Chapter three tells the technology and theory which will be used in system design, then introduces Siemens AG. SIMATIC S7-200 PLC and emphasizes on the analysis of reliability in industrial use.
第三章针对西门子s7- 200系列plc，叙述了本课题开发所依据的技术原理和理论依据，并着重针对工业应用中的可靠性与抗干扰问题进行了分析。
Chapter three tells the technology and theory which will be used in system design, then introduces Siemens AG. SIMATIC S7-200 PLC and emphasizes on the analysis of reliability in industrial use.
第三章针对西门子s7- 200系列plc，叙述了本课题开发所依据的技术原理和理论依据，并着重针对工业应用中的可靠性与抗干扰问题进行了分析。
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