Model Interpretation

3500/34

3500/34: Base model (4‑channel TMR relay module)

Part Numbers: 125696‑01, 125712‑01 (common variants)

Designation: TMR = Triple Modular Redundancy; each output channel uses 3 internal relays with 2/3 voting.

Technical Parameters

Mechanical

Form Factor: Full‑height, single‑slot

Dimensions (H×W×D): 241 mm × 24.4 mm × 242 mm

Weight: ~0.91 kg

Installation: Full‑height slot in 3500/05 rack (TMR system only)

Relay Channels (4 Channels, TMR)

Output Channels: 4 independent external relay channels

Internal Redundancy: 3 DPDT relays per channel (2/3 voting)

Contact Type: DPDT (configurable as SPST externally)

Contact Rating: 5 A @ 250 VAC / 125 VDC (resistive)

Isolation: 2500 VAC between coil and contacts

Response Time: <25 ms

Logic: AND/OR programmable; maps to any monitor channel’s Alert/Danger

Power & Environmental

Power Consumption: ~9.6 W (from rack backplane, −24 VDC)

Operating Temp: −30°C to +65°C

Storage Temp: −40°C to +85°C

Humidity: 5%–95% RH, non‑condensing

Status LEDs: OK, TX/RX, CH ALARM (per channel)

Core Functions

TMR 2/3 Voting: 3 internal relays per channel; output activates only if ≥2 agree (prevents false trips).

4‑Channel Isolated Outputs: Each channel independent; supports 4 unique alarm/trip zones.

Safety‑Rated Logic: Complies with ISA S84.01; suitable for SIL 2/3 safety systems.

Programmable Alarm Mapping: Link any Alert/Danger from 3500 monitors to any relay channel (AND/OR logic).

Hot‑Swappable: Replace without rack shutdown (redundant power required).

Fault Diagnostics: Detects relay coil/open/short, communication errors, and TMR mismatch.

Applications

Power Generation: Steam/gas turbine ESD, generator protection (SIS‑level trips).

Oil & Gas: Centrifugal compressor shutdown, pipeline pump protection (high‑safety ESD).

Petrochemical/Refining: Critical rotating machinery with SIL 2/3 requirements.

Heavy Industry: Mining/steel mill large motor/turbine safety trips.

Safety Systems: Any application requiring fault‑tolerant relay outputs (no single‑point failure).

Usage & Maintenance

Installation: Insert into full‑height TMR rack slot; wire dry contacts to ESD/DCS terminals.

Configuration: Use 3500 Configuration Software; assign monitor alarms to relay channels, set logic (AND/OR).

Maintenance: Inspect wiring annually; test relay operation every 1–2 years; no internal consumables.

Compatibility: Works only in TMR 3500 racks; pairs with 3500/40M, 3500/42M TMR monitors.