The Hollysys LK210 series is China's first medium-to-large PLC launched in 2006, featuring single-rack redundancy where two controllers operate in hot backup mode on the same local backplane. Key specifications include a 533 MHz processor with 13 ns bit operation speed, 80 MB integrated storage, 1 MB power-down retention memory, four 10/100M Ethernet ports supporting Modbus TCP, and dual PROFIBUS-DP interfaces.

This PLC is widely used in rail transit, energy, water treatment, semiconductor manufacturing, automotive components, and various industrial automation applications.

This PLC offers comprehensive redundancy including power, CPU, Ethernet, and PROFIBUS-DP bus, along with triple-proof (moisture, salt spray, mold) coating for high reliability. It complies with IEC61131 standards, holds IEC61508 SIL2 functional safety certification, and passes Achilles Level 2 cybersecurity testing.

The system supports extensive I/O expansion up to 15,360 channels, multiple industrial protocols, and features hot-swappable modules with anti-misinsertion design for easy maintenance.