The SNB10D-425/CU2T safety node unit has an interface function to transmit analog input signals and contact signals from the field to the safety control unit via an ESB bus.It also has a function to supply power to I/O modules.The safety node unit is mounted with power supply modules, ESB bus interface modules, optical ESB bus repeater modules, and I/O modules.

The SNB10D-425/CU2T safety node unit is designed for operation with a 220 to 240 V AC power supply, making it suitable for standard industrial electrical infrastructures. This input power range ensures stable system operation and reliable energy distribution to connected I/O modules and communication interfaces within the ESB bus network.The unit is engineered to operate within a temperature range of -20 to 70 °C. 

Application:
Oil and gas: Oil extraction platforms, gas compression stations and central control rooms.
Refining and petrochemicals: Complex plant areas of refineries for inter-device operations (e.g. from the refining area to the ethylene area).
Ultra-large thermal power generation: Mainframe DCS networks and decentralized auxiliary equipment such as desulfurization, denitrification and water treatment.
Steel and metallurgy: Steel plants connecting different equipment such as blast furnaces, coking plants and converters.

Core Functions:
I/O Expansion: Transmits a large number of safety I/O signals back to the main controller via the ESB bus.
SIL3 Safety Rating: Compliant with IEC 61508 SIL3 standard, it is the core hardware for emergency shutdown and fire gas monitoring.
High Availability: The base backplane design is fully redundant, ensuring that the failure of any single component will not cause system malfunction.