NX-CPU750B Replacement Guide for Legacy PLC Systems

The NX-CPU750B is a high-performance Central Processing Unit (CPU) module from the NX700 series Programmable Logic Controller (PLC) family. Originally developed by Samsung Electronics, it was later managed under a joint venture with Rockwell Automation before being spun off to RS Automation, who currently handles the brand and manufacturing. Metmro Rsautomationusa

Product Overview & Specifications

The NX-CPU750B is designed for complex, high-speed industrial automation tasks. Its core technical attributes include:

Processing Power: Extremely fast base instruction execution at 20 nanoseconds (0.02μs). Rsautomationusa
Capacity: Supports up to 128k steps of program memory and can control up to 8,192 I/O points. Rsautomationusa
Connectivity: Features two built-in serial ports (RS-232C and RS-422/485) for HMI and device communication. Rsautomationusa
Market Status: Classified as a legacy or "end-of-life" product, making it highly valuable in the MRO (Maintenance, Repair, and Operations) market for supporting existing factory lines. Metmro Interactanalysis

Market Trends & Insights

The industrial automation market is currently shifting from traditional PLC logic toward integrated motion control and IIoT-enabled systems. Interactanalysis Grandviewresearch

The MRO Opportunity: As many companies still operate legacy systems like the NX700, there is a strong secondary market for high-quality spare parts. Pricing for genuine, "new-in-box" or refurbished NX-CPU750B units typically ranges from $200 to $1,500 depending on condition. Alibaba Ebay
Technological Migration: Current trends show a massive growth in EtherCAT and Motion-based controllers (growing at a CAGR of ~5.9%), which offer better multi-axis synchronization and data visibility than legacy PLCs. Interactanalysis Grandviewresearch
Asia-Pacific Dominance: This region, particularly China, holds over 44% of the motion control market share, driving both the supply of legacy components and the development of next-generation replacements. Interactanalysis Grandviewresearch