描述
To master the performance of PLC, you must understand its modules, and by understanding the performance of the modules, you can figure out the performance of the PLC.
In addition to modules, PLCs also have external devices.
Although the control of the system can be realized by PLC without external equipment, it is enough to configure the appropriate modules. However, in order to program the PLC, to monitor the working status of the PLC and the system it controls, and to store user programs, print data, etc., it is necessary to use the external equipment of the PLC. Therefore, the performance of a PLC is directly related to whether the external equipment of this PLC is rich or not, and whether the external equipment is easy to use or not.
There are four major categories of PLC external devices:
Programming equipment: simple programming device, many only accept mnemonic programming, individual can also use graphic programming (such as the EX-type programmable controller of Toshiba Corporation of Japan). A bit more complicated is a graphic programmer, which can be programmed in ladder language. Some also have dedicated computers that can be programmed in other high-level languages. In addition to programming, the programmer can also make some settings for the system to determine the PLC control mode or working mode. The programmer can also monitor the working status of the PLC and the system controlled by the PLC, so as to debug the PLC user program.
Monitoring equipment: small ones have data monitors, which can monitor data; large ones may also have graphic monitors, which can monitor data through screens. Except that the user program of the PLC cannot be changed, the programmer can do everything it can do, which is a good interface for using the PLC. PLC with good performance, this kind of external equipment has become more and more abundant.
Storage device: It is used to store user data permanently, so that the user program is not lost. These devices, such as memory cards, storage tapes, floppy disks or read-only memory. In order to realize these storages, there are corresponding memory cards, tape drives, floppy drives or ROM writers, and corresponding interface components. All kinds of PLC generally have supporting facilities in this regard.
Input and output equipment: it is used to receive signals or output signals, which is convenient for man-machine dialogue with PLC. The input has a bar code reader, a potentiometer for inputting analog quantities, etc. The output includes printers, programmers, and monitors. Although they can also input information to the PLC and output information from the PLC, it is more convenient for the input and output devices to realize man-machine dialogue, which can be realized under on-site conditions and is easy to use. As technology advances, such devices will become more abundant.
External equipment has developed into an integral part of the PLC system. Its situation, of course, is an important aspect that must be understood when selecting PLC, so it should also be listed as an important content of PLC performance.
memory capacity
PLC memory has two parts: user and system. User memory is mainly used to store user programs, and some of them are also allocated for system use. System memory is configured with the CPU. The CPU should not only have the ability to access these memories, but also provide the corresponding storage medium.
User memory size is related to the amount of user programs that can be stored. The memory is large and the amount of programs that can be stored is large, and more complex control can be carried out. From the perspective of development trends, the memory capacity is always increasing. The memory capacity of large PLCs can reach dozens of k, or more than one hundred k. For the user, the system memory is mainly reflected in how many internal devices the PLC can provide. Different internal devices occupy different areas of system memory. Physically there are no such devices, just RAM. But when using by running the program, these devices are actually provided to the user.
The more types and quantities of memory devices, the easier it is for the PLC to carry out various logic and analog control. It is also an important indicator representing PLC performance.
ZYGO ZMI-2002
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