Description
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最小范围，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
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