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6 Memory Register
6.1 Overview of the Memory Register
The storage unit is the central component for all functions of the
COMS-Module. It is subdivided into individual Memory Register with
a width of 16 bits each. In these Memory registers the following
information is stored:
– Input and output data
– Configuration settings
– Module Status
– Error states
The functionality of the addressing was incorporated from Modbus.
The register assignment depends on the application and is not
specified by the Modbus specification. A Memory Register according
to this specification has a register number between 1 (0x0001) and a
maximum of 65536 (0x10000), of which the module only uses a small
part, however.
With 8-bit values, 1 byte remains unused. 32-bit values are stored in
2 registers.
The 16-bit values are stored internally in the memory in Little Endian
order. This must be taken into account when you access data via the
fieldbus interface, SDI or SSC.
NOTICE! In the description of the individual memory registers
and CDI, the memory registers are also referred to as Modbus
registers.
Memory Register
