3500/22M本特利3500/22M3500/22M本特利3500/22M

PLC的程序是直接作用于对象的具体工艺过程，那么对对象具体工艺过程的理解是非常重要的的。我在与用户的交流过程中，会用我所掌握的Unit Operation的知识分析用户的工艺过程，协助用户整理过程控制中的各个逻辑关系，甚至包括各种仪表、硬件的配置。这得益于我原本所学的专业。当然，不能要求所有搞PLC程序的工程师都有我这样的经历。但是有两门知识却是*的：一是过程仪表的硬件知识，包括传感器、变送器（二次仪表）和PLC本身，这是构建控制系统的基础；二是过程控制理论，包括各种控制模型的原理和应用，其中zui重要的是二位调节和PID调节模型。

郑娟萍

厦门仲鑫航自动化设备有限公司  

PID调节是目前用得zui广泛的过程控制手段，且变化多端。学习PID的方法就是读书。几乎所有讲解过程控制的书籍都有关于PID的内容，多读基本相关的书籍对理解PID是很有益处的。我发现不少网友在进入PLC领域时，缺乏这些相关知识。这并不可怕；可怕的是当事者不能静下心来弥补知识的缺陷。我们不要怪罪学校没有教授这些内容，而是要注重自己如何去学习这些知识。工作中遇到的许多问题是学校里没讲过的，这不能成为我们拒绝工作的理由，而应该以积极的态度去应对这些问题。我的体会是，为了解决工作中的问题而学习的知识，比课堂上学的东西更容易记住。

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GE D16 Circuit Breaker 480V 1P

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Siemens LMXD63B500 Sentron Molded Case Circuit Breaker 500 Amps

Siemens RXD63B200 Circuit Breaker 2000 Amps

Siemens CLD63B600 Current Limiting Circuit Breaker 600 Amps

Siemens LMXD63B800 Sentron Circuit Breaker 800 Amps (NIB)

Siemens SHLD69600 Sensitrip III Electronic Circuit Breaker 600 Amps

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Siemens JXD63B300 Sentron Series Circuit Breaker 300A

I-T-E EQ-P Circuit Breaker 20A

GE HACR Circuit Breaker 20A 240VAC 1P

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GE EP101UL Circuit Breaker 277VAC D3A

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Siemens BQD1100 Circuit Breaker 277VAC 100A Used

Cutler-Hammer ED322W Circuit Breaker 240VAC 225A

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Cutler-Hammer ED3225 Circuit Breaker 240VAC 225A

Cutler-Hammer EDH3225 Circuit Breaker 240VAC 225A

GE TQD32225 Circuit Breaker 240V 225A 3P

Siemens BQD1100 Circuit Breaker 277VAC 100A

Siemens BQD3100 Circuit Breaker 480VAC 100A

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Siemens BQD315 Circuit Breaker 480VAC 15A (NNB)

Cutler-Hammer ED3125 Industrial Circuit Breaker 125A

Siemens HFS3S250L Circuit Breaker 600VAC 250A

Murray MD-HTR Circuit Breaker 240VAC 200A 2 Pole

GE D3 V-Line Circuit Breaker 480VAC 3A

GE C1 V-Line Circuit Breaker 250VAC

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Siemens BQD330 Circuit Breaker 480VAC 30 Amps 3 Pole

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GE SEHA36AT0030 Hi-Break Circuit Breaker 20A Plug 3P

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Allen Bradley 1492-CB1G320 Circuit Breaker 32A

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GE TFJ236125 Circuit Breaker 125 Amps 3 Pole 600VAC

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Sursum V-EA51 Circuit Breaker G 15A

Sursum V-EA53 Circuit Breaker G1A

Sursum V-EA53 Circuit Breaker G1A  240/415V

Siemens Q130 Circuit Breaker 30 Amp Single Pole

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GE 225 Mag Circuit Breaker 225 Amps 3 Pole

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