flow
meter should conform to.
Transmitter Rev - Gives the revision for the device specific VFC091 model.
Software Rev - Gives the internal software revision.
Hardware Rev - Gives the revision number for the hardware.
Final Assembly - Refers to the factory set value of the electronic assembly.
Device ID - Gives unique identifier for transmitter.
MULTIDROP CONFIGURATION
In multidrop configuration, upto 15 flow meters can be connected to a single communications transmission line. If the
device is configured for multidrop operation, the current output is parked to the minimum value (4mA) and the
communication occurs digitally between the flowmeters and the control system. Since the speed of communication for
HART
® is not fast enough for control applications, update rate should be considered before multidroping the flowmeters.
The other factors like the number of different models used the transmission line specifications, safety considerations etc.
should also be taken into account. In multidrop mode, the control system/communicator identifies each of the devices by
means of the polling address which can be programmed into the device.
POLL ADDRESS
This gives the identification number for the flowmeter in multidrop mode. The value of the number should be between 1
and 15. Please note that the flowmeter should be in loop mode while entering the poll address. Use Generic Online Menu
1,4, 3, 4, 1 to change the polling address of the meter.
MODEM
MULTI-DROP CONFIGURATION
PC HHC P/U VFM4000
RS232
R
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