| 摘要 |
An analog input circuit of PLC is provided to realize a compact device by preventing the interference between channel terminals through a signal transmitting unit and converting an input signal supplied from a plurality of channel terminals into one signal. A channel terminal part(220) comprises channel terminals(221, 222, 223) for connecting with external devices(201, 202, 203). A signal converting unit(240) amplifies the signal inputted through a channel terminal of a channel terminal, and it converts the amplified signal into a digital and supplies it to a microprocessor(260). A signal transmitting unit insulates the channel terminal and the signal converting unit while being between them.
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