Process Data Architecture. WAGO Controller Modbus TCP

WAGO I/O System 750

750-890 Controller Modbus TCP; G4; 2ETH; SD

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7.2 Process Data Architecture

Function Description 87

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7.2.1 Basic Structure

After switching on, the controller identifies all I/O modules connected with the node that send or receive data (data width/bit width > 0).

In a node can consist of a mixed arrangement of analog input/analog output modules and digital input/digital output modules and special modules.

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Up to 250 I/O modules can be connected with coupler module and end module.

Using the bus extension coupler module 750-628 and bus extension end module

750-627 for local bus extension it is possible to connect up to 250 I/O modules to the Controller Modbus TCP; G4; 2ETH; SD.

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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.

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The data of the digital I/O modules is bit-oriented; i.e., digital data is sent bit by bit. Analog I/O modules represent the group of byte-oriented modules – data is sent byte by byte.

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Manual

Version 1.2.2

88 Function Description WAGO I/O System 750

750-890 Controller Modbus TCP; G4; 2ETH; SD

Hardware changes can result in changes of the process image!

If the hardware configuration is changed by adding, changing, removing or reparametrisation 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 I/O modules, the process data of all previous I/O modules has to be taken into account.

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For the image of the MODBUS/PFC variables, the memory range of words

256...511 is reserved; meaning the image for the MODBUS/PFC variables is created behind the process image for the I/O module data.

If the quantity of module data is greater than 256 words, all the physical input and output data above this value is added to the end of the current process image in a memory range; i.e., attached behind the MODBUS/PFC variables (word

512…1275).

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How the data is accessed from the fieldbus side depends on the fieldbus however.

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Additional Information:

For a detailed description of these fieldbus-specific data access methods, refer to the section "MODBUS Functions".

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Additional Information:

For the fieldbus-specific process image of any WAGO I/O module, please refer to the section “I/O Modules” > … > “Structure of the process data”.

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Manual

Version 1.2.2