Dual-supply input data acquisition terminal

A dual-supply input data acquisition terminal comprises a power supply module, an energy data acquisition terminal, a data acquisition unit and a communication bus unit. The power supply module comprises a switch power supply and a dual-supply switching device. The dual-supply switching device includes a main power supply, a standby power supply and an intermediate relay. The main power supply is divided into two branches, wherein one branch is connected to a wire inlet side terminal of a normally open switch of the intermediate relay, and the other branch is connected to an attraction coil of the intermediate relay. The standby power supply is connected to a wire inlet side terminal of a normally closed switch of the intermediate relay. A wire outlet side terminal of the normally closed switch and a wire outlet side terminal of the normally open switch of the intermediate relay are in in-phase parallel connection and then are connected to the switch power supply. The input of two power supplies is achieved through the dual-supply switching device, and thus one power supply can be automatically switched to the other power supply once the power supply breaks down. Therefore, the running reliability of the data acquisition terminal is improved. Moreover, the dual-supply input data acquisition terminal has the characteristics of low power dissipation and low cost.