Rockwell Automation 1758-RTU202 DataSite Software User Manual FRN 1.2 - Manual (Page 337)

Publication 1758-UM002D-EN-P - October 2010
Enron Modbus Protocol for the 1758-FLO DataSite Controller 337
Hourly and Daily History
Enron Modbus hourly/daily archive registers are used to read the hourly and
daily logs on the 1758-FLO DataSite controller. The records are read one at a
time.
Each hourly and daily record has a fixed length with 64 float data bytes in the
following format as shown in the table.
Meter run 7 data variables
Register Data Type Description
3401…3500 Short integer Meter run 7 data variables
•
Identical structure to meter run 0 data variables.
•
Offset by a value of 350.
5071…5080 Long integer Meter run 7 data variables
•
Identical structure to meter run 0 data variables.
•
Offset by a value of 70.
7701…7800 Float Meter run 7 data variables
•
Identical structure to meter run 0 data variables.
•
Offset by a value of 700.
Format of hourly and daily records
Field Size Type Description
Date 4 FLOAT Log date: MMDDYY.0
Time 4 FLOAT Log time: HHMMSS.0
P_avg 4 FLOAT Average pressure
T_avg 4 FLOAT Average temperature
DP_avg 4 FLOAT Average differential pressure or meter pulses
Gr 4 FLOAT Relative density
Flow time 4 FLOAT Run time yesterday
Volume_B 4 FLOAT Total volume at base conditions
Volume_F 4 FLOAT Total volume at flowing conditions
Volume_M 4 FLOAT Total mass
Extension 4 FLOAT Extension or uncorrected flow volume
Q Energy 4 FLOAT Energy
VAR1 4 FLOAT User defined variable