IS200SRTDH2ACB 燃机板卡 GE The functions of PLC are very rich. This is mainly related to its rich instruction system for processing information and internal devices for storing information.
It has dozens or hundreds of instructions, which can handle various logic problems and perform operations on various types of data. Anything a normal computer can do, it can do.
Its internal devices, that is, the data storage area in the memory, are of great variety and large capacity. I/O relays can be used to store incoming and outgoing point information, ranging from tens or hundreds to thousands, tens of thousands, or even tens of thousands. This means that it can carry out the transformation of information in and out of so many I/O points, and carry out such large-scale control.
Its internal relays, which are equivalent to intermediate relays, are more numerous. One bit in memory can be used as an intermediate relay, why not many!
It also has many counters and timers, which are beyond the reach of relay circuits. For small boxes or modules, the internal timers and counters can reach hundreds or thousands. This is also because as long as a word in the memory and some flag bits are used, it can become a timer and a counter, so there are only so many.
Moreover, these internal devices can also be set to be retained when power is lost, or not retained when power is lost, that is, to be cleared after power-on. to meet different usage requirements. These are also difficult for relay devices to do.
Its data storage area can also be used to store a large amount of data, hundreds, thousands, and tens of thousands of words of information can be stored, and it will not be lost after power failure.
PLC also has a wealth of external equipment, which can establish a friendly man-machine interface for information exchange. Program can be input, data can be input, program can be read, data can be read. And reading and writing can be carried out on the screen with pictures and texts. After the data is read, it can be dumped and printed. Data input can be typed, card can be read, and so on.
PLC also has a communication interface, which can be linked or networked with a computer to exchange information with the computer. It can also be networked by itself to form a larger and wider control system that a single machine cannot have.
PLC also has a powerful self-check function, which can perform self-diagnosis. The results are automatically recorded. This adds transparency and convenience to its maintenance.
The rich functions provide the possibility for the wide application of PLC; at the same time, it also creates conditions for the automation, telecontrol and intelligent control of industrial systems.
The integration of rich functions like PLC is not found in other electric controllers; it is also incomparable with traditional relay control circuits.
IS220PDIOH1B
