Allen-Bradley 845T-HC12PFW-1 Rotary Encoders
The Allen-Bradley 845T-HC12PFW-1, also cataloged as the 845T-HC12PFW-1 Optical Incremental Encoder, operates as a dedicated hardware component for rotary position sensing and velocity feedback within industrial motion control and PLC-based motor platforms. The encoder features a 1/4 inch diameter shaft, a servo face mount with mounting holes, and an integrated 1 m (3.28 ft) pigtail cable. Powered by a 5 VDC supply, it outputs quadrature Channel A and Channel B signals via a 5 VDC Differential Line Driver (DLD) at a resolution of 1024 pulses per revolution (PPR).
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 845T-HC12PFW-1 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 1.36 kg (3.00 lbs) |
| Dimensions | Standard 845T heavy-duty encoder housing (1/4 in shaft) |
| Operating Temp | -20 to 70 deg C |
| Power Consumption | 5 VDC input supply |
| Resolution | 1024 PPR (Pulses Per Revolution) |
| Output Signal | 5 VDC Differential Line Driver (DLD), Channel A and B |
| Mounting Style | Servo mount with face mounting holes |
| Cable Connection | Integrated pigtail cable, 1 m (3.28 ft) length |
Deterministic Network Routing & Drive Feedback Execution
The 845T-HC12PFW-1 delivers high-resolution quadrature feedback across motion control loops and high-speed counter cards. Onboard optoelectronic sensing tracks mechanical shaft rotation, converting optical pulse transitions into 5 VDC Differential Line Driver output signals. Differential RS-422 signal transmission mitigates common-mode electrical noise and signal distortion over industrial field wiring. Channel A and Channel B quadrature phasing permits high-speed direction sensing and precise position tracking, facilitating deterministic motion synchronization and tight motor velocity control across networked Allen-Bradley drive systems.
Frequently Asked Questions
Q: What power input voltage and signal output levels are required for the 845T-HC12PFW-1?
A: The encoder operates on a regulated 5 VDC input power supply and outputs 5 VDC RS-422 compatible Differential Line Driver (DLD) square-wave signals on Channel A and Channel B.
Q: How does the differential line driver (DLD) output protect signal integrity over long cable runs?
A: Differential output driver channels transmit complementary true and inverted signals for each channel, allowing differential receiver inputs on motion modules to cancel out common-mode electromagnetic noise.
Q: What mechanical mounting options and shaft dimensions does this model feature?
A: The unit features a standard heavy-duty enclosure with a 1/4 inch solid shaft and a servo face mount equipped with face mounting holes for direct mechanical coupling.
Field Installation Guidelines
- Align the 1/4 inch encoder shaft with the driven motor or machine shaft, utilizing a flexible coupling to prevent excessive radial and axial shaft loading.
- Fasten the servo face mounting flange onto the mounting plate using appropriate screws inserted through the face mounting holes.
- Wire the 1 m pigtail cable conductors to the motion controller or high-speed counter interface block, ensuring correct polarity for 5 VDC power and differential signal channels.
- Connect the cable shield drain wire to a single technical earth point at the panel terminal block to prevent high-frequency noise from corrupting quadrature signal pulses.
- Apply 5 VDC primary power to the encoder and manually verify pulse counting and direction quadrature phasing on the controller interface software.
Allen-Bradley 845T-HC12PFW-1 Rotary Encoders
Allen-Bradley 845T-HC12PFW-1 Rotary Encoders
The Allen-Bradley 845T-HC12PFW-1, also cataloged as the 845T-HC12PFW-1 Optical Incremental Encoder, operates as a dedicated hardware component for rotary position sensing and velocity feedback within industrial motion control and PLC-based motor platforms. The encoder features a 1/4 inch diameter shaft, a servo face mount with mounting holes, and an integrated 1 m (3.28 ft) pigtail cable. Powered by a 5 VDC supply, it outputs quadrature Channel A and Channel B signals via a 5 VDC Differential Line Driver (DLD) at a resolution of 1024 pulses per revolution (PPR).
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 845T-HC12PFW-1 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 1.36 kg (3.00 lbs) |
| Dimensions | Standard 845T heavy-duty encoder housing (1/4 in shaft) |
| Operating Temp | -20 to 70 deg C |
| Power Consumption | 5 VDC input supply |
| Resolution | 1024 PPR (Pulses Per Revolution) |
| Output Signal | 5 VDC Differential Line Driver (DLD), Channel A and B |
| Mounting Style | Servo mount with face mounting holes |
| Cable Connection | Integrated pigtail cable, 1 m (3.28 ft) length |
Deterministic Network Routing & Drive Feedback Execution
The 845T-HC12PFW-1 delivers high-resolution quadrature feedback across motion control loops and high-speed counter cards. Onboard optoelectronic sensing tracks mechanical shaft rotation, converting optical pulse transitions into 5 VDC Differential Line Driver output signals. Differential RS-422 signal transmission mitigates common-mode electrical noise and signal distortion over industrial field wiring. Channel A and Channel B quadrature phasing permits high-speed direction sensing and precise position tracking, facilitating deterministic motion synchronization and tight motor velocity control across networked Allen-Bradley drive systems.
Frequently Asked Questions
Q: What power input voltage and signal output levels are required for the 845T-HC12PFW-1?
A: The encoder operates on a regulated 5 VDC input power supply and outputs 5 VDC RS-422 compatible Differential Line Driver (DLD) square-wave signals on Channel A and Channel B.
Q: How does the differential line driver (DLD) output protect signal integrity over long cable runs?
A: Differential output driver channels transmit complementary true and inverted signals for each channel, allowing differential receiver inputs on motion modules to cancel out common-mode electromagnetic noise.
Q: What mechanical mounting options and shaft dimensions does this model feature?
A: The unit features a standard heavy-duty enclosure with a 1/4 inch solid shaft and a servo face mount equipped with face mounting holes for direct mechanical coupling.
Field Installation Guidelines
- Align the 1/4 inch encoder shaft with the driven motor or machine shaft, utilizing a flexible coupling to prevent excessive radial and axial shaft loading.
- Fasten the servo face mounting flange onto the mounting plate using appropriate screws inserted through the face mounting holes.
- Wire the 1 m pigtail cable conductors to the motion controller or high-speed counter interface block, ensuring correct polarity for 5 VDC power and differential signal channels.
- Connect the cable shield drain wire to a single technical earth point at the panel terminal block to prevent high-frequency noise from corrupting quadrature signal pulses.
- Apply 5 VDC primary power to the encoder and manually verify pulse counting and direction quadrature phasing on the controller interface software.
