28.10.2026
Selecting the correct rotary encoder resolution is a crucial step in the design of motion control, automation, and electric drive systems. Encoder resolution essentially determines the minimum increment of angular or linear movement that a feedback sensor can detect and transmit to the controller. A common engineering mistake is the misconception that installing a high-resolution encoder automatically guarantees superior positioning accuracy, smooth operation, and perfect equipment operation.
Selecting the appropriate encoder PPR value requires a comprehensive consideration of the kinematic diagram, shaft speed, PLC input bandwidth, and machine process requirements.
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Encoder resolution describes how finely an encoder can divide one revolution into measurable positions. Incremental encoder resolution is commonly expressed in pulses per revolution (PPR), while absolute encoder resolution is often specified in bits or positions per revolution.
When analyzing a parameter such as rotary encoder resolution, a 360-degree circle is divided into a specific number of measurement segments. In incremental systems, incremental encoder resolution is typically specified in PPR, which denotes the number of rectangular pulse periods per shaft revolution. In absolute encoders, resolution is expressed in bits, or the number of unique code positions per revolution.