This paper gives the detail description of the safe system structure and its function in the oil field automation. Also, it gives the basic steps for safety system design by using PLC.
这篇文章对安全保护系统在油田自动化中的作用及组成给予了详细的描述，也给出了用PLC设计安全保护系统的基本步骤。
Conclusion tie is a safe and effective therapeutic modality in treating PLC, and it can improve the cellular immune state of the patients with PLC significantly.
结论免疫栓塞治疗对原发性肝癌是一种安全有效的治疗方法，同时可改善肝癌患者的细胞免疫状态。
Experimental result shows that PLC can meet the test requirements because it is safe, reliable, economical, convenient for operation, easy for maintenance and has a high degree of automation.
实验证明，PLC在真空预冷实验装置中安全可靠、经济实用、操作维护方便、自动化程度高，可满足试验要求。
After PLC control technology is applied, the revering program disturbance protection is realized, enabling electric control system for gas reversing machine more safe and reliable.
应用PLC控制技术后，实现了交换程序紊乱保护，使煤气交换机电控系统更加安全可靠。
The joint of PLC program controlling system is always the weak link of all systems, and focusing on it can guarantee the safe, reliable and normal operation of the equipment.
PLC控制程序系统结合部历来是各系统的薄弱环节，抓好它，有利于保证设备安全、可靠、正常运转。
The PLC system decrease touch and connection, and it's distinct advance SCR system that safe reliability.
PLC减少接点和接线，明显提高了电控系统的安全可靠性；
The electric appliance partially USES the frequency control, the PLC program control, and the revolution is steady, safe and reliable.
电器部分采用变频调速、PLC程序控制，运转平稳，安全可靠。
To achieve the safe and reliable operation of high power supply in HL-2A Tokamak, an logic control and protection system based on Siemens PLC is applied.
给出了大功率电源控制系统的控制要求、功能和工作原理以及系统PLC硬件构成图和软件流程框图，总结了系统研制中一些实际问题的解决办法。
To achieve the safe and reliable operation of high power supply in HL-2A Tokamak, an logic control and protection system based on Siemens PLC is applied.
给出了大功率电源控制系统的控制要求、功能和工作原理以及系统PLC硬件构成图和软件流程框图，总结了系统研制中一些实际问题的解决办法。
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