#the4thLichuangcompetition#Small PLC output IO port expansion

Small PLC output IO port expansion PLC is a very commonly used industrial control programmable logic controller, but often some projects cannot use multi-output PLC due to project budget and cost control. The following expansion board is developed to solve this problem, which can convert a small number of PLC outputs into multiple output ports. Increase the flexibility of small PLC and reduce engineering costs.

[Please fill in ↓ during the competition stage]   1. PLC is a very commonly used industrial control programmable logic controller, but often some projects cannot use multi-output PLC due to project budget and cost control. The following expansion board is developed to solve this problem, which can convert a small number of PLC outputs into multiple output ports. Increase the flexibility of small PLCs and reduce engineering costs   . 2. General industrial control products are used in harsh working environments with many interfering and uncertain factors, making them more stable. The input adopts optocoupler isolation, which has stronger anti-interference ability;   3. The input voltage is also compatible with 90% PLC power supply 24V on the market. The main core logic uses 74HC154D, which is a 4-16 line priority encoder. In the PLC ladder You can use BCD code instructions in the program, and the 8421 code can decode 16 states. The program is convenient and concise! ,. The peripheral components of this circuit are simple, low-cost, independent 7805 linear regulated power supply, which increases the stability of IC and optocoupler voltage and current, making it more reliable;   4. Please see the BOOM list for the material list; * 5. 6. See the attachment for videos. 7. Above is the truth table of this expansion board. The outputs on the board have corresponding A0, A1... silk screen, which makes it clear at a glance that during the PLC programming process, the BCD command can be used directly to correspond to the output number in decimal. For example: BCD 10 is equivalent to outputting port A10. Finally, thank you Lichuang for providing such a good platform! !