Mosaic fieldbus modules
8540801 • 01/02/2017 • Rev.15 3
The bus module exports the system status and the status and diagnostic elements of all I/Os
configured on the Mosaic and enables 8 single fieldbus inputs to be imported.
The input and output memory maps are described in the tables at page 3.
The input map is made up by a single byte representing the fieldbus inputs.
The output map is made up by a status byte, a variable number of bytes for the Mosaic input
status, a byte representing the copy of the fieldbus inputs, a variable number of bytes to
represent the probes status, a variable number of bytes to represent the Mosaic OSSD status,
two bytes to represent the Mosaic diagnostics.
The system status is shown as one byte in which the bit 0 indicates whether the Mosaic is
online/offline and bit 1 indicates the presence of diagnostic elements.
Each input and each output (OSSD) configured on the Mosaic system is associated with two
information elements: status and diagnostic.
Status is a binary value, 0 or 1; diagnostic is a code indicating the condition of the I/O, and
indicates a problem on the I/O.
Each module with inputs has a number of bits corresponding to the number of physical inputs
that are present; thus modules M1, MI8, MI8O2 are associated with 1 byte (8 bit) and module
MI16, MI12T8 with 2 bytes (16 bit) for the inputs status.
All safety outputs are summarized in 1 or 2 bytes.
The inputs location varies according to the type of modules that are installed, in the following
order: If several modules of the same type are installed
the order follows the node number.
The byte that represents the state of the inputs fieldbus input from the PLC is taken over from
PLC to allow feedback to the PLC program. The status of the probe is represented with 2 bytes.
The safety outputs are represented with 1 or 2 bytes.
Diagnostic elements are in the form of 2 bytes which indicate the number of the I/O with the
problem and the value of the diagnostic element. If there is more than one diagnostic element,
the relative values alternate every 500ms.
Each set of information:
-
input status,
-
input diagnostics,
-
fieldbus input status,
-
probe status,
-
safety output status,
-
safety output diagnostics
can be enabled/disabled in order to control the information and thus the number of bytes
exported to the fieldbus.
The definition of the footprint in the input and output is shown from the point of view of
the Mosaic. (Output PLC).
For the fieldbuses in which the mapping position is mandatory (i.e. PROFIBUS) the input
byte must be mapped before the output bytes.
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