Toshiba USIO21 CIEMAC nV Series Unified I/O Controller

USIO21 is an integrated unified I/O controller of Toshiba CIEMAC nV distributed control system, manufactured in Japan. It integrates power supply, local I/O acquisition, bus communication and logic processing in one rack-mounted unit, acting as field remote data acquisition station to cooperate with HFAS11S main CPU via 100Mbps TC-net fiber ring bus. It collects on-site analog/digital signals and transmits processed data to the central main control rack.

The device supports redundant eNet industrial Ethernet dual network architecture and multi-branch isolated eBus I/O bus to avoid single-point fault spread. Equipped with RS232, RS485 and fiber optical ports, it can connect third-party analyzers and inverters. It is widely used as spare remote I/O station hardware for overhaul and expansion of thermal power and petrochemical Toshiba DCS systems.

Main Specifications

• Brand: Toshiba; Model: USIO21; Series: CIEMAC nV DCS Remote I/O Station, Made in Japan
• Power Input: AC 100~240V wide-range alternating current built-in power module
• Main Bus Interface: Dual redundant TC-net 100Mbps fiber ring communication bus
• Local Expansion Bus: eBus field I/O bus, 12 physically isolated independent branches
• External Communication: RS232 programming port, RS485 Modbus port, dual fiber Ethernet eNet redundant network
• Signal Compatibility: Match all nV series AI/AO/DI/DO analog & digital I/O modules
• Environment Index: Operating temperature -20℃ ~ +60℃, humidity 5%~95% non-condensing, CE industrial certification
• Diagnosis Indicator: Front panel PWR/RUN/ERR multi-color LED for power, running status and fault alarm
• Core Reliability: Branch electrical isolation, dual network hot backup, hardware self-test protection
• Application: Spare remote unified I/O controller for Toshiba CIEMAC nV DCS system

Core Functions

• Real-time collect analog 4-20mA, switch digital signals from field I/O modules through isolated eBus bus
• Transmit filtered process data to HFAS11S main CPU via TC-net fiber ring for central closed-loop control calculation
• Dual redundant eNet Ethernet network ensures uninterrupted data transmission to operator monitoring stations
• RS485 Modbus channel access third-party gas analyzers, frequency converters and local PLC equipment
• 12 isolated bus branches restrict fault range; short-circuit or overcurrent of one branch will not affect other signal loops
• Built-in signal filtering and anti-interference circuit adapts harsh industrial environments with large motors and high-frequency noise
• Support online firmware download and remote fault diagnosis through engineering software, convenient for field maintenance

Application Scenarios

• Thermal power plant boiler auxiliary room, turbine local equipment CIEMAC nV DCS remote signal collection cabinet layout
• Petrochemical refining workshop reactor, pipeline distributed field I/O station data acquisition construction
• Municipal large-scale sewage treatment plant multi-point liquid level, flow decentralized monitoring supporting projects
• On-site faulty remote I/O station replacement and regular overhaul maintenance of Toshiba nV series DCS racks
• Old factory automation renovation to expand distributed field signal collection capacity of Toshiba DCS systems
• Toshiba CIEMAC nV series remote I/O controller spare parts inventory backup for energy and chemical enterprises
• Metallurgical heating furnace, chemical raw material processing plant decentralized control redundant network transformation projects