HEIDENHAIN RON 255 18000 Pulses 02S09-04 Id.Nr. 358697-13

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The RON 255 from HEIDENHAIN is a high-precision incremental rotary encoder designed to provide reliable angular feedback for CNC rotary axes. With a resolution of 18,000 pulses per revolution, it ensures accurate positioning, smooth interpolation, and repeatable axis homing.

This model is commonly installed on rotary tables, 4th- and 5th-axis units, dividing heads, and other angular positioning systems that require precise motion control. Its ±5 arc-second system accuracy contributes to stable servo performance and high machining quality.

The 02S09-04 variant code and 358697-13 identification number uniquely define this version, helping ensure a fully compatible replacement without mechanical or electrical modifications. The encoder operates from a 5 V DC (±5%) power supply and provides an output signal of approximately 11 µApp with a 160 kHz cutoff frequency.

Its robust construction features a rectangular aluminum flange with an 85 mm centering collar and a 20 mm hollow through shaft designed for axial clamping. Manufactured in Germany, it is well suited to demanding industrial environments where reliable position feedback is critical.

The incremental rotary encoder is frequently used as a replacement or retrofit component to restore measurement accuracy following encoder failure, signal loss, or wear. It is also a popular choice for preventive maintenance programs aimed at maximizing CNC machine availability and long-term performance.

Frequently asked questions about HEIDENHAIN RON 255 18000 Pulses 02S09-04:

How do I confirm compatibility with my existing rotary axis?
Match the family RON 255, the 02S09-04 version code and the Id.Nr. 358697-13 with your current encoder label. Also verify the required pulse count of 18,000 and connector style as specified by your drive or CNC.

What is the practical advantage of 18,000 pulses per revolution?
High pulse density supports fine angular resolution which helps the servo hold position smoothly and track contours accurately. This is valuable on rotary tables, 4th-axis positioning and precision indexing where small incremental moves must repeat reliably.

Can this unit replace other RON 255 variants with different codes?
Use the exact variant and Id.Nr. for a true drop-in fit. Different codes may indicate mechanical, electrical or connector differences, so they should not be interchanged without a technical verification.

Do you offer tested or refurbished options for urgent downtime events?
Depending on availability, options can include a tested unit or a refurbished unit as well as exchange service to speed up repair turnaround. Contact us for current sourcing and lead times.