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INTERBUS Encoder Interface



The INTERBUS was developed by the company Phoenix Contact. The specification has been popular since 1987 and INTERBUS components are available from over 200 manufacturers. INTERBUS is a fast, universal and open sensor/actuator bus system with one master and several slaves. Data transmission rate and expansion of the bus are independent of one and other. The gross data transmission rate is 500kBit/s, the net data transmission rate is 300kBit/s. For special applications with fiber-optic cable data transmission rates of 2Mbit/s are possible. The number of users is limited to 512.


An INTERBUS system conforms to a ring structure. A compact strand following one direction in the system is used for the bus connection. Beginning at the master (PLC or IPC) the bus system connects the respective control or computer systems to the peripheral input and output modules. The main line of the system is called the remote bus and bridges distances up to 12.8 km between peripheral stations. From the remote bus, branch lines are possible. These branches can be either be an installation remote bus or a local bus. The data transfer is done using the "shift register with sum framework protocol" (in a data cycle all data is shifted through the ring).

POSITAL Encoder with INTERBUS Interface

The absolute rotary encoder is a remote bus user. The individual users are connected by an installation remote bus cable. This cable carries both the bus line coming from the master and the return line. The connection between the rotary encoder and the bus is made by two 9 pin connectors (male and female). An address assignment is not necessary, since the address of the individual users is given by their physical position on the bus. Projecting and parameterization can for example be done with the INTERBUS CMD software or with PC Works.

Encoder Profiles

Three profiles are regulated by the user group ENCOM to ensure smooth data transfer between terminals of different manufacturers: FRABA rotary encoders can be delivered in K1, K2 and K3.