KROHNE UFC 500 HART - Manual (Page 13)

HARTô Smart Communications Protocol
UFC500 Command Specification Rev: 2.0 Release Date: 9 Jun 2001
© 2001 KROHNE Mefltechnik D-47058 Duisburg Page 13
independent from the display units and hence are stored separately in the device EEPROM. Hence it is worth noting that
remote user mustnët expect any changes in data presentation on the device local screen when any units are changed
externally (from the HARTÆ bus).
It must be also noted that PV units are shared with configuration parameters having volumetric flow units (Full Scale,
sensor limits, etc.).
7.5 Command #48 Read Additional Transmitter Status
Reads 2 bytes of status data from the transmitter. Unlike Command #153, Read Error List, this command returns a
combined error list: some of them are actual at response time while the others are no more active but were not still
presented to master since the last ìQuitî action (Command #152).
In designations used Bit #0 corresponds to LSBit, Bit #7 - to MSBit.
Data byte #0:
Bit #7 Fuse error
Bit #6 Data error in EEPROM 2 (totalizer)
Bit #5 Current calibration values in EEPROM 1+2 are different
Bit #4 Current output overranged
Bit #3 Frequency/pulse output overranged
Bit #2 US path 2 faulted
Bit #1 Empty pipe
Bit #0 US path 1 faulted
Data byte #1:
Bit #7 Checksum error in ROM
Bit #6 Checksum error in RAM
Bit #5 NVRAM error
Bit #4 Calibration data lost
Bit #3 Data error in EEPROM 1 (parameters)
Bit #2 Irregular flow
Bit #1 Counts lost or totalizer overflow
Bit #0 Power failure
7.6 Command #50 Read Dynamic Variables Assignments
The possible mappings of Transmitter Variables into array of Dynamic Variables are already discussed in section 5.1,
Inputs/Outputs and Dynamic/Transmitter Variables. On startup Dynamic Variables are configured as follows:
Primary Variable Code - depends on the function of the current output and is either of {0, 4, 5}; variable setting. In
case current output is switched ìOffî (on startup or during normal instrument operation),
PV is set to FlowRate.
Secondary Variable Code - depends on the function of the frequency/pulse output and is either of {0, 4, 5, 6}; variable
setting.
Tertiary Variable Code = 1, PositiveTotalizer; permanent setting.
Fourth Variable Code = 2, NegativeTotalizer; permanent setting.
Output functions are available via Command #138, Read Analog Output Function.
NOTE: Command #51, Write Dynamic Variables Assignment, is not implemented. Primary/Secondary Variable Codes
are affected by Command #139, Write Analog Output Function. Therefore to provide consistency in device-master data
sets, Command #50 must be reissued after Command #139 is processed.
7.7 Command #53 Write Transmitter Variable Units