Product Description:

The DEF02.1M universal interface card is produced by Bosch Rexroth Indramat within the VT-UK2 Universal Cards series. Designed for rack mounting in modular motion systems, the card conditions incremental encoder signals and routes them to drive controllers for speed and position loops in automated machinery. By performing onboard interpolation and level shifting, the module relieves higher-level control hardware and maintains precise synchronization between rotating axes. This signal handling supports stable feedback transfer during acceleration, deceleration, and direction changes.

At connector X24, a 15-pin D-subminiature plug secured by screw clamps accepts TTL square-wave tracks from the encoder. The card tolerates input edges up to an edge distance of 250 ns, corresponding to a 1000 kHz maximum input frequency, so 2 µs period signals are processed without loss. Internal logic converts the differential inputs to a regulated 5 V output level and can source up to 250 mA, allowing direct feed to downstream counters. Overall module demand stays below 4.5 W, which reduces heat buildup in densely populated cabinets. A second conditioning stage raises the high-state threshold to 2.5 V, improving noise immunity on long cable runs while preserving clean switching behavior at the input stage.

In operation, the card executes four-fold interpolation, generating intermediate counts to increase positional resolution. Reliable switching to the low state is supported by a threshold of 0.5 V, which sits well below typical line disturbances. Reference mark handling is assisted by a 50 ns reference point delay that aligns the zero pulse with controller timing. For quadrature evaluation, the unit outputs channel Ua1 at 0° el. and Ua2 at 90° el., providing the phase separation required for direction sensing. This phase relationship lets connected controllers determine rotation direction while using the interpolated pulse train for finer speed and position feedback.