IC-Module for EtherNet_IP
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4 Components
4.1 Module Components
The module is divided into independent components to ensure a high
level of flexibility in the application.
The following pages describe the individual components:
4.2 Storage Unit
The storage unit is the central component for all functions of the IC-
Module. It is subdivided into individual Memory registers 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 adopted 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 in
bytes 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. However, this does not mean that they can only be
addressed via the Modbus protocol.
In section "Overview of the Memory Register [
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53]" we have
compiled a detailed overview of registers for you.
Components
