Structural scheme (Beckhoff)

Beckhoff

Block diagram of automation Beckhoff

The distributed-centralized architecture of the administrative building is built on the principle of high network reliability, and also an open protocol based on Ethernet, Modbus TCP. With such a distribution, a compromise is achieved between the reliability of the system components and the volume of functions that are embedded in them.
Integration of all existing systems into one based on the basic Modbus TCP protocol allows displaying the system status indication on the room visualization panels and controlling from anywhere in the building. The building automation system with this architecture is scalable both in signal composition and in the composition of protocols and subsystems. Simplicity in expansion of system by new components is provided.
For the organization of a highly reliable ring network, a network communicator of the firm “Modultech MT-IES-3000” was chosen, which ensures the availability of the ring network topology. The building is expected to use two Ethernet rings to automate and ensure the passage of video streams from IP CCTV cameras. To archive information from video cameras, a video server from Microscope will be used.
The main component of the building system is the “Central PC”. This industrial computer has a preinstalled Windows CE operating system using the RT TWINCAT runtime component and provides synchronization functions between the controllers, provides management connectivity from the Citect SCADA system, and also manages the equipment through the room visualization panels. The main feature of the central controller is the energy saving function of the building as a whole. So, under condition of illumination of halls of a building by the sun, the blinds will be opened automatically. The water supply temperature in the central heat station will be adjusted in accordance with the needs of the ventilation system, the temperature of the radiators – analog regulators. The power consumption will also be optimized by supplying different control signals to the frequency drives of euro motors.
The room visualization panel of the CP29 Beckhoff provides the functions of video surveillance, control of equipment modes, scenarios of lighting in the building, the parameters of room heating. On the computers of the panel, it is planned to install the Iridium platform to provide automation functions.
For the fire alarm, a stand-alone Honeywell station is selected with the possibility of output to the general dispatch system.
The controller of the individual heat point (ITP) and other places, the Beckhoff CX8090 PLC with the K-BUS bus is selected. Controllers of this type will be located on different sections and floors of the building to ensure the collection, management and transmission of information from various automation objects. With the controllers, various lighting scenarios (DALI protocol) will be launched, alarm signals will be collected, three-level radiator valves, blinds will be controlled.
For centralized control and indication, a Citect dispatch computer will be installed. In addition to management functions, Citect will perform functions for collecting archived information, displaying graphs, and transferring management functions via the Internet. On the external devices of the PDA (Ipad, etc. based on Android) will be created an application based on Iridium, giving the ability to manage the building systems via the Internet.
On mobile devices (iPAD or PDA based on Android), an application will be created for remote control to the building systems. The application software is supposed to be done on the basis of the visualization system “Iridium”

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