What is the purpose of using a safety barrier in the internal settings of a PLC? ?

What is an internal safety barrier in a PLC? ? I really don’t understand this thing

It generally serves for current limiting and isolation

This post was last edited by 1111111 on 2018-4-28 at 13:33. Initially, a was a and b was b; when needed, a+b were used to build the system. In this way, while a and b were in use, if a failed, it could be replaced with another a, and if b failed, it could be replaced with another b – everything remained clean and straightforward. In this world, there’s a certain kind of idiot who is asked to come up with an innovative design, but doesn’t have the skills for it; he simply draws circuits for A and B on one circuit board, and treats building with blocks as some kind of skill. In this operation mode, if there is a failure in either component a or b, the entire system will stop working, and then you will have to buy a new entire unit. . . Do you understand? In this world, when there are crappy product designs, there are always people who eagerly go and buy those crappy products. . . The world is never short of idiots. . . With an underdeveloped IQ, who can stop that? :P

Inside the PLC? I don’t know, Zhanlou study*

The safety barrier inside a PLC is generally used to ensure the safety of the PLC itself; for example, in certain special situations or abnormal conditions, it prevents low-voltage modules from interfering with high-voltage circuits. It is not a safety barrier in the sense of design specifications.