Allen-Bradley U MNL 1771-IJ, IK ENCODER/COUNTER MODULES User Manual

The Allen-Bradley U MNL 1771-IJ, IK ENCODER/COUNTER MODULES are designed for use with any Allen-Bradley processor that uses the 1771 I/O structure. These modules are capable of counting input pulses from various devices, such as quadrature encoders, high-speed optical beam counters, and switches. They can be programmed for single or block transfer of data, BCD or binary data formats, and different count resolutions. The modules also include outputs, status indicators, and inputs for additional functionality like home positioning.

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Allen-Bradley U MNL 1771-IJ, IK ENCODER/COUNTER MODULES Manual | Manualzz

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Key features

  • Pulse counting
  • Quadrature encoder support
  • Single/Block transfer
  • BCD/Binary data
  • Status indicators
  • Outputs
  • Home positioning

Frequently asked questions

The module can be used with quadrature encoders, high-speed optical beam counters, and certain types of switches.

The module determines the direction of the count by comparing the phase relationship between input pulses on Channel A and Channel B in the encoder mode. You can also control the count direction using an external switch wired to Channel B in the counter mode.

You can select Times 1, Times 2, or Times 4 count resolution. Times 1 counts the pulse on its rising edge, Times 2 counts both rising and falling edges of Channel A, and Times 4 counts both edges of both Channel A and Channel B.
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