Experience] What signal output does the absolute value signal encoder have (1, 2)

I have introduced many times before that there are two types of cable displacement sensor output, digital signal output and analog signal output, and digital signal output is also divided into incremental pulse signal output and absolute value signal output. Today, I will introduce the system. Which signals are also divided into absolute value signals.

1. Parallel output:

There are multiple high and low level outputs on the port, with 1 or 0 representing the number. For absolute encoders with low digits, the number is generally output directly in this form, which can directly enter the IO interface of the PLC or the host computer, and the output is instant. Simple connection. However, parallel output has the following problems:

2. All interfaces must be connected well, because if there is a bad connection point, the potential of this point is always 0,

3. The transmission distance can not be far, usually within two meters. For complex environments, isolation is best.

Similarly, for the encoder, there must be many node outputs at the same time, which increases the failure rate of the encoder.

The serial output is through the agreement, there is a sequential data output in time, this kind of agreement is called the communication protocol,

Since the good manufacturers of absolute encoders are all in Germany, most of the serial output is matched with Siemens in Germany, such as SSI synchronous serial output.

The serial output connection line is few, the transmission distance is long, the protection and reliability of the encoder are greatly improved. Generally, high-bit absolute encoders use serial output.