1756-PAR2 is a redundant power unit module produced by Allen Bradley, Rockwell Automation. Its main function is to convert the input AC power into the required DC power supply and provide backup power in case of main power failure to ensure the normal operation of the system.

This module has high reliability and is widely used in various industrial automation systems, such as CNC machinery, metallurgy, oil and gas, petrochemicals, chemical engineering, paper printing, textile printing and dyeing, mechanical manufacturing, electronic manufacturing, automobile manufacturing, tobacco and plastic machinery, and other fields. In addition, it also supports the ControlLogix PLC system, which has integrated motion control, advanced diagnostics, and support for multiple I/O modules, helping companies control their processes more efficiently.

The 1756-PAR2 module is typically used in conjunction with another 1756-PA75R power supply, which is connected through a 1756-CPR2 cable to achieve synchronization and perform internal communication. This design provides fail safe protection, ensuring that the system can continue to operate in any situation.