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SK 616 001-B

为适应工业环境使用.与一般控制装置相比较.PLC机有以下特点:
1. 可靠性高.抗干扰能力强
   工业生产对控制设备的可靠性要求:
①平均故障间隔时间长
②故障修复时间(平均修复时间)短
任何电子设备产生的故障.通常为两种:
    ①偶发性故障.由于外界恶劣环境如电磁干扰.超高温.超低温.过电压.欠电压.振动等引起的故障.这类故障.只要不引起系统部件的损坏.一旦环境条件恢复正常.系统也随之恢复正常.但对PLC而言.受外界影响后.内部存储的信息可能被破坏.
    ②永久性故障.由于元器件不可恢复的破坏而引起的故障.
如果能限制偶发性故障的发生条件.如果能使PLC在恶劣环境中不受影响或能把影响的后果限制在*小范围.使PLC在恶劣条件消失后自动恢复正常.这样就能提高平均故障间隔时间,如果能在PLC上增加一些诊断措施和适当的保护手段.在永久性故障出现时.能很快查出故障发生点.并将故障限制在局部.就能降低PLC的平均修复时间.为此.各PLC的生产厂商在硬件和软件方面采取了多种措施.使PLC除了本身具有较强的自诊断能力.能及时给出出错信息.停止运行等待修复外.还使PLC具有了很强的抗干扰能力.

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