Model Interpretation

3506XTMR: 3506X = Supervised DI, 24VDC, 32‑point; TMR = Triple Modular Redundancy

P/N: 3506X (3506XTMR is full designation)

Compatibility: Tricon v9–v12 chassis (8110/8111/8112/8115/8116); hot‑swappable

Key Feature: 32 supervised channels, 24VDC, per‑channel open/short/wire‑break detection, advanced glitch filtering

Technical Parameters

Electrical & Input

Input Type: Dry/wet contact, 24VDC nominal

Voltage Range: 18–32VDC (max 36VDC transient)

Channels: 32, individually supervised (no group isolation)

Input Current: ~5mA (on‑state)

Response Time: <10ms all channels; diagnostic glitch ≤2ms (500µs typical)

Backplane Power: 24VDC, ~180mA

Isolation: 1,500VDC field‑to‑backplane galvanic isolation

Redundancy & Safety

Architecture: Triple Modular Redundancy (TMR), 2oo3 voting

Safety Certification: IEC 61508 SIL3, TÜV, UL, CE, ATEX, FM

Diagnostics: >99.99% fault coverage; per‑channel open/short/wire‑break alarm; SOE ≤40ms

MTBF: >160,000 hours

Mechanical

Form Factor: 3U, 19” rack, 1 slot

Dimensions (W×H×D): 114 × 30 × 185 mm

Weight: ~2.5 kg (5.5 lbs)

Mounting: Plug‑in backplane, hot‑swappable

Color Code: Dark Red

Environmental

Operating Temp: −40°C to +70°C

Storage Temp: −40°C to +85°C

Humidity: 5%–95% RH, non‑condensing

Diagnostics & Indicators

LEDs: PASS, FAULT, ACTIVE, TMR, ALARM, LINE‑FAULT

Fault Detection: Open circuit, short circuit, wire break, TMR deviation, stuck state

Core Functions

32‑Channel Supervised 24VDC Input

Monitors ESD pushbuttons, limit switches, proximity sensors; per‑channel line supervision detects broken wires, loose connections, or short circuits—critical for high‑safety loops where hidden wiring faults risk system failure。

Enhanced TMR Fault Tolerance

Three independent input circuits with 2oo3 voting; higher diagnostic coverage than 3505E reduces spurious trips and improves safety integrity for SIL3 applications。

Advanced Glitch Filtering & Noise Immunity

Filters transient glitches ≤2ms to prevent false alarms; 1,500VDC isolation rejects ground loops and electrical noise—ideal for harsh oil/gas/chemical environments。

Hot‑Swap & Online Maintenance

Replace module without shutdown; real‑time diagnostics and SOE logging support regulatory compliance (IEC 61511)。

Continuous Field Circuit Health Monitoring

Beyond standard open/short detection, per‑channel wire‑break monitoring ensures full visibility of field wiring—eliminating “hidden fault” risks in safety loops。

Applications

Oil & Gas: ESD/F&G systems with critical 24V sensors; offshore platforms requiring 100% wiring supervision

Chemical/Refining: HIPPS loops; process interlocks with high‑integrity discrete signals

Power Generation: Turbine ESD; boiler BMS with safety‑critical 24V devices

SIS Upgrades: Replace 3505E for higher diagnostic coverage; SIL3 systems needing per‑channel wire‑break detection