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plc特点和功能
（1）plc的主要特点。plc的特点是：工作可靠、运行速度快、积木式结构、组合灵活、良好的兼容性、程序编制及生成简单、丰富、网络功能强。
（2）plc的主要功能。plc系统能很好的完成工业实时顺序控制、条件控制、记数控制、步进控制等功能；能够完成模/数（a/d）、数/模（d/a）转换、数据处理、通讯联网、实时监控等功能。 多年的实践表明，plc、可靠，是专为工厂设计的，具有根据工作环境要求加固的元件，实时扫描实践及故障诊断功能，故障排除简便，深得用户偏爱。 plc如此可靠的原因是一个可执行继电器逻辑、顺序功能图、功能块、结构文本、命令目录或其组合的实时核心或操作系统。若出现故障，其内置装置能保持机械受损，且能保持有序、有预见的顺序。
2.4 plc的发展趋势：有极快的逻辑运算和的逻辑控制、顺序控制能力，在离散控制中有的可靠性，方便简单易学的编程方法，使其在以离散为主的工业自动化领域中有无可争议的地位。
ABB电源模块的特点及应用

ABB电源模块是采用先进的集成电路技术，将功率器件和逻辑控制电路集成在一个高集成度、全密封的具有电源功能的集成块。电源模块具有使用方便、性能可靠的优点，它代表了电源技术的发展方向。由于开关电源具有工作效率高、体积小的优点，所以适于集成化；而线性稳压电源由于它的效率低，一般在50%左右，所以较难实现大功率（100W以上）集成。吉密科技介绍的电源模块是指开关电源模块，重点是DC/DC变换器。现在的开关电源模块可达几百瓦甚至上千瓦。
电源模块产品主要有DC/DC变换器模块，功率因数校正模块，交流输入模块等，它们的主要特点是：
1.ABB电源模块的工作频率高，一般为300KHz~1MHz.
2.ABB电源模块体积小，超薄型，厚度一般低于20mm，重量轻，一般小于200g.
3.ABB电源模块的功率密度大，一般为5~10W/立方厘米。
4.ABB电源模块使用方便，外接元件少，可并联扩容，也可实现逻辑控制和遥控。
5.ABB电源模块适用电网电压变化范围宽，一般交流电压在150V~280V波动时，输出都有稳压功能。
6.ABB电源模块温度适应范围宽，可从-55摄氏度~ 100摄氏度，一般高温基板温度为 85摄氏度，低温为0度、-20度、-40度、-55度等几个等级。
7.ABB电源模块全密封封装，具有三防功能，防水、防尘、防撞击。
8.ABB电源模块一般采用零电压开关或零电流开关技术，电磁兼容性好。
9.ABB电源模块结构标准化程度高，安装方便。
PLC features and functions
(1) The main characteristics of PLC. PLC is characterized by reliable operation, fast running speed, building block structure, flexible combination, good compatibility, simple and rich programming and generation, and strong network function.
(2) The main functions of PLC. PLC system can well complete industrial real-time sequence control, condition control, counting control, step-by-step control and other functions; It can complete analog / digital (A / D), digital / analog (D / a) conversion, data processing, communication networking, real-time monitoring and other functions. Years of practice has shown that PLC is reliable and reliable. It is specially designed for factories. It has the components reinforced according to the requirements of working environment, real-time scanning practice and fault diagnosis function. It is easy to eliminate faults and is deeply favored by users. The reason why PLC is so reliable is that it is a real-time core or operating system that can execute relay logic, sequence function diagram, function block, structure text, command directory or its combination. In case of failure, the built-in device can keep the mechanical damage and maintain an orderly and predictable sequence.
2.4 development trend of PLC: it has extremely fast logic operation and logic control and sequence control ability. It has reliability in discrete control and convenient and easy to learn programming method, which makes it an indisputable position in the field of industrial automation dominated by discrete.
Characteristics and application of ABB power module
ABB power module adopts advanced integrated circuit technology to integrate power devices and logic control circuits into a highly integrated and fully sealed integrated block with power function. The power module has the advantages of convenient use and reliable performance. It represents the development direction of power technology. Because the switching power supply has the advantages of high efficiency and small volume, it is suitable for integration; The linear regulated power supply is generally about 50% due to its low efficiency, so it is difficult to realize high-power (above 100W) integration. The power module introduced by Jimi technology refers to the switching power module, focusing on the DC / DC converter. The current switching power supply module can reach hundreds of watts or even up to kilowatts.
Power module products mainly include DC / DC converter module, power factor correction module, AC input module, etc. their main features are:
1. The working frequency of ABB power module is high, generally 300kHz ~ 1MHz
2. ABB power module is small, ultra-thin, generally less than 20mm thick and light, generally less than 200g
3. The power density of ABB power module is large, generally 5 ~ 10W / cm3.
4. ABB power module is easy to use with few external components. It can be expanded in parallel, and can also realize logic control and remote control.
5. ABB power supply module is applicable to a wide range of grid voltage variation. Generally, when the AC voltage fluctuates between 150V and 280v, the output has voltage stabilizing function.
6. ABB power module has a wide temperature range, ranging from - 55 ? C to   100 ? C. generally, the temperature of high-temperature substrate is   85 ? C, and the low-temperature is 0 ? C, - 20 ? C, - 40 ? C and - 55 ? C.
7. ABB power module is fully sealed, with three prevention functions, waterproof, dustproof and impact proof.
8. ABB power modules generally adopt zero voltage switching or zero current switching technology, with good electromagnetic compatibility.
9. ABB power module has a high degree of standardization and easy installation.