| 摘要 |
A voltage/current converting circuit is provided in a stage prior to a communication circuit. An over-current preventing circuit is incorporated into the voltage/current converting circuit The voltage/current converting circuit converts a DC voltage signal into a DC electric current signal, and converts an AC voltage signal into an AC electric current signal. Moreover, the voltage/current converting circuit keeps the excessively large electric current that would flow into the internal circuitry thereof to no more than a predetermined electric current value (for example, no more than 30 mA) when the positioner is connected in error to the voltage source side without a load resistance connected.
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