German IVO encoder IVO model IVO price

The IVO encoder has many optical channel tracks. Each track is arranged sequentially with 2 line, 4 line, 8 line, and 16 line. In this way, at each position of the encoder, by reading the light and dark states of each track, a unique 2-ary code (Gray code) is obtained, ranging from the zeroth power of 2 to the n-1th power of 2. This is called an n-bit absolute encoder. Such encoders use an optical code disk for memory. The absolute encoder determines the code based on mechanical position; it requires no memory, no reference point search, and no continuous counting. Whenever the position needs to be known, it can be read directly. This greatly improves the encoder's anti-interference characteristics and data reliability. From single-turn absolute encoders to multi-turn absolute encoders: in a single-turn absolute rotary encoder, the tracks on the optical code disk are measured during rotation to obtain a unique code. When rotation exceeds 360 degrees, the code returns to the origin, which violates the principle of uniqueness for absolute encoding. Such encoding can only be used for measurements within a rotation range of 360 degrees and is called a single-turn absolute encoder.

IVO Encoder Classification

According to working principles, encoders can be divided into incremental and absolute types. Incremental encoders convert displacement into periodic electrical signals, which are then converted into counting pulses, using the number of pulses to represent the magnitude of displacement. Each position of an absolute encoder corresponds to a specific digital code; therefore, its indication depends only on the start and end positions of the measurement, not on the intermediate process. Rotary incremental encoders output pulses during rotation, and their position is determined by counting equipment. When the encoder is stationary or power is lost, the position is retained by the internal memory of the counting equipment. Thus, after a power loss, the encoder must not move. During operation after power restoration, pulses must not be lost due to interference; otherwise, the zero point remembered by the counting equipment will shift. The amount of this shift is unknown and can only be detected when erroneous production results occur. The solution is to add a reference point. Each time the encoder passes the reference point, the reference position corrects the memory position of the counting equipment. Before reaching the reference point, position accuracy cannot be guaranteed. Therefore, in industrial control, methods such as finding the reference point before each operation or finding zero at startup are used. For example, the positioning of printers and scanners uses the principle of incremental encoders. Each time they are powered on, we hear a series of clicking sounds as they search for the reference zero point before starting work.

IVO Encoder Working Principle

The optical code disk of the series absolute encoder has many optical channel tracks. Each track is arranged sequentially with 2 line, 4 line, 8 line, and 16 line. At each position of the encoder, by reading the light and dark states of each track, a unique 2-ary code (Gray code) is obtained, ranging from the zeroth power of 2 to the n-1th power of 2. This is called an n-bit absolute encoder. Such encoders are determined by the mechanical position of the optical code disk and are unaffected by power outages or interference. The absolute encoder determines the code based on mechanical position; it requires no memory, no reference point search, and no continuous counting. Whenever the position needs to be known, it can be read directly. This greatly improves the encoder's anti-interference characteristics and data reliability.

IVO Encoder Signal Output

Signal outputs include sine waves (current or voltage), square waves (TTL, HTL), open collector (PNP, NPN), and push-pull types. Among these, TTL is long-line differential drive (symmetric A, A-; B, B-; Z, Z-). HTL is also known as push-pull output. The interface of the signal receiving equipment should match the encoder. Signal connection: The encoder's pulse signal is generally connected to counters, PLC, and computers. Modules connecting PLC and computers are available in low-speed and high-speed versions, with varying switching frequencies. Single-phase connection is used for unidirectional counting and speed measurement. A.B two-phase connection is used for bidirectional counting, direction determination, and speed measurement. Three-phase connection of A, B, and Z is used for position measurement with reference bit correction. Connection of A, A-, B, B-, Z, and Z- involves symmetric negative signals. The electromagnetic field contribution of the current to the cable is 0, resulting in minimal attenuation and optimal anti-interference performance, allowing for longer transmission distances. For encoders with TTL symmetric negative signal output, the signal transmission distance can reach 150 meters. For encoders with HTL symmetric negative signal output, the signal transmission distance can reach 300 meters.

Weidou Intelligent Technology specializes in selling German IVO rotary encoders, IVO incremental encoders, IVO absolute encoders, IVO optical encoders, IVO magnetic encoders, IVO shafted encoders, IVO hollow shaft encoders, IVO contact brush encoders, IVO angle encoders, IVO linear encoders, IVO digital encoders, IVO draw-wire encoders, IVO position encoders, IVO hollow bore encoders, and IVO spindle encoders. IVO products are original imports from Germany. Customers are welcome to inquire and order.