A rapid, transient change in the amplitude of a signal from a baseline value to a higher or
lower value, followed by a rapid return to the baseline value. The pulse input signal has
continuous pulses that are formed by turning voltage (current) ON/OFF for a short time.
Used mostly in sub-detector, to detect speed and position. Its basic principle is, if infrared
rays from LED pass the slit disk and reaches the light-receiving element, analog electric
sign is output, which is converted by voltage comparator to digital sign to be output.
Encoder output is classified into 3 types: A phase, A or B phase and A or B or Z phase.
A phase: Basic output, signal of pulses is output as many as the number of
resolutions for 1 revolution of shaft.
B phase: Signal with a specific phase difference from A phase which can detect
revolution direction of the shaft
Z phase: 1 pulse is output for 1 revolution of shaft. That is, they are used to reset
external counter or to detect the origin position.
2MLF-HO2A, 2MLF-HD2A High Speed Counter Module User's Guide
Figure 146 – Pulse Signal Format
Figure 147 – Encoder