750-138 MODBUS Modular I/O System Manual
The WAGO-I/O SYSTEM comprises of various components which allow the creation of modular and user specific fieldbus nodes for various fieldbusses.
General:
In all cases a fieldbus node comprises of a fieldbus coupler (1) or a programmable fieldbus controller (1) as head station, a number of I/O modules (2) and an end module (3), which forms the end of the system.
In the following description the term Coupler is used for the fieldbus coupler and the term Controller for the programmable fieldbus controller.
1 – Coupler/Controller:
With its I/O functions the coupler/controller forms the logic operation between the fieldbus used and the field area. All control tasks necessary for the perfect operation of the I/O are performed by the coupler/controller. The connection to different fieldbus systems is made using the corresponding coupler/controller e.g. for PROFIBUS, INTERBUS, CAN, MODBUS etc. A retrofitting to a different fieldbus system by changing the coupler is possible.
As opposed to the coupler the controller is fitted with additional PLC functions. This permits signal pre-processing, which can considerably reduce the data quantity in the network. In the case of a fieldbus failure the controller can process the control program independently. Alternatively the controller can guide the node into a defined condition. Plant modules become independent testable units due to the controller. In the delivered condition, in other words without the user program, the controller behaves as a coupler.
The user can program the controller in accordance with international standards for controller programming, IEC 1131-3 or the corresponding European standard EN 61131-3, in all five languages, IL, LD, FBD, ST and SFC.
The WAGO-I/O-PRO^1 programming system is used for the following functions:
• Programmer setting
• Controller setting
• Loading the program in the controller
• Simulation
• Test and start-up
• Visualisation during operation
• Software documentation
The programming system runs on an IBM compatible PC (for the system requirement please refer to the WAGO-I/O-PRO user manual).
2–I/O modules:
The input and output of the process data is made at the I/O modules. I/O modules are available for various tasks in accordance with varying requirements. Available are digital and analog input and output modules, I/O modules for angle and path measurement as well as communication modules.
The individual I/O modules are described in detail in the following registers.
3 - End module:
The node end module is indispensable. It is always fitted as the last module, to guarantee the internal node communication. The end module has no I/O function.
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