The universal automation kit for building automation

With the Beckhoff Bus Terminal system, all sensors and actuators that are relevant for building automation can be connected directly. The open and flexible I/O system consists of the Bus Coupler with the interface for the bus system and up to 64 electronic terminal blocks. Via the terminal bus extension, expansion up to 255 distributed Bus Terminals is possible. With over 200 different Bus Terminals, Beckhoff offers the right technology for all data points and for all signal types.

The head of an electronic terminal block is the Bus Coupler with the interface to the fieldbus. Bus Couplers are available for all main bus systems. The device used most commonly for building services applications is the Ethernet TCP/IP Bus Coupler. With communication terminals for all building standards, bus functions are available in the form of a standard Bus Terminal. This is particularly advantageous for bus systems that are integrated as subsystems into a higher-level system, like EIB, LON, DALI, MP-Bus or the serial interfaces RS232/RS485.

Sensors and actuators with suitable interfaces can be monitored and controlled via the Bus Terminal system. They can communicate with the higher-level controller via Ethernet.

Free mix of signals
The Beckhoff I/O system is thus probably the most comprehensive system on the market. The components enable users to operate mixed signal configurations without restriction at each station. Suitable Bus Terminals are available for all digital and analog signal types encountered in the world of automation: for current and voltage with standardised signal levels, and also for resistance thermometer (RTD) and thermocouple signals.

The fine granularity of the Bus Terminals enables furthermore bit-precise composition of the required I/O channels. The digital Bus Terminals are available as 2-, 4- or 8-channel terminals. The standard analog signals of ± 10 V, 0 ... 10 V, 0 ... 20 mA and 4 ... 20 mA are all available as 1-, 2-, 4-, and 8-channel variants within a standard housing. In the 8-channel variant, analog input and output signals are arranged in an ultra-compact way within a standard Bus Terminal housing across a width of only 12 mm. The system is therefore highly modular and can be configured exactly and cost-effectively down to a single channel. It enables simple and fast retrofitting of building functionalities.

Flexible connection system
The Bus Terminal system offers different connection options for optimum adaptation to the respective application. The standard KL type Bus Terminals include electronics and connection level in a single housing. In contrast, KS type Bus Terminals are equipped with a pluggable connection level. The KS series Bus Terminals enable the complete wiring to be removed as a plug connector from the top of the housing for servicing.

As an alternative, the KM type terminal modules feature pluggable wiring, combining 16, 32 or 64 digital I/Os in a very small area with high packing density. Further KM modules designed for building services expand the product range: The KM2604 terminal module combines 4 pluggable power relays in one fieldbus module. The high switching capacity of 16 A at 230 V AC enables direct switching of consumers with high current consumption, at a low price per channel.

The sensors for the weather station are also logged directly by the Bus Terminals.		Ethernet – a network for office and building communication		Terminal modules – the logical extension of the Bus Terminal system