TRICONEX 4351B (SIS Safety Instrumented System · Communication / Digital Module) Brand / Series: TRICONEX (Invensys), belonging to the Tricon TMR Safety Control System Model: 4351B Type: Triple Modular Redundant (TMR) communication / digital I/O module, applied to SIS/ESD/BMS safety systems. ## 1. Basic Parameters Power Supply: 24V DC (±10%), redundant power supply, power consumption ≤25W Processor: 32-bit, main frequency 33MHz; 1MB RAM / 4MB Flash Safety Level: SIL 3 (TMR triple modular redundancy, single-point fault will not affect system operation) Operating Temperature: ‑40℃ ~ +70℃; Storage Temperature: ‑50℃ ~ +85℃ Protection / Dimensions / Weight: IP20; approximately 225 × 140 × 70 mm; about 2.0 kg ## 2. Core I/O and Interfaces Digital Input (DI): 16 channels, 24V DC, triple redundant acquisition, optoelectronic isolation Digital Output (DO): 16 channels, 24V DC/1A, redundant drive, short circuit / overload protection Communication Interfaces: - Ethernet: 2×RJ45, 10/100Mbps, supporting Modbus TCP and Tricon proprietary protocols - Serial Port: 4×RS‑232/RS‑485, maximum baud rate 115.2kbps, compatible with Modbus RTU and DNP3 Status Indication: LED indicators for power, operation, fault, communication and channel status ## 3. Main Functions Safety Signal Acquisition: Discrete signals such as emergency stop, safety interlock, valve position and flame detection Safety Control Output: Driving actuators including solenoid valves, relays, alarm lamps and safety gates System Communication: Data interaction with Tricon main controller, DCS, SCADA and third-party equipment Fault Diagnosis: Self-inspection for channel short circuit/open circuit, communication abnormality, power failure and TMR voting anomaly ## 4. Typical Applications - Petrochemical and Natural Gas: ESD Emergency Shutdown System, BMS Burner Management System - Power Industry (Thermal Power / Gas Turbine): Unit safety interlock and boiler protection - Oil & Gas Platforms, LNG and Coal Chemical Industry: Core I/O and communication for Safety Instrumented System (SIS) Alternative Models: 4352B (Analog Module), 3503E (Main Control Module)