8.A142.68C2.C212 PROFINET Encoder with 100 mm AX Torque Arm

For 8.A142.68C2.C212, EncoderWorks can provide a custom compatible replacement solution for large-shaft PROFINET absolute encoder systems where the key checks are ø20 mm H7 bore fit, encoder-side locking-ring clamping, 100 mm torque-arm preload, GSDML configuration, and three-M12 network wiring. This model should not be handled like a standard 58 mm PROFINET encoder, because the AX hollow-shaft adapter defines the shaft fit, torque-arm load, IP64 installation limit, and temperature-speed operating boundary. Typical production lead time: 15 working days.

This configuration combines a Kübler AX hollow-shaft adapter with a Sendix 5868 absolute multiturn encoder. The AX section provides a ø20 mm hollow-shaft bore, locking ring on the encoder side, and 100 mm torque arm. The encoder body provides PROFINET IO absolute position feedback through three radial M12 connectors using the PROFINET encoder protocol version 4.1. Replacement work should focus on shaft fit, clamp torque, torque-arm alignment, device name, IP address, GSDML file, scaling parameters, preset behavior, diagnostics, and shield grounding.

System Limits

The first system limit is PROFINET commissioning. The controller must preserve the original device name, IP setting, GSDML version, encoder profile behavior, scaling, preset value, counting direction, and diagnostic response. If the encoder appears online but the profile or scaling is different, the PLC may read stable data while the machine position is wrong.

The second limit is AX mechanical installation. The ø20 mm shaft must fit the H7 adapter bore without forcing the clamp, and the locking ring must remain on the encoder side. With a 100 mm torque arm, bracket stiffness and preload must be checked to prevent housing movement, bearing load, or repeatability drift.

The third limit is the AX operating envelope. The adapter is rated IP64, weighs about 3.5 kg, and has temperature-dependent speed limits. High shaft speed, high ambient temperature, or torque-arm preload can become the practical failure boundary before the PROFINET network itself becomes unstable.

Wiring & Installation

Before replacement, record the PROFINET device name, IP address, GSDML file, scaling parameters, preset value, counting direction, alarm settings, and diagnostic behavior from the controller project. Also record the three radial M12 connector assignments for PROFINET ports, supply voltage, ground, and shield connection.

During installation, confirm the ø20 mm H7 shaft fit, keep the locking ring on the encoder side, and align the 100 mm torque arm without preload. Route PROFINET and power cables away from inverter output wiring, maintain shield continuity through the M12 connectors, and avoid ground loops between the encoder housing, machine frame, and cabinet earth. After startup, verify device recognition, actual position value, direction, preset response, diagnostics, torque-arm movement, and repeatability over several machine cycles.

Custom Compatible Solution

EncoderWorks can configure the replacement around the installed shaft and PROFINET control system:

• Match the AX ø20 mm hollow-shaft adapter, encoder-side locking ring, 100 mm torque arm, and mounting envelope
• Preserve Sendix 5868 PROFINET IO protocol behavior, GSDML setup, scaling, preset, direction, and diagnostic response
• Adapt the three radial M12 connector layout, 10–30 VDC supply range, Ethernet wiring, and shield grounding
• Review clamp torque, shaft fit, torque-arm preload, IP64 installation limits, and temperature-speed operating margin

Key Data