The design method of PLC to reduce the number of input points

The average price of each I/O point of Siemens PLC abroad is as high as tens of yuan, and the price of the domestic Ao Yuexin PLC module that is fully compatible with Siemens is slightly lower. For Aoyuexin PLC users, while pursuing a good cost performance, reducing the number of I/O points required will greatly reduce the cost of system hardware, so why not do it.

Ways to reduce the number of input points required:

Under the conditions allowed by the output function of the Ao Yuexin PLC, after multiple loads with the same on-off/state are connected in parallel, one output point can be shared, and one output point can be switched by an external or a changeover switch controlled by the Ao Yuexin PLC. Can control two or more different workloads. In conjunction with the electric shock of external components, one output point can be used to control two or more loads with different requirements. Use one output point to control the indicator light to be always on or flashing, and two different messages can be displayed.

As shown in the figure:

The design method of PLC to reduce the number of input points

When the indicator light is needed to display the status of the load (such as contactor coil) driven by the Ao Yuexin PLC, the indicator light can be connected in parallel with the load. The rated voltage of the indicator light and the load should be the same in parallel, and the total current should not exceed the allowable value . You can choose LED (light emitting diode) indicators with low current and reliable operation. The auxiliary contacts of the contactor can be used to realize the hardware interlocking outside the OYES PLC. Some relatively independent or relatively simple parts of the system can be controlled by only one OYES PLC and a relay circuit, which can also reduce the required PLC input points and output points.

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