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Micro Motion
®
Model 3711 Gas Flow Computers
Modbus Interface
Figure 12-4
Modbus Configuration window – History Access Registers panel
6. This panel is used to define up to 10 history access registers. Each history access register is a
Modbus register that references a set of consecutive history points. For each history access
register that you will use, specify its Modbus register number, starting history point, ending
history point, archive type, and conversion code (see Table 12-3).
If you are unsure of your history point configuration, click
Configure > History Points
. For a
discussion of accessing history via Modbus communications, see Section 12.6.2.
Table 12-3
Modbus Configuration – History Access Registers parameters
Parameter
Description
Comments
Daily Index
Specify the register that contains the current index value (most
recently written) for daily history.
Default: 7160
Hourly Index
Specify the register that contains the current index value (most
recently written) for hourly history.
Default: 7161
Extended Index
Specify the register that contains the current index value (most
recently written) for extended history.
Default: 7162
Events/Alarms
Specify the register that will be used to access the event and
alarm log.
Default: 32
Register Number
Specify the Modbus register number to be used to access the
referenced history points.
Starting History
Point
The first history point to be referenced by the history access
register.
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