Introduction to the selection and use of incremental rotary encoder

Should pay attention to the three parameters:

1. Mechanical installation dimensions, including positioning stop, shaft diameter, mounting hole position; cable outlet mode; installation space volume; working environment protection level meets requirements.

2. The resolution, that is, the number of pulses output per revolution of the encoder, meets the design accuracy requirements.

3. Electrical interface, encoder output mode commonly has push-pull output (F-type HTL format), voltage output (E), open collector (C, common C is NPN-type tube output, C2 is PNP-type tube output), long-line driver Output. Its output should match the interface circuit of its control system.

Second, how to use Incremental Encoder?

1, incremental rotary encoder has a difference in resolution, using the number of pulses generated per revolution to measure, the number from 6 to 5400 or higher, the more the number of pulses, the higher the resolution; this is an important basis for selection one.

2, incremental encoder usually has three signal outputs (differential six signals): A, B and Z, generally use TTL level, A pulse is in front, B pulse is in the back, A, B pulse is 90 degrees apart, each The circle emits a Z pulse that can be used as a reference mechanical zero. Generally, A is used to advance B or B to advance A, but the specific situation depends on the product description.

3, use PLC to collect data, you can use high-speed counting module; use industrial computer to collect data, you can use high-speed counting board; use MCU to collect data, it is recommended to use the input port with optocoupler.

4. It is recommended that the B pulse be a forward (forward) pulse, the A pulse be a reverse (backward) pulse, and the Z origin zero pulse.