AF-501508-0480DCS系统

AF-501508-0480DCS系统
AB，Schneider,Motoman，Triconex，Yaskawa，Foxboro，Fanuc，ABB,GE,Honeywell。Westinghouse,Siemens,Bosch Rexroth,KUKA......等等；所有备品备件均提供一年的质量保证，并且都经过了严格的测试和认证。

   主营产品：PLC模块，DCS备品备件，机器人备件，伺服器，触摸屏，输入输出模块，变频器，电机......

   本公司所经营商品均是原装正品，质量保证，大量现货特价，数字量输入模块，嵌入式模块价钱美丽，具体型号和价钱欢迎咨询！为客户提供性价比优越的产品和方案以及全面的服务，降低客户成本，用心服务，诚信经营！购买请询价，一切产品以询价为主！产品特点：分散式控制系统(DCS)
产品优势：产品的性价比优越的服务方案
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          Schneider（施耐德）140系列等等
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及PLC、DCS、机器人备件、伺服控制器等等进口品牌、停产备品备件
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​PLC系统故障分类和故障诊断
故障的分类
1．外部设备故障
外部设备就是与实际过程直接联系的各种开关、传感器、执行机构、负载等。这部分设备发生故障，直接影响系统的控制功能。
2．系统故障
这是影响系统运行的全局性故障。系统故障可分为固定性故障和偶然性故障。
故障发生后，可重新启动使系统恢复正常，则可认为是偶然性故障。
重新启动不能恢复而需要更换硬件或软件，系统才能恢复正常，则可认为是固定故障。
3．硬件故障
这类故障主要指系统中的模板（特别是I/O模板）损坏而造成的故障。这类故障一般比较明显，影响局部。
4．软件故障
软件本身所包含的错误，主要是软件设计考虑不周，在执行中一旦条件满足就会引发。在实际工程应用中，由于软件工作复杂、工作量大，因此软件错误几乎难以避免。
对于可编程控制器组成的控制系统而言，绝大部分故障属于上述四类故障。根据这一故障分类，可以帮助分析故障发生的部位和产生的原因。
可编程控制器的自诊断测试
可编程序控制器具有较强的自诊断测试功能，在系统发生故障时要充分利用这一功能。在进行自诊断测试时，都要使用诊断调试工具，也就是编程器。
利用系统功能进行诊断测试
利用可编程控制器本身所具有的各种功能，自行编制软件、采取一定措施、结合具体分析确定故障原因。
用户通过程序可以编辑组织块，来告诉CPU当出现故障时应如何处理，
如果相应的故障组织块OB没有编程，当出现该故障时，CPU转到“STOP”状态。
 
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