Fig. 2-48 is an AC power source monitoring circuit composed of a 74HC123 or the like. When the AC power is suddenly interrupted, such as lightning strikes, important data stored in the microcomputer may disappear.
To this end, a power supply transient detection circuit is added to effectively protect the data in the memory. The voltage of AC22OV is rectified and regulated to obtain +5V output voltage. This voltage is used as the working power of the microcomputer and also the working power of the timer 74HC123. The 13HC of the 74HC123 is connected to the microcomputer. When the AC power supply is normal, the 74HC123 timer is reset, the output is high level, and the microcomputer works normally. When the AC power supply is abnormal, after detecting the AC power supply for a short-circuit of l5ms, the 13-pin output of the 74HC123 changes from high level to low level. The microcomputer performs data saving work.
Absolute rotary Encoder measure actual position by generating unique digital codes or bits (instead of pulses) that represent the encoder`s actual position. Single turn absolute encoders output codes that are repeated every full revolution and do not output data to indicate how many revolutions have been made. Multi-turn absolute encoders output a unique code for each shaft position through every rotation, up to 4096 revolutions. Unlike incremental encoders, absolute encoders will retain correct position even if power fails without homing at startup.
Absolute Encoder,Through Hollow Encoder,Absolute Encoder 13 Bit,14 Bit Optical Rotary Encoder
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