NEC FC‑9821KE

Technical Specifications: Built‑in Intel 486DX2 66 MHz CPU; 8 KB cache memory; 96 KB ROM; 2 MB RAM; working voltage 24 V DC; operating temperature ‑20 °C ~ +70 °C; dual isolated RS‑485/RS‑422 interfaces, one RS‑232 interface; galvanic isolation 2500 Vrms; DIN‑rail or rack‑mount installation; support Modbus RTU, Profibus‑DP Slave, CANopen protocols.

Functional Features: High‑speed industrial logic operation; multi‑protocol serial communication processing; complete hardware self‑diagnosis function; channel galvanic isolation; support online parameter modification; status LED alarm indication; passive cooling design; compatible with FC‑9800 series I/O modules.

Application Scenarios: Process automation production‑line control, mechanical equipment automatic control, factory building automation system, industrial data acquisition and monitoring, workshop equipment centralized control system.

Performance Parameters: Serial communication baud rate range 300 bps‑115.2 kbps; Profibus‑DP communication rate up to 12 Mbps; MTBF ≥110000 hours; non‑condensing humidity 5%‑95%.

Material Composition: FR‑4 industrial‑grade multilayer PCB; metal alloy front panel and housing; gold‑plated backplane connector; industrial‑grade processor, memory, optocoupler isolation chips; surge‑protection components.

Structural Characteristics: Standard eurocard rack‑mount module structure; front‑panel LED status indicators and communication interface terminals; rear high‑density backplane connector for system bus connection; compact metal housing for electromagnetic shielding.

Working Principle: Controller executes user‑compiled industrial control program stored in internal ROM; reads field‑device signals via backplane bus; completes logic judgment and arithmetic processing; outputs control signals to peripheral modules; realizes data exchange with external equipment through isolated serial communication circuits; internal diagnostic circuit monitors power supply, memory and communication channel status.

Installation Requirements: Install into FC‑9821 series standard rack or DIN‑rail TS‑35 mounting rail; ensure reliable backplane contact; cabinet ventilation temperature within rated range; signal wiring uses shielded cable; protective ground connection is mandatory; separate power‑supply wiring from signal wiring.

Usage Notes: ESD protective measures must be taken during installation and maintenance; cut off power supply before plug‑in and plug‑out; check backup battery status periodically; do not use non‑official firmware; avoid mechanical impact and heavy vibration; prohibit operation beyond rated temperature and humidity range.