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WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
7.2 Process Data Architecture
Function Description 71
7.2.1 Basic Setup
After switching on the fieldbus coupler, it identifies all I/O modules of the node that send or expect to receive data (data/bit width > 0). Any number of analog input/output modules and digital input/output modules can be arranged within a node.
Additional Information
For the number of input and output bits or bytes of the individual I/O modules, refer to the corresponding description of the I/O modules.
The coupler creates an internal local process image on the basis of the data width, the type of I/O module and the position of the module in the node. This process image is separated into input and output data range.
The data of the digital input/output modules is bit-oriented, i.e., data is exchanged bit by bit. The analog I/O bus modules represent all byte-oriented bus modules, which send data byte by byte.
This group includes: counter modules, angle and distance measurement modules and communication modules.
For both, the local input and output process image, the I/O module data is stored in the corresponding process image depending on the order in which the modules are connected to the coupler.
Hardware changes can result in changes of the process image!
If the hardware configuration is changed by adding, changing or removing of I/O modules with a data width > 0 bit, this result in a new process image structure.
The process data addresses would then change. If adding modules, the process data of all previous modules has to be taken into account.
A memory range of 256 words (Word 0 ... 255) is initially available in the fieldbus coupler for the process image of the physical input and output data.
Manual
Version 1.0.0
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