Brief Product Description

AI2351 is a SIL3‑certified triple‑modular redundant (TMR) analog input module for TRICONEX Tricon Safety Instrumented System (SIS). Supporting 4‑20mA and voltage‑type field transmitter signals, this rack‑mount module adopts three‑channel independent acquisition and voting logic, ensuring fault‑tolerant signal measurement. It supports hot‑swap replacement and comprehensive channel‑level self‑diagnosis, with high isolation performance against industrial electromagnetic interference. Compliant with IEC 61508 safety standard, it undertakes high‑integrity signal acquisition for ESD, F&G and process interlock systems. As a critical spare component, it is widely used for maintenance and retrofit of legacy Tricon safety control racks.

Core Product Functions

• TMR triple‑modular redundant acquisition and voting for analog process signals to realize single‑point fault tolerance
• Receive 4‑20mA and multiple range voltage signals from pressure, temperature, flow and level transmitters
• High‑precision A/D conversion converts field analog signals into digital data for safety logic processing
• Channel‑to‑channel galvanic isolation suppresses ground loop disturbance and improves anti‑interference capability
• Full‑range self‑diagnosis for open‑circuit, short‑circuit, over‑range and internal hardware faults with real‑time alarm output
• Hot‑swap function allows module replacement without shutting down the whole SIS rack for reduced maintenance downtime
• Front‑panel LED indicators display module operating status and channel fault information for quick on‑site troubleshooting
• High‑speed data interaction with Tricon backplane bus, delivering measured values to safety controller for interlock judgment

• SIL3 safety compliance ensures reliable signal source for emergency shutdown and safety protection logic

Application Scenarios

• TRICONEX Tricon SIS safety instrumented system racks for petrochemical and refining plants
• ESD emergency shutdown system, F&G fire‑gas monitoring system and reactor safety interlock control cabinets
• On‑shore and offshore oil & gas production platform safety protection automation equipment
• Power plant boiler and turbine safety monitoring, burner management system (BMS) signal acquisition units
• LNG and chemical high‑risk process units requiring SIL3‑grade safety measurement

• Spare replacement analog input module for maintenance, expansion and upgrade of existing Tricon installations

FAQ (Frequently Asked Questions)

• Q: System reports channel fault or abnormal analog reading?
  A: Check field transmitter failure, signal cable open‑circuit / short‑circuit, terminal loose contact, base‑plate connection or module hardware degradation.
• Q: Hot‑swap replacement fails and module cannot be recognized by system?
  A: Inspect base‑plate condition, module slot contact, firmware version compatibility and rack back‑plane power supply stability.
• Q: Does AI2351 support hot‑swap under running SIS system?
  A: Yes, it supports hot‑swap, but follow site safety operating procedures; verify module configuration after insertion to avoid safety logic deviation.
• Q: Can AI2351 be used for other brands of SIS or common DCS systems?
  A: It is exclusively designed for TRICONEX Tricon platform; special back‑plane bus and TMR voting mechanism cannot adapt to third‑party systems.
• Q: Is TRICONEX AI2351 available for brand‑new safety‑system projects?
  A: This legacy analog input module has reached end‑of‑life. Only surplus and fully‑tested refurbished units are supplied for existing‑site maintenance work.