FloBoss™ S600+ Flow Computer Modbus Specification Manual
D301904X012
June 2024
24
If the data is 64-bit, the number of addresses per item must be set to either 1 or 4.
If the value is set to 1, the number of addresses contained in the poll is the number
of data items (in this case, the number of items and number of registers is the
same). If the number of addresses per item is 4, the number of addresses contained
in the poll is 4x the number of data items.
ADDRESSES PER ITEM may be set to –1 for some special data formats. This instructs
the Modbus message building code to ignore the number of registers requested.
This setting is typically used for Enron report data (where the number of registers is
used to define the report number, but the number of registers to be transmitted is
determined by the report layout). Refer to the Enron Corp document Specifications
and requirements for an Electronic Flow Measurement Remote Telemetry Unit (Revision
dated December 5
th
, 1994), for more details of this functionality.
Combinations of FORMAT and ADDRESSES PER ITEM commands should support the most
commonly used register formats. The ADDRESSES PER ITEM command must be followed
by a list of data points, each of which must occupy successive register addresses.
9.8 Discrete Data Point Format
Discrete data points appear in the Coils or Inputs section. All the data that makes up a
block is defined using a series of consecutive lines in the configuration file which refer to
objects in the FloBoss
S600+ database. Each line represents a point in the database. You
can add any number of lines to a block. Each block refers to successive coils or inputs.
The format of the line is:
<OBJECT_TYPE> <OBJECT_INDEX> <OBJECT_FIELD> < OBJECT_BITNO>
where:
<OBJECT_TYPE>, <OBJECT_INDEX>, and <OBJECT_FIELD> define a unique point in the
database using the object identification format used by the reports, display, and
communication configuration files. <OBJECT_BITNO> is the bit within the specified
database point which is mapped to the coil or input, such as:
ADC 3 MEASURED 0
Refer to the auto-generated slave configuration file (mbslave.txt) for many examples of
the format used.
9.9 Numeric Data Point Format
Numeric data points appear in the Register section. The data which makes up a block is
defined using a series of consecutive lines in the configuration file which refer to objects
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