Auxiliary input / output device of Piel City (PLC)

摘要

The present invention relates to an auxiliary input / output device of a PLC, which is connected to a PLC to transmit / receive data, the auxiliary input / output device comprising: And a backup circuit for providing an operating voltage such that the memory continues to operate when the power supply voltage supplied to the memory is equal to or lower than a predetermined reference voltage. Thereby, an auxiliary input / output device of the PLC is provided in which data stored in the memory can be preserved even when the power is turned off.