In the field of industrial control is generally limited to the choice of foreign PLC type, select the Japanese PLC and German PLC to choose two different control interfaces, for these two interfaces, many times we have very vague concept on it, here will Explain the difference between the two.
Japanese PLC's interface is generally NPN type (sink type output), that is, open collector output method, because the Japanese are more cautious, disclaimer to do better, so it generally like to control the ground GND, the power supply is what you gave, burned Things count yours.
German PLC interface is generally PNP type (source output), that is, control Power mode, because Germans prefer to take the initiative in their own hands, I give you Power before you can move, do not give you Power is relatively safe Do you want to burn something without Power?
To better understand some of the expressions, we can use the transistor form to understand more profoundly.
From the above figure, we can see that Siemens has done enough articles on the power supply, so Siemens PLC's internal circuits are relatively more resistant to power supply interference and filtering, and Mitsubishi PLC is due to Power is reserved for customers to provide, this part of the power supply for most customers, will not do the anti-jamming and filtering part of the consideration. I prefer the Siemens series PLC, not because of his stability on the circuit, but also on the software. However, many times we will choose Japanese due to cost pressures. Therefore, there has been a mixed use of the German and Japanese systems. The interface between the two is different. How do we switch between them? Left to PNP and NPN mutual conversion topics.
Industrial control Many times we just want to understand the concept of the interface, and then we can do better control. The depth of understanding of the interface determines the level of control.
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