Connect the micro controller and sensor output simple interface

Connect micro controller and sensor output simple interface Shyam Sunder Tiwari welcome to e hall exhibition hall 3 PLC PLC controller programmable controller, PLC controller programming cable. 。 。 Programmable logic controllers and industrial sensor outputs when connection and MCU is usually not too safe, typically require additional TTL and CMOS circuit signal, which makes the sensor's ease of use is affected. When sensors using NPN output state, and support external pull-up resistor connected to the sensor power supply ( Range of 10 - 30 v, typical values for 24 v) Output, below solution provides a simple interface. The design of the transformed signal output with TTL/CMOS circuit is fully compatible with the input stage, to support the output load current (500 霡 Pull current) And the input load current of 100 ma ( Fill current) 。 NPN pull-up resistors are divided into two parts, the upper ( R1) Is the high power terminal, 1 w, resistance resistance 1 k. The lower part ( R2) Is the low power end, 10 k the resistance, voltage 1/4 w. Circuit and the other two parts, zener diode D1 ( According to the requirement of the logical potential, optional 5. 1 v or 3. 3V) And capacitor C1. Capacitance C2 is alternative, at the time of sensor low frequency signal output, used in high frequency noise suppression. Zener diode to realize two functions in the design. Main function set for the stable and safe voltage, to ensure that the conversion of signal output when the safety of the microcontroller. Another function is provided with C1 variable output, to ensure that the MCU power supply. Circuit current capacity of 7. 5 ma, but to run low power microcontrollers are enough and the requirements of the LCD display. Only need very few components, can provide a secure connection industry and PLD to micro controller switching signal of sensor and the other can provide stabilized voltage supply with 7. The capacity of 5 ma. When used for noise suppression, the value of C2 should meet time-varying R2xC2 match a third sensor or the maximum operating frequency of PLC output. Maximum frequency in more than 10 KHZ sensors do not need to C2, because the cable capacitance can meet the demand of filtering. Good quality of twisted pair or coaxial cable will bring the best results in terms of signal output.
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