Model Interpretation

3501E: TMR Digital Input Module, 115V AC/DC, SIL3

P/N: 3501E (base)

Compatibility: Tricon v9–v11 chassis (8110/8111/8112/8115); hot‑swappable

Key Feature: 32 isolated non‑commoned points, 115V AC/DC nominal, TMR voting

Technical Parameters

Electrical & Input

Input Type: Dry/wet contact (115V AC/DC nominal)

Voltage Range: 90–155V AC/DC; DC or 47–63Hz AC

Channels: 32 isolated, non‑commoned (opto‑isolated per channel)

Input Current: ~8mA per channel (on‑state)

Backplane Power: 24VDC (20.4–28.8VDC), ~150mA

Isolation: 2500VDC channel‑to‑backplane galvanic isolation

Redundancy & Safety

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

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

Diagnostics: >99.9% fault coverage; SOE (≤40ms resolution)

MTBF: >150,000 hours

Mechanical

Form Factor: 3U, 19” rack, 1 slot

Dimensions (W×H×D): 114 × 30 × 185 mm

Weight: ~1.84 kg (4.06 lbs)

Mounting: Plug‑in backplane, hot‑swappable

Environmental

Operating Temp: −40°C to +70°C

Storage Temp: −40°C to +85°C

Humidity: 5%–95% RH, non‑condensing

Protection: IP65/IP67 (dust/water resistant)

Diagnostics & Indicators

LEDs: PASS, FAULT, ACTIVE, TMR, ALARM

Fault Detection: Open/short circuit, channel mismatch, TMR deviation

Core Functions

High‑Voltage Digital Input for SIS

Accepts 115V AC/DC field signals (ESD pushbuttons, F&G detectors, interlock switches); 32 isolated channels eliminate common‑mode faults。

TMR Fault‑Tolerant Voting

Three independent input circuits per signal; 2oo3 voting ensures no single‑point failure impacts safety loop—critical for SIL3 ESD/F&G。

Hot‑Swap & Online Maintenance

Replace module without system shutdown; supports online diagnostics and SOE logging for compliance。

High‑Noise Immunity

Opto‑isolation + TMR design rejects ground loops and electrical noise—ideal for harsh oil/gas/chemical environments。

Applications

Oil & Gas: Offshore ESD/F&G systems; 115V AC/DC safety switches

Chemical/Refining: Process interlocks; high‑voltage discrete safety signals

Power Generation: Turbine ESD; boiler safety interlocks

SIS Retrofits: Upgrade legacy Tricon v9–v11 systems with SIL3 115V DI