| 摘要 |
The invention relates to an analog input module for an automatism equipment, wherein said module includes one or more input channels, each channel including a measure-acquisition electronic circuit, and said acquisition electronic circuit including: at least three resistors (R1, R2, R3, R4, R1', R2', R3') arranged together so as to define two separate voltage-measurement points (P1, P2, P1', P2'), at least one of said three resistors being a measurement resistor, voltage measuring means capable of measuring two voltages at the two voltage-measurement points (P1, P2, P1', P2'), means (ADC1, ADC2) for converting the two measured voltages into two digital signals (S1, S2, S1', S2'), means for monitoring a ratio between the two digital signals (S1, S2, S1', S2') thus obtained in order to monitor the operation of the input channel. |
