Allen-Bradley 845T-DZ63PEN-5 Optical Rotary Encoder

The Allen-Bradley 845T-DZ63PEN-5, also cataloged as the 845T-DZ63PEN Optical Rotary Encoder, operates as a dedicated hardware component for precise shaft displacement and velocity sensing within motion control systems. The encoder processes physical rotation into dual-channel quadrature plus marker pulse signals using a 3000 PPR optical disk assembly, transmitting 11-24 VDC Differential Line Driver (DLD) outputs across a 5-meter pigtail cable.

Hardware Specifications

EtherNet/IP Deterministic Networks & Motion Execution

Interfacing directly with high-speed counter modules and drive feedback networks, the 845T-DZ63PEN-5 supports EtherNet/IP deterministic networks and I/O density scaling within Logix control architectures. The 11-24 VDC differential line driver configuration provides differential noise immunity across channel A, B, and index Z pulse lines, maintaining high signal integrity over the 5-meter cable run. This enables real-time position verification and high-speed registration indexing without signal degradation or pulse loss.

Frequently Asked Questions

Q: What function does Channel Z serve in the 845T-DZ63PEN-5 pulse sequence?

A: Channel Z acts as an index pulse output that generates one discrete pulse per full 360-degree shaft rotation, providing an absolute homing reference point for position counters.

Q: How does operating voltage selection affect the differential line driver output amplitude?

A: The differential line driver output voltage tracks the applied supply voltage (11-24 VDC), delivering matching high-level signal amplitudes to high-voltage differential input cards.

Field Installation Guidelines

1. Mount the encoder using the square flange mounting face, verifying concentric alignment with the driving shaft to prevent excessive radial force on the internal bearings.
2. Connect the 3/8-inch encoder shaft to the drive mechanism using a flexible shaft coupling to absorb mechanical misalignment and vibration.
3. Route the 5-meter pigtail cable through dedicated low-voltage instrument conduits, separated from high-voltage AC power lines by a minimum distance of 200 mm.
4. Terminate the cable shield at a single earth ground point inside the control cabinet to suppress high-frequency electrical noise and eliminate ground loops.
5. Secure all mounting bolts and verify supply power voltage polarity (11-24 VDC) prior to energizing the encoder circuit.