LUT400 Communications Options
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APPLICATION GUIDE
Information from a LUT400:
The LUT400 can be configured to provide a primary variable (PV) which is one of the following measures:
Level
Space
Distance
Volume
Flow
Head
The LUT400 can also provide four dynamic variables from the same list. These variables are read from the device using
HART
universal command 3
which some HART interface cards do automatically. Other HART cards will also automatically read the
device variables using HART universal command 9. The 6 variables in the list above are the 6 device variables of the LUT400.
NOTES:
to define the dynamic variables and the required order, use HART common practice commands 50 and 51.
This chart presents other variables from the LUT400 for selected monitoring and the corresponding HART command required to
read the values.
1
Variable HART Command
Daily total flow
Running (actual) total flow
Command 252: read totalizer parameters
Relay out (3)
Discrete In (2)
Command 216: read relay and DI states
Transducer temperature
Temperature sensor
Command 180: read temperature settings
Pumped hours Command 226: read relay pump
External totalizer Command 220: read external totalizer
High level alarm
Low level alarm
Command 198: read alarm parameters (transaction 1)
OCM max head
OCM max flow
OCM zero offset
OCM flow rate decimals
Command 248: read OCM flow information
Data logs can not be read through HART and are only available through the USB connection.
1
For more detail on the HART commands, see lit18_sitrans_lut400.pdf available on Siemens service and support:
http://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=en&objID=59217416&subtype=133300
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