Description

Triconex 3805E 8‑Channel TMR Analog Output Module

Technical Specifications

• Product Model: 3805E
• Brand: Triconex (Schneider Electric)
• Warranty: One Year
• Input Voltage: TMR rack backplane power; no external field power input on module
• Operating Temperature: 0 °C to +60 °C
• Storage Temperature: -40 °C to +85 °C
• Response Time: Typical <10 ms output update; TMR voting leg‑switching time <10 ms
• Protection Class: IP00, plug‑in rack‑mount for cabinet‑only installation
• Accuracy Class: ±0.25 % full‑scale 4‑20 mA span; 12‑bit resolution
• Output Frequency: Static analog output; supports 4‑20 mA (+6 % over‑range) current signal
• Rated Current Range: 4‑20 mA per‑channel output; continuous +42.5 VDC over‑voltage channel protection
• Communication Interface: Triconex TMR backplane connector; mates with external termination panel
• Supported Protocols: Triconex proprietary TriBus safety bus; SIL3 TMR voting logic
• Overload Capacity: Per‑channel transient‑voltage suppression; TMR triple‑circuit fault‑voting; fault‑diagnostic reporting; no inter‑channel galvanic isolation
• Dimensions: Standard Triconex main‑rack module footprint; pea‑green front‑panel housing

Product Overview

The 3805E is an 8‑channel triple‑modular‑redundant (TMR) analog output safety module for Triconex Trident / Tricon safety instrumented systems. It receives safety‑voted digital commands from the main processor, converts data to 4‑20 mA analog signals to drive control‑valve positioners, I/P converters and modulating field actuators. Triple independent circuit‑voting eliminates single‑circuit failure impact; comprehensive channel‑level diagnostics detect open‑loop, short‑loop and out‑of‑range output faults and report status to the host safety solver.

This module addresses SIS safety‑system challenges: SIL3‑certified fault‑tolerant analog modulating control, online hot‑swap spare‑part replacement, and drop‑in spare compatibility for legacy Triconex safety racks. TMR voting architecture ensures output integrity even when one internal leg suffers failure. Safety‑instrumented‑system engineers, oil‑gas and petrochemical‑plant technicians and safety‑system retrofit integrators benefit most. It fits standard Triconex main‑rack slots, supports online hot‑swap replacement without safety‑system shutdown, and performs modulating safety‑control functions for ESD, compressor anti‑surge and furnace safety‑loop applications in refineries, natural‑gas facilities and power‑generation plants.

Key Application Notes

• Designed exclusively for Triconex TMR safety racks; cannot operate standalone; requires matched external termination panel for field‑wiring termination
• SIL 3 certified per IEC 61508; triple‑modular‑redundant internal voting architecture
• Output range 4‑20 mA; no channel‑to‑channel galvanic isolation; fault‑limiting protection exists between field‑side and TMR backplane
• Supports hot‑swap module replacement while SIS system remains online
• Channel diagnostics flag open‑circuit, short‑circuit and out‑of‑range output conditions for safety‑workstation alarming
• Configurable fail‑safe output state upon module / backplane fault: upscale, downscale or hold‑last‑value
• Conformal‑coated PCB variant available for cabinets with high‑humidity and airborne‑contaminant exposure
• Pea‑green mechanical housing for visual identification of analog‑output module type