rotary encoder！

When we use the encoder, we found that the signal output is a very critical part of it? Then the rotary encoder output signal is what kind of process? First of all, we need to understand the basic structure of rotary encoders.

The signal output is sine wave (current or voltage), square wave (TTL, HTL), open collector (PNP, NPN), push and pull a variety of forms, where TTL is long-line differential drive (symmetrical A, A-; B, B -, Z, Z -), HTL also known as push-pull, push-pull output, the encoder signal receiving device interface should correspond to the encoder.

Signal connection - The pulse signal of the encoder is generally connected to the counter, PLC, computer, PLC and computer connected modules are low-speed module and high-speed module, switching frequency is low and high. Such as single-phase connection, for one-way counting, one-way speed.

A.B two-phase connection, for positive and negative counting, to determine the positive and negative direction and speed. A, B, Z three-phase connection for reference position correction with the position measurement.

A, A-, B-, Z-, Z-, Z-connected, due to the connection with a symmetrical negative signal, in the subsequent differential input circuit, common mode noise suppression, only take useful differential mode signal, Interference ability, can transmit the distance.

For the TTL with a symmetrical negative signal output of the encoder, the signal transmission distance of up to 150 meters. Rotary encoders are made of precision devices, so when subjected to a large impact, may damage the internal functions, the use should pay full attention.

Rotary encoder output signal to give you the relevant knowledge to explain these, I hope we can combine the theoretical knowledge and practical understanding of the operation.

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