The necessity of the PLC power supply and fuse -

PLC controller power supply not only needs to add fuse, also need to add the isolating switch power supply, dc 24 v, 220 v or need to add the isolating switch power supply, to ensure the circuit fluctuation does not impact on PLC controller.

if it is a dc 24 v, we will use ups power supply, ups due to the internal contain the function of the isolation transformer, we don't need to add another isolating switch, but we must increase in PLC controller front air switch, fuse, or pay attention to add fuse is best fast fuse.

I/o point signal input

don't need to explain the output end, the output end is directly controlled end, affirmation is to add a fuse protection, input is to take into consideration the add, however, if the signal at the input is not long is layout in the electrical cabinet, we can choose not to add.

if the signal at the input is too long, and there are so many ways to signal that it is best to add the fuse, if not add the abnormal cause tripping fuse, it is difficult to determine which segment is a problem, also meet the same situation, used to work in a certain period after the trip, in a larger fuse, and burned the whole controller.

we are looking for a long time to find trip points, if we add every input point this rapid fuse, won't appear this kind of circumstance.

so we must be flexible in the work, the best way is to protect as far as possible protection, it is kill two birds with one stone.

The use of programmable control systems plc manufacturers is a great trend in today's world. What you should know is that it has become a very important part of business today.
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Unlike the plc controller price, the is more flexibly used in accasions where programmable control systems .