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BENTLY 3500/53-03-00模块卡件

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BENTLY 3500/53-03-00模块卡件

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BENTLY  3500/53-03-00模块卡件 BENTLY  3500/53-03-00模块卡件 BENTLY  3500/53-03-00模块卡件

BENTLY  3500/53-03-00模块卡件 BENTLY  3500/53-03-00模块卡件

BENTLY  3500/53-03-00模块卡件
故障及信息显示功能S7-200PLC内部RS485接口电路图:
  图中R1、R2是阻值为10欧的普通电阻,其作用是防止RS485信号D+和D-短路时产生过电流烧坏芯片,Z1、Z2是钳制电压为6V,大电流为10A的齐纳二极管,24V电源和5V电源共地未经隔离,当D+或D-线上有共模干扰电压灌入时,由桥式整流电路和Z1、Z2可将共模电压钳制在±6.7V,从而保护RS485芯片SN75176(RS485芯片的允许共模输入电压范围为:-7V~+12V)。该保护电路能承受共模干扰电压功率为60W,保护电路和芯片内部没有防静电措施。
二、常发生的故障现象分析:
当PLC的RS485口经非隔离的PC/PPI电缆与电脑连接、PLC与PLC之间连接或PLC与变频器、触摸屏等通信时时有通信口损坏现象发生,较常见的损坏情况如下:
●R1或R2被烧断,Z1、Z1和SN75176完好。这是由于有较大的瞬态干扰电流经R1或R2、桥式整流、Z1或Z1到地,Z1、Z2能承受大10A电流的冲击,而该电流在R1或R2上产生的瞬态功率为:102×10=1000W,当然会将其烧断。
●SN75176损坏,R1、R2和Z1、Z2完好。这主要可能是受到静电冲击或瞬态过电压速度快于Z1、Z2的动作速度造成的,静电无处不在,仅人体模式也会产生±15kV的静电。
●Z1或Z2、SN75176损坏,R1和R2完好。这可能是受到高电压低电流的瞬态干扰电压将Z1或Z2和SN75176击穿,由于电流较小和发生时间较短因而R1、R2不至于发热烧断。
由以上分析得知PLC接口损坏的主要原因是由于瞬态过电压和静电造成,产生瞬态过电压和静电的原因很多也较复杂,如由于PLC内部24V电源和5V电源共地,24V电源的输出端子L+、M为其它设备混合供电可能导致地电位变化,从而造成共模电压超出允许范围。所以EIA-485标准要求将各个RS485接口的信号地用一条低阻值导线连接在一起以保证各节点的地电位相等,消除地线环流!
当带电插拔未隔离的连接电缆时,由于两端电位不相等电路中又存在诸多电感、电容之类的器件,插拔瞬间必然产生瞬态过电压或过电流。and even cause the collapse of the cutter teeth. The film wrapping machine of keshimin company adopts an independent cutter motor shaft. The cutter participating in the synchronization with the film feeding motor can more directly adjust the speed of several synchronization stages during synchronization, ensure the position accuracy of each film cutting, and participate in the color film control at the same time. There is also a very important problem in the feeding and cutting of white film: the control of film length under different wrapping speeds. In order to ensure that the film roller will not continue to leave the film due to inertia after film application, a braking device will be added next to the film roller. Affected by the pulling factor of the braking device and the friction factor of the film roller, the actual film length will change at different wrapping speeds. In other words, if the amount of film on the film motor at one time remains unchanged, the actual film length will be shorter and shorter with the increase