HCU37003703E sequential action according to logical conditions and control of interlocking protection actions according to logical relationships, and data acquisition of a large number of discrete quantities. Traditionally, these functions are achieved through pneumatic or electrical control systems.HCU37003703E is based on integrated circuits and electronic technology control devices, the first time the use of programmed means applied to electrical control, which is the first generation of programmable controllers, called Programmable Controller (PC).

After the development of personal computers (referred to as PC), for convenience, but also to reflect the functional characteristics of programmable controllers, programmable controllers named Programmable Logic Controller (PLC), and now, PLC is still often referred to as PC. programmable controllers and their related equipment should be easy to form a whole with the industrial control system, easy to expand the principle of functional design. The programmable controller and its related equipment should be designed according to the principle of easy to form a whole with the industrial control system and easy to expand its functions.

The HCU37003703E is an electronic system for digital arithmetic operations, designed for applications in industrial environments. It employs a programmable memory for storing instructions to perform logical operations, sequence control, timing, counting, and arithmetic operations within it, and to control various types of machinery or production processes through digital and analogue inputs and outputs.