ABB FEN-31 HTL Encoder Interface Card (68978955) | High-Threshold Logic (HTL) incremental encoder input, RS-422 TTL emulation output, 2 digital latch inputs, motor temperature sensor integration, drive-based feedback option (+L502)

Achieve rock-solid speed feedback and precise position tracking with the ABB FEN-31 HTL Encoder Interface Card (68978955). Engineered to slot directly into the control board option lanes of premium ABB ACS880, ACS850, and ACSM1 inverter drives, this versatile card functions as a high-speed master bridge for standard 1224 V High-Threshold Logic (HTL) incremental encoders. Supporting robust input frequencies up to 300 kHz, its heavy-duty filtering circuitry effectively suppresses electrical noise and transients across extended motor cable lengths.

The board features a smart multi-terminal layout: an isolated HTL encoder input channel, an RS-422-standard-compliant TTL encoder emulation output loop for master-slave synchronization, and 2 high-speed digital latch inputs optimized for time-critical positioning and capturing referencing pulses. Additionally, it integrates a specialized thermal connection channel supporting PTC, Pt1000, or KTY temperature sensors, running motor diagnostic data back through the single encoder line to slash copper cabling footprint. Complete with hardware-driven wire break diagnostics, it is the premier engineering option (+L502) to guarantee strict closed-loop precision in demanding vector control configurations.