Triggered Registers
The Scanner 3100 triggered registers store volumes, averaged values, and flow times since the last triggered archive was
captured. The Scanner 3100 can be configured via the web interface to automatically create triggered archives based on
a variety of modes (log on real time period, periodically, on device alarm, or on digital output) or to support PID tun-
ing when an analog output is configured as a PID controller. Via Modbus, a user can also manually publish a triggered
archive by writing a value of 500050 to the command register. See
for details and addi-
tional triggered archive commands.
Interval/Daily/Event Pointer Registers
These registers provide an index of the last record that was stored in the log data. These values start at 1 and increment
with each newly created log. When the maximum number of records is reached, the pointer resets to 1 and starts incre-
menting again.
Device Status
The Scanner 3100 provides 32 user-configurable alarms that can be assigned to a wide variety of system, device, and
flow parameters. These selections includes alarm status and diagnostic information such as input status and calculation
status. Alarms can be defined as low alarms, high alarms, or configured with both low and high setpoints.
A bit value of 1 indicates an alarm condition.
For details on configuring an alarm, see the Scanner 3100 Web Interface User Manual.
Units
Scanner 3100 holding registers allow users to read data in terms of measurement units specified by the installed Modbus
map. These units are different from Scanner 3100 base units. See
Appendix A—Unit Conversion Table, page A-1
, for a
list of common base units and the scale factors for converting them to other user-specified units.
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Scanner 3100 Modbus Protocol
Section 2
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