HIMA F3 DIO 88 01 982200425 德国HIMA可编程控制器

PLC还有I/O扩展箱体，它不含CPU，仅有电源及I/O单元的功能。扩展箱体也依I/O点数的多少划分有不同的规格。

除上述模块，PLC还有特殊的或称智能或称功能模块。如A/D（模入）模块、D/A（模出）模块、高速计数模块、位控模块、温度模块等等。

这些模块有自己的CPU，可对信号作预处理或后处理，以简化PLC的CPU对复杂的程控制量的控制。智能模块的种类、特性也大不相同，性能好的PLC，这些模块种类多，性能也好。

通讯模块，它接人PLC后，可使PLC与计算机，或PLC与PLC进行通讯，有的还可实现与其它控制部件，如变频器、温控器通讯，或组成局部网络。通讯模块代表PLC的组网能力，代表着当今PLC性能的重要方面。

掌握PLC性能，一定要了解它的模块，并通过了解模块的性能，去弄清楚PLC的性能。

HIMA F3 DIO 88 01 982200425 德国HIMA可编程控制器

PLC also has I/O expansion box, it does not contain CPU, only power and I/O unit functions. The expansion box also has different specifications depending on the number of I/O points.

In addition to the above modules, PLC also has special or intelligent or functional modules. Such as A/D (mold in) module, D/A (mold out) module, high-speed counting module, position control module, temperature module and so on.

These modules have their own CPU, which can pre-process or post-process the signal to simplify the PLC's CPU control of the complex process control quantity. The types and characteristics of intelligent modules are also very different, and PLC with good performance has many types of these modules and good performance.

Communication module, it connects to the PLC, can make the PLC and the computer, or PLC and PLC communication, and some can also achieve communication with other control components, such as frequency converter, temperature controller, or form a local network. The communication module represents the networking capability of the PLC and represents an important aspect of today's PLC performance.

To master the performance of PLC, we must understand its module, and by understanding the performance of the module, we can figure out the performance of PLC.