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Universal IV™ CM Density Compensated Model
2.5 Modbus Validation (Continued)
Again, if you see the following locked into the DCM, Modbus is not communicating with
the DCM
Density --KG/M3--
If you see a density value on the DCM other than 830 KG/M3, data has been received.
If the received data does not match the Coriolis, check your address format!
2.5.4 Verify DCM density value matches Coriolis
If Coriolis is set to API and DCM is set to Density – the measurements may be correct –
you must ensure the PLC is providing the correct unit conversion. If the DCM will do all
the conversions, look at the settings for the scalers in STExplorer.
Do not change the DCM to output API until the DCM is set up and the first calibration
has been performed with oil flow in the system. This can be adjusted through Menu item
1.2
If they do not match, ensure the PLC is converting API to density. By default, the DCM
is set to density, but may be changed to API through menu 1.2.
2.5.5 When using the DCM as a Slave
This method is not recommended unless you have a dedicated PLC technician
or programer available. Refer to Modbus Register Maps, Section 3.6. Determine
appropriate Slave Register Address to write to.
Record units and values below.Utilize these register addresses when programing your
PLC
Density API
Density [
Temperature [ Deg
Volume Flowrate [
2.5.6 Calibrate.
Once the system is communicating, prepare system for calibration. Proceed to section
3.4.1 and perform 1st calibration point. A second calibration point should be performed
once you have a known deviation in API of product of at least 5 API. The greater the
change the better the DCM can compensate.
Temperature --DEGC--
830
Data
/
]
]
/ min]
25
Register
20
Flow --L/MIN--
0
Ensure the the
DCM menu 5.1 is
set to slave.
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