PLC是一种可编程控制器，应用的范围是非常广泛的。用户在使用PLC的时候对于PLC的知识都了解多少呢，PLC与继电器相比的优势有哪些大家都知道吗，下面仪器仪表世界网小编就来详细的介绍一下吧。
1、功能强，性能价格比高
一台小型PLC内有成百上千个可供用户使用的编程元件，有很强的功能，可以实现非常复杂的控制功能。与相同功能的继电器相比，具有很高的性能价格比。可篇程序控制器可以通过通信联网，实现分散控制，集中管理。
2、硬件配套齐全，用户使用方便，适应性强
可编程序控制器产品已经标准化，系列化，模块化，配备有品种齐全的各种硬件装置供用户选用。用户能灵活方便的进行系统配置，组成不同的功能、不规模的系统。楞编程序控制器的安装接线也很方便，一般用接线端子连接外部接线。PLC有很强的带负载能力，可以直接驱动一般的电磁阀和交流接触器。
3、可靠性高，抗干扰能力强
传统的继电器控制系统中使用了大量的中间继电器、时间继电器。由于触点接触不良，容易出现故障，PLC用软件代替大量的中间继电器和时间继电器，仅剩下与输入和输出有关的少量硬件，接线可减少互继电器控制系统的1/10--1/100，因触点接触不良造成的故障大为减少。
PLC采取了一系列硬件和软件抗干扰措施，具有很强的抗干扰能力，平均无故障时间达到数万小时以上，可以直接用于有强烈干扰的工业生产现场，PLC已被广大用户公认为最可靠的工业控制设备之一。
4、系统的设计、安装、调试工作量少
PLC用软件功能取代了继电器控制系统中大量的中间继电器、时间继电器、计数器等器件，使控制柜的设计、安装、接线工作量大大减少。
PLC的梯形图程序一般采用顺序控制设计方法。这种编程方法很有规律，很容易掌握。对于复杂的控制系统，梯形图的设计时间比设计继电器系统电路图的时间要少得多。
PLC的用户程序可以在实验室模拟调试，输入信号用小开关来模拟，通过PLC上的发光二极管可观察输出信号的状态。完成了系统的安装和接线后，在现场的统调过程中发现的问题一般通过修改程序就可以解决，系统的调试时间比继电器系统少得多。
5、编程方法简单
梯形图是使用得最多的可编程序控制器的编程语言，其电路符号和表达方式与继电器电路原理图相似，梯形图语言形象直观，易学易懂，熟悉继电器电路图的电气技术人员只要花几天时间就可以熟悉梯形图语言，并用来编制用户程序。
梯形图语言实际上是一种面向用户的一种高级语言，可编程序控制器在执行梯形图的程序时，用解释程序将它“翻译”成汇编语言后再去执行。
6、维修工作量少，维修方便
PLC的故障率很低，且有完善的自诊断和显示功能。PLC或外部的输入装置和执行机构发生故障时，可以根据PLC上的发光二极管或编程器提供的住处迅速的查明故障的原因，用更换模块的方法可以迅速地排除故障。
7、体积小，能耗低
对于复杂的控制系统，使用PLC后，可以减少大量的中间继电器和时间继电器，小型PLC的体积相当于几个继电器大小，因此可将开关柜的体积缩小到原来的确1/2-1/10。
PLC与继电器相比的优势已经介绍完了，PLC的配线比继电器控制系统的配线要少得多，故可以省下大量的配线和附件，减少大量的安装接线工时，可以减少大量费用。
◆ 企业名称：厦门兴润星贸易有限公司
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◆ 主营业务：DCS,PLC
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◆ 联系人:阳先生
◆ 商务电话：0592-6895320
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Reliance 45C340
Reliance 45C344
Reliance 45C37A
Reliance 45C40
Reliance 45C42
Reliance 45C60
Reliance 45C63
Reliance 45C66
Reliance 45C66A
Reliance 45C67
Reliance 45C69
Reliance 45C901
Reliance 45C913
Reliance 45C92
Reliance 45C940
Reliance 45C966
Reliance 54394
Reliance 54394-1
Reliance 57402-C
Reliance 57406
Reliance 57407-4
Reliance 57407-4
Reliance 57491
Reliance 57516
Reliance 57C329
Reliance 57C330
Reliance 57C409
Reliance 57C410A
Reliance 57C411
Reliance 57C416
Reliance 57C421A
Reliance 57C421B
Reliance 57C430
Reliance 57C431
Reliance 57C435
Reliance 57C491
Reliance 57C554
Reliance 601739-Y
Reliance 610273-14s
Reliance 612404-7R
Reliance 612405-9R
Reliance 612405-9R
Reliance 61C22A
Reliance 801443-8ZS
Reliance 803456-21T
Reliance 803456-2R
Reliance 803456-37RC
Reliance 803612-SE
Reliance 805403-2R
Reliance 805405-1R
Reliance 84543-133
Reliance 9VT401-014HTAN
Reliance F-014962
Reliance Motomatic II
Reliance S-6R8512
Reliance SP500
Reliance WU4001179
Remote Display RD-300
Remote Display RD-300
Renishaw a-2037-0010-03
Rice Lake Weighing Systems IO-810-3A
Rosemount 8712ct12m4
Rosemount 8712ct12m4
Saftronics CIMR-G3U21P5
Saftronics CIMR-G3U42P2
Saftronics CIMR-G3U47P5
Saftronics CIMR-G3U47P5
Samsung LT133X2-154
Scharer 16pc8-3
Scharer 19pc10-1
Schleicher UBA 32/2A C 31409245 713 095
Schleicher UBE 32 ID D 31410062 735 035
Schleicher UBT 16 31106777 42 065
Schleicher UCN20 C 31309837 723 075
Schleicher UKE B 31806981 284 085
Schleicher UKK 100
Schleicher UKZ 31806980 285 095
Schleicher UNG24 31208162 268 095
Schleicher USA 8/1 D/2.1 31511134 880 075
Schleicher USA 8/1 D/2.1 31511134 880 075
Schleicher USB 8-1 D/2.1
Schleicher USP 2A U 31507501 622 075
Schleicher USP 2A U 31507501 622 075
Schleicher USP 2A U 31507501 622 114
Schleicher USP 2A U 31507501 622 114
Schrack RU 110 060
Schroff 20800-188
Seco Q7002
Seco Q7002
Seco Q7002
Seco se2125
Seco SE2302
Servo Dynamics Corp SD2-3060-163-1
Shawmut A4BY 1000
Shawmut TRS250R
Shibaura ID-11005-2
Shimaden SR2201-21B
Sick 7023059
Sick WSU26-120
Sick WSU26-120
Siemens
Siemens 305-01AD
Siemens 305-01BJ
Siemens 305-01T
Siemens 305-04B
Siemens 305-20N
Siemens 305-20T
Siemens 305-22P
Siemens 305-25N
