(1) Peripheral Communication Interface
PLC with a variety of communication interfaces, PLC can communicate with the programmer, printers, other PLC, computers and other devices to communicate via these interfaces. It can be composed of multi-machine system or even into the network, larger control.
(2) Expansion Interface
For connecting the I / O expansion unit and special function units. By extending the interface can be expanded binary I / O points and adding analog I / 0 terminals can also be connected with intelligent unit performs a specific function, make PLC configuration flexibility to meet the needs of different control systems. I / 0 expansion interface circuit using parallel and serial interface in the form of two circuits.
Industrial control, except that the digital signal to control the outside, sometimes with analog signal control. There are three analog modules: analog input modules, analog output modules, analog input / output modules.
(Ⅰ) Analog Input Module
Analog Input Module, also known as A / D module converts the analog signal to a continuous on-site generated by the sensor into a digital PLC’s CPU can be received, and more generally for 12-bit value, the more digital bits module, the higher the resolution.
(Ⅱ) Analog Output Module
Digital Analog output module, also known as D / A module to the PLC CPU sent to the analog output modules convert analog (voltage or current) external device can receive. The digital signal analog output module receives more generally for 12-bit value, the more digital bits module, the higher the resolution.
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