Rockwell Automation 1441-PEN25-Z Enpac 2500 Data Collector - Manual (Page 84)

84 Rockwell Automation Publication GMSI10-UM002D-EN-E - August 2012
Chapter 2 Setting Up Measurements
Numeric (process) Measurement Definitions
Emonitor and the Enpac 2500 support numeric measurement definitions. This
topic lists the unique characteristics of the Enpac 2500 that you may need to
know when setting up and collecting numeric data.
Measurements Units Not Supported in the Enpac 2500 Data Collector
• You can make a numeric measurement definition for any available
measurement unit by setting Data Type to ‘Numeric.’
• Numeric measurement definitions with Input type set to ‘DC Coupled’
with units not supported by the Enpac 2500 map to units of USER (eus).
The input type is part of the transducer specification that you select for the
collection specification. This results in a process (DC) voltage
measurement in the Enpac 2500.
• For a list of support measurement units, see Measurement Units on
page 68 .
Full Scale Values for Numeric Measurements in the Enpac 2500 Data Collector
• The full scale value in the Enpac 2500 for a numeric measurement is
defined as ten times the value of the alarm or the baseline measurement.
• If no alarm or baseline measurement exists for the measurement in the data
collector, the Enpac 2500 assumes a full scale value of 10,000.
• A full scale value of 10,000 can be a problem if you want to enter a very
large or very small value for the numeric measurement. For example, you
can not enter a value greater than the full scale value. If you enter a value
that is very small compared to the full scale, the Enpac 2500 may round the
value off. If you enter 0.01 with a full scale value of 10,000, the Enpac 2500
stores it as a 0 (zero).
Temperature Measurements
• Set up a temperature measurement definition by setting Data Type to
‘Numeric’ and Units to ‘RPM,’ ‘CPM,’ or ‘deg. C.’
• Set up the temperature transducer in the Transducer Calibration dialog
with Input type set to ‘DC Coupled‘ and Units set to ‘deg. F’ or ‘deg. C.’
Make sure you enter the Calibration value that converts the voltage to a
temperature.
• Set up the collection specification to include a Signal detection of ‘RMS.’