1. The selection of the power module The selection of the power module is relatively simple, just consider the rated output current of the power supply. The rated current of the power module must be greater than the total current consumption of the CPU module, I/O module, and other modules. The power module selection is only for the plc of the modular structure, there is no choice of power supply for the monolithic PLC.
2. Programmer Selection For small control systems or PLC systems that do not require online programming, a simple, inexpensive programmer is generally used. For complex systems composed of medium and high-end PLCs or PLC systems that require online programming, intelligent programmers with strong functions and convenient programming can be selected, but smart programmers are more expensive. If you have a ready-made personal computer, you can use the PLC programming package to implement the programmer's functions on your personal computer.
3. Selection of Writer In order to prevent users and programs in the RAM from being damaged due to interference caused by voltage changes in the lithium battery, an EPROM writer can be used, by which the user program is cured in the EPROM. Some PLCs or their programmers now have the function of an EPROM writer.
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