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Reference Manual
00809-0100-4832, Rev AA
October 2004
3-45
Rosemount 3095FC
NOTE
The Starting History Point and Ending History Point values must be different
with the Starting History Point value being the smaller of the two. The group of
history points is specified by the Modbus register value set in the Register
Number field.
8. Enter the Archive Type to archive either Hourly or Daily values.
9. Enter the Conversion field to specify the type of conversion required,
if any, on the data before it is sent to the Host or before it is written to
the 3095FC. The conversions are used to allow integer values
instead of floating point values to be transmitted and received.
Table 3-5 summarizes the applicable function calls and their
associated register and data fields.
Figure 3-27. Modbus History
Access Registers Screen
Modbus - Events / Alarms Functionality
The record formats for the Event log and Alarm log are the same size and
have similar contents. The first word in a record is a bit map in which bit 9
indicates if the log record is an Event (1) or an Alarm (0). The meanings of the
other bits are specific to either the event or the alarm log records. The Event
and Alarm log record consists of the bytes shown in Table 3-6. A breakdown
of the bit map in the first byte is given in the table immediately after the record
table.