OEMAX NX-CPU750B Basic PLC CPU

The OEMAX NX-CPU750B is a cost-effective, basic CPU module for the OEMAX NX Series PLC system. It is designed for small to medium-scale automation applications that require reliable control without the high-end features of the 750C model. The CPU features one Ethernet port for Modbus TCP communication, a built-in RS-485 port for Modbus RTU or serial device connection, and a program capacity of 32K steps. It is ideal for stand-alone machines, conveyor control, and simple process automation.

Compact and Cost-Effective Design

The NX-CPU750B provides the essential features needed for typical machine control applications at a lower cost point than the high-end 750C. The 0.2 µs/step processing speed is sufficient for most small to medium-sized control tasks, such as packaging machines, conveyors, and simple assembly stations. The 32K-step program memory accommodates moderate-size ladder logic programs, while the 32K-word data memory handles process variables and counters.

Communication Capabilities

The single Ethernet port supports Modbus TCP server/client functions, allowing the CPU to communicate with HMIs, SCADA systems, and other Modbus TCP devices. The RS-485 port supports Modbus RTU (master or slave) and can connect to frequency inverters, power meters, temperature controllers, and other serial devices. The built-in I/O (8 inputs, 8 outputs) provides basic local control, reducing the need for additional modules in small applications.

Application Domains

The NX-CPU750B is ideal for small conveyor systems, packaging machines (wrappers, labelers), pump stations, fan control, HVAC units, simple assembly stations, and OEM machinery where cost is a primary consideration. It is also suitable as a replacement for legacy PLCs in machine retrofits.