Emerson Rosemount 2460, Справочное руководство

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187
Modbus
®
Standard Question
Modbus
®
Standard Question
October 2018
Reference Manual
00809-0100-2460, Rev DE
Appendix F Modbus
®
Standard Question
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 187
FC02 Status register area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 188
FC03 register area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 190
FC04 register area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 191
User defined Modbus mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 199
F.1 Introduction
The Rosemount
™
2460 System Hub polls field devices and stores the information in input registers. This
allows Rosemount TankMaster and other host systems to read measurement data and status information
for a large number of tanks. This appendix lists the input registers which can be scanned in queries from
a Modbus master.
F.1.1 Priority
Polling will occur at certain intervals as specified in the table below:
Table F-1. Read interval
Priority Register Area Read interval in master
1 
Level
1 per second
2 
Average Temperature

Pressure
1 per 10 seconds
3 
Temperature Element

Density
1 per 30 seconds
4 
Free Water Level

Ambient Air Temperature

Ambient Air Pressure

Relay State
1 per 60 seconds
5 
Units

Diagnostic
1 per 120 seconds