Rockwell Automation 1758-RTU202 DataSite Software User Manual FRN 1.2 - Manual (Page 324)

Publication 1758-UM002D-EN-P - October 2010
324 Enron Modbus Protocol for the 1758-FLO DataSite Controller
Register Addresses The following table lists the address ranges of the Enron registers that hold
short integers, long integers, and single precision floats.
1758-FLO DataSite
Variables A 1758-FLO DataSite controller supports up to eight meter runs.
Meter runs are configured individually. Gas quality is set for each meter run.
The following table lists the ranges of Enron Modbus variables used by the
controller.
Register address ranges
Range Data Type Description
32 Record Event/Alarm archive
(Event from 1…700, alarm from 701…1000)
701…716 Record Hourly/Daily archive
1001…2999 Boolean Reserved
3001…3450 Short integer 16 bits, high byte first
5001…5080 Long integer 32 bits, high byte fist, high word first. For example,
if the number 2,923,517,522 sent a 32-bit
unsigned integer, it would be AE 41 56 52.
7001…7800 Float 32 bits, IEEE single precision floating-point
number, high byte first, high word first. For
example, if the number 326,787 is sent as a 32-bit
float, it would be 48 9F 90 60.
Enron Modbus variable ranges
Purpose Hourly/Daily Archive Boolean Short Integer Long Integer Floating Point
System variables None None 3000…3050 None None
Meter run 0 701…702 None 3051…3100 5001…5010 7001…7100
Meter run 1 703…704 None 3101…3150 5011…5020 7101…7200
Meter run 2 705…706 None 3151…3200 5021…5030 7201…7300
Meter run 3 707…708 None 3201…3250 5031…5040 7301…7400
Meter run 4 709…710 None 3251…3300 5041…5050 7401…7500
Meter run 5 711…712 None 3301…3350 5051…5060 7501…7600
Meter run 6 713…714 None 3351…3400 5061…5070 7601…7700
Meter run 7 715…716 None 3401…3450 5071…5080 7701…7800