The invention relates to the technical field of industrial
automation control, in particular to a PLC (
programmable logic controller) dual-redundancy power supply module supporting checking of operation
quality information and a control method, comprising a master power supply, a slave power supply and
matched control logic which are redundant to each other; each of the master power supply and the slave power supply comprises an AC input module, a rectification filtering module, a power conversion module, a protection module, an analog quantity acquisition module, an ADC module, an industrial grade MCU module, a nonvolatile storage module, a communication module, a state indication module and an onboard
energy storage unit. The
control logic comprises the steps that the PLC scans the number of modules to determine master and slave identities; the
timer interrupts and triggers the ADC to collect
voltage / current / temperature data, the data are stored in the SRAM after being converted, and abnormal data are stored in the nonvolatile storage unit in a classified mode; the 485 communication module responds to a PLC request to export data; and when the main power supply fails, the slave power supply is automatically switched to the main power supply and outputs 24V. According to the invention, real-time monitoring and accurate fault positioning can be realized, the reliability of the PLC
system is improved, the cost is low, and the method is suitable for industrial
automation scenes.