Summary of difficulties and error points in PLC wiring

PLC programming algorithm (1): switch value There are nothing more than three large quantities in PLC: switching quantity, analog quantity, and pulse quantity. Once you understand the relationship between the three, you will be able to master PLC proficiently. 1. Switching quantity is also called logical quantity, which refers to two values, 0 or 1,…

In three minutes, I will help you understand how PLC reads analog quantities.

PLC reading analog signals must have an analog input module, which is often called an AI module. Commonly used analog quantities such as pressure , temperature , humidity, flow , etc. need to be converted into current signals or voltage signals by a transmitter. Current signals are commonly used 4-20mA, or voltage signals 1-5V, and…