Ethernet Ip Protocol; Accessing The Process Image; Example - WAGO -I/O-SYSTEM 750 Series Manual

4.3.2 ETHERNET IP protocol

4.3.2.1

Accessing the process image

The AS-Interface data can be accessed in two ways with the ETHERNET IP
protocol.
With pre-defined instances of the assembly object, digital and analog input
and output data of a node are transferred to or from the master with one
command. The application in the master can then address the data in the
memory. The data are stored in the master in the same way as with mapping in
the coupler / controller. The byte-orientated module data (analog modules and
special modules) and the bit-orientated module data (digital modules) are
stored separately in the memory according to the input and output image. The
memory address can thus be determined from the type and position of the
module.
The data in the AS-Interface master can be directly addressed with the analog
input point object or the analog output point object. The instance number of
the respective object is given by the position of the module in the node.
4.3.2.1.1

Example

Let a node contain the following modules with an input / output process
image:
3 x 750-402
1 x 750-452
1 x 750-655
1 x 750-550
1 x 750-452
1 x 750-550
1 x 750-452
1 x 750-504
WAGO-I/O-SYSTEM 750
I/O Modules
each with 4 bits of input data,
4 bytes of input data,
12 bytes of input data and 12 bytes of output data,
4 bytes of output data,
4 bytes of input data,
4 bytes of output data,
4 bytes of input data,
4 bits of output data.
Fieldbus-specific behavior
ETHERNET
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