SPBRC410库存PLC销售卡件模块
¥2800.00
SST-PB3-CLX库存PLC销售卡件模块
¥2800.00
SST-PB3-CLX-RLL库存PLC销售卡件模块
¥2800.00
SW1-31 ECS1737-3库存PLC销售卡件模块
¥2800.00
T35E00VFHF8FH6AM8HP6E库存PLC销售卡件模块
¥2800.00
T8151B库存PLC销售卡件模块
¥2800.00
CP60-CPU CP60 CP40B-CPU CP40B 工控产品 自动化设备
CP60-CPU CP60 CP40B-CPU CP40B 工控产品 自动化设备
产品均非实价，询价请联系商家。
【主营产品】
贝利Bailey。Allen-Bradley。福克斯波罗Foxboro。
DCS PLC 伺服系统 机器人系统 配件。Schneider施耐德。艾默生EMERSON。Woodward伍德沃德。
Westinghouse西屋。WEStation 系统备件。OVATION系统、WDPF系统、WEStation系统备件。
Honeywell霍尼韦尔。Triconex英维思。Motorola摩托罗拉。Rockwell/Reliance罗克韦尔。
ABB。XYCOM。本特利Bently。GE通用电气。Yaskawa安川。Bosch Rexroth博世力士乐。
Yokogawa横河。Siemens(西门子)。Modicon莫迪康。
A small PLC sensitively controls a d***rdered system. What you can see is two rows of input and output relay terminals, corresponding indicator lights and PLC numbers, which are staggering up and down, just like a rare ten foot integrated circuit. If anyone doesn&＃39;t look at the schematic diagram to repair the faulty equipment, he will be at a loss, and the speed of finding the fault will be extremely slow. In view of this situation, we draw a table according to the electrical schematic diagram, paste it on the console or control cabinet of the equipment, mark the number of each PLC input and output terminal, and the corresponding electrical symbol, Chinese name, that is, the function of each pin of similar integrated circuit. With this input and output table, electricians who understand the operation process or the ladder diagram of the equipment can open it for maintenance. But for those electricians who don&＃39;t understand the operation process and can&＃39;t see the ladder diagram, they need to draw another table: PLC input and output logic function table. This table clarifies the logical correspondence between input circuit (trigger element, related element) and output circuit (performing element) in most operation processes. Practice has proved that if you can skillfully use the input-output correspondence table and input-output logic function table, repair electrical problems, without drawings, you can easily.
2. Input circuit maintenance
To judge whether a button, limit, line and other input circuits are good or bad, press the button (or other input contacts) when the PLC is powered on (preferably in non operating condition, in order to prevent m***peration of the equipment). At this time, the corresponding PLC input terminal and common terminal are short circuited, and the corresponding PLC input indicator light of the button is on, which indicates that the button and line are normal. The light doesn&＃39;t work, maybe it is twisted, the line is not touched well, or the line is broken. If further discrimination, if the button is good, then use a lead of the multimeter, one end is connected to the common end of the PLC input terminal, and the other end touches the corresponding PLC input point (the above operation should be careful, never touch the 220 V or 110 V input terminal). At this moment, the indicator light is on, indicating that there is something wrong with the circuit. The indicator light is not on, indicating that the PLC input point is damaged (this condition is rare, usually caused by strong current invasion).
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