MOD13/1X0291-548

PLC的故障类型有哪些？

外部设备故障

外部设备就是与PLC实际过程直接联系的各种开关、传感器、执行机构、负载等。这些设备发生故障，会直接影响PLC系统的控制功能。因此，维修PLC，首先要分清是外部设备故障，还是PLC本身故障。

系统故障

1）系统故障是影响PLC系统运行的全局性故障。

2）PLC系统故障可以分为固定性故障、偶然性故障。

3）故障发生后，可以重新启动使系统恢复正常，则就是偶然性故障。如果重新启动不能恢复，而是需要更换硬件或软件，系统才能够恢复正常，则认为是固定性故障。

硬件故障

PLC硬件故障主要指PLC系统中的模板、电路损坏而造成的故障。

软件故障

PLC软件故障包含软件错误、操作错误等。PLC软件故障一般可以通过PLC本身的自诊断测试功能或者软件来查看、检查。

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Agilent 7673 Autosampler Kit: 18594B Controller 18593B Injector 18596B Tray

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Agilent 8960 Series 10 Wireless Communications Test Set E5515C - Option 003

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Agilent HP 86060C Compact Lightwave Switch - 2X4 - OPT 002, 012, 051, 109, 204

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Agilent HP 8712ES RF Network Analyzer 300 kHz - 1.3Ghz STD

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Agilent Logic Analyzer Board Interconnect Cable 16754-60002

Agilent N2276A 26.5 GHz Dual 1x6 Microwave Multiplexer

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