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By converting shaft rotation into electronic pulses, encoders are used to electronically monitor the position of a rotating shaft. The encoder’s output pulses are counted and evaluated by a control unit to determine machine position and velocity, which provides exceptional accuracy and flexibility when controlling motion. The high mechanical and electronic operating speeds associated with optical encoders increase system speeds and accuracy, decrease cycle times, and boost overall productivity in the manufacturing environment.
Allen-Bradley encoders are a high-quality complement to Rockwell Automation’s PLC-based motion control offering, providing both standard and advanced DeviceNet network-enabled models to fit your architecture of choice. They offer preferred compatibility with other Allen-Bradley servo-positioning controls to deliver a complete application solution.
Featured Products
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Bulletin 845H High-Performance Industrial Incremental Encoder
The 845H provides forty-two code disk resolutions of up to 5,000 pulses per revolution and features state-of-the-art circuitry. The 845H is the industry standard Size 25 incremental encoder. With an electronic frequency response of 210 kHz, the 845H can provide 2,048 pulses per revolution at an operating speed of 6,000 revolutions per minute. Various output signal types are available in order to connect to a wide range of controllers.
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Bulletin 845T Heavy-Duty Incremental Encoder
The Bulletin 845T encoder is a heavy-duty, NEMA Type 4 and IP66-rated incremental shaft encoder that is housed in a compact, two-inch-diameter enclosure. The 845T offers state-of-the-art encoder performance in an extremely robust package, providing code disk resolutions up to 3,000 pulses per revolution and a frequency response of up to 100kHz. Typical applications for the 845T include machine tools, packaging machinery, motion controls and robotics. The heavy-duty bearing assembly, rugged construction and high shaft loading capabilities make the 845T suitable for many of today's harsh industrial environments.
- Industry standard size 20, rugged, die-cast aluminum housing
- NEMA Type 4, & IP66 (IEC529) rated enclosure
- 15,000 RPM maximum slew speed
- Code disk resolution of up to 3,000 pulses per revolution
- Optional gated index
- Overvoltage and short circuit protection
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Bulletin 844D Hollow-Shaft Incremental Encoder
Bulletin 844D blind-shaft and through-shaft incremental encoders mount directly to the monitored shaft via a split collar clamp on the encoder, eliminating the need for mounting plates and flexible couplings. As a result, overall cost and size are reduced considerably. Through-shaft models are installed by inserting the monitored shaft completely through the encoder, while blind-shaft models only require insertion of the end of the shaft. Shaft position is converted to digital pulses in an “A quad B” format.
An important feature of the 844D is high frequency response: 300 kHz for line drivers up to 8,192 PPR and 600 kHz above 8,192 PPR. This allows both high resolution (10,000 and 16,384 PPR) and high shaft speed (over 2,000 RPM at 16,384 PPR). |
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Bulletin 845G Single-Turn Absolute Encoder
The Bulletin 845G is a NEMA Type 4 and 13, single-turn absolute encoder that digitizes shaft position for reliable readouts under a wide range of harsh conditions. This family has been enhanced to include BCD and Natural Binary outputs, push-pull and SSI output configurations and an increased operating temperature of 85°C.
As an added convenience, the 845G incorporates a zero set pin. Most absolute encoders must be de-coupled from the monitored shaft to synchronize the electrical and mechanical zero or home positions. The 845G can be set to zero by connecting DC+ to the zero set pin. |
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Bulletin 842D DeviceNet™ Multi-Turn Absolute Encoder
Bulletin 842D is a 26-bit absolute multi-turn shaft encoder offering direct connection to DeviceNet™ for advanced functionality with reduced wiring cost. This network capability eliminates the need for dedicated input cards and allows connection to the DeviceNet™ trunk line via a low-cost five-pin micro quick disconnect. Up to sixty-three 842D DeviceNet™ encoders can be interfaced to a PLC or other logic system through a single network connection. Providing up to 8,192 counts per revolution (CPR) over a maximum of 8,192 turns, the 842D also incorporates advanced diagnostics and many programmable options.
- Eight programmable cam functions that set a bit when the position is within one of eight value ranges
- Programmable code direction (CW or CCW position increment)
- Offset value enables the user to reset the output in relation to the machine's mechanical position
- Output scaling, which lets you set the optimal counts per revolution for a particular application
- Rugged magnetic technology allows high-shock loading (100 g for 6 ms) and vibration (20 g at 10–2000 Hz)
- High temperature (85°C operating) and high humidity (98%) operation
- Multi-turn counting is accomplished through gearing and magnets
- Absolute position is saved on power failure without any battery back-up
- Change of State (COS) operating mode optimizes network bandwidth
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