51304754-150
51304754-150
51304754-150
电流控制环的应用始于20世纪早期的电传打字机,早使用的是0–60mA环路,后来改为0–20mA环路,PLC系统率先采用了4–20mA环路。
4–20mA电流环有很多优势。在传统的分立器件设计中需要仔细计算,而且与当前的集成4–20mA IC相比,电路占用很大空间。Maxim推出了几款20mA器件,包括MAX15500和MAX5661,可有效简化4–20mA PLC系统设计。
测量到的任何电流值都代表一定的信息。实际应用中,4–20mA电流环路工作在0mA至24mA电流范围。但0mA至4mA和20mA至24mA电流范围用于诊断和系统校准。由于低于4mA和高于20mA的电流用于诊断,可以认为介于0mA和4mA之间的读数表示系统中传输线断开。
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ELDEC 5180012 TRANSFORMER
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