High reliability and strong anti-interference ability-the microcomputer has powerful functions but poor anti-interference ability.Electromagnetic interference in industrial sites,power supply fluctuations,mechanical vibrations,and changes in temperature and humidity may cause general-purpose microcomputers to fail to work normally;traditional relays-The contactor control system has strong anti-interference ability,but due to the existence of a large number of mechanical contacts(easy to wear and ablate),the service life is short and the system reliability is poor.PLC adopts microelectronic technology,a large number of switching actions are completed by non-contact electronic storage devices,and most relays and complicated wiring are replaced by software programs,so the service life is long and the reliability is greatly improved.From the actual use situation,The average time between failures of the PLC control system is generally up to 40,000 to 50,000 hours.PLC has adopted a series of hardware and software anti-interference measures,which can adapt to industrial sites with various strong interference,and has the ability of fault self-diagnosis.Such as general PLC can resist the interference of 1000V,1ms pulse,its working environment temperature is 0~60℃,without forced air cooling.
可靠性高、抗干扰能力强——微机功能强大但抗干扰能力差,工业现场的电磁干扰,电源波动,机械振动,温度和湿度的变化,都可能导致一般通用微机不能正常工作;传统的继电器—接触器控制系统抗干扰能力强,但由于存在大量的机械触点(易磨损、烧蚀)而寿命短,系统可靠性差。PLC采用微电子技术,大量的开关动作由无触点的电子存储器件来完成,大部分继电器和繁杂连线被软件程序所取代,故寿命长,可靠性**提高,从实际使用情况来看,PLC控制系统的平均无故障时间一般可达4~5万小时。PLC采取了一系列硬件和软件抗干扰措施,能适应有各种强烈干扰的工业现场,并具有故障自诊断能力。如一般PLC能抗1000V、1ms脉冲的干扰,其工作环境温度为0~60℃,无需强迫风冷。
Sorensen XG40-21-MGA
Sorensen SRL60-35
Sorensen DCR40-40B 40 Vdc 40Amp 1600 W DC supply 208 Va
Sorensen DLM20-30MPG DLM2030MPG PS 0-20 VDC 0-30A 600W