Model Interpretation

3500/33‑AXX‑BXX

3500/33: Base model (16‑channel relay module)

AXX: Isolation type

01: Non‑isolated

02: Isolated

BXX: Approvals

00: None

01: CSA/NRTL/C

02: ATEX/IECEx/CSA (Zone 2)

Common part numbers: 149986‑01, 162291‑01.

Technical Parameters

Mechanical

Form Factor: Full‑height, single‑slot

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

Weight: ~0.7 kg

Installation: Full‑height slot right of TDI in 3500/05 rack

Relay Outputs (16 channels)

Type: Form‑C (SPDT), epoxy‑sealed, arc suppression (250 Vrms)

Rating: 5A @ 250 VAC / 30 VDC (resistive load)

Contact Life: ≥10,000,000 cycles

Response Time: ≤15 ms

Logic: AND/OR/voting/latch per channel; 100 ms update rate

Power & Environmental

Power Consumption: ~5.8 W (from rack backplane, −24 VDC)

Operating Temp: −30°C to +65°C

Storage Temp: −40°C to +85°C

Humidity: 5%–95% non‑condensing

Vibration/Shock: 3 g (5–100 Hz), 10 g (11 ms)

Status LEDs: OK + 16 channel alarm LEDs (front panel)

Core Functions

Provide 16 independent, software‑configurable relay outputs for alarms, trips, and interlocks.

Support complex voting logic (AND/OR/2‑out‑of‑3) using any rack monitor’s Alert/Danger/OK signals.

Enable high‑density I/O for large systems, reducing rack space vs. multiple 3500/32 modules.

Arc suppression extends contact life and protects circuits.

Hot‑swappable (with redundant rack power) for replacement without shutdown.

Interface with DCS/PLC/ESD via dry contacts for seamless integration.

Applications

Power Generation: Steam/gas turbines, generators (multiple trip/alarm points).

Oil & Gas: Compressors, pumps, blowers (complex interlock & ESD logic).

Petrochemical/Refining: Critical rotating machinery (multi‑channel alarm annunciation).

Heavy Industry: Pulp & paper, mining (large asset protection with many I/O).

Safety Systems: SIS/ESD requiring voting‑based trip logic.

Usage & Maintenance

Installation: Insert into full‑height slot right of TDI; wire rear terminals to field devices.

Configuration: Use 3500 Configuration Software (v3.3+); set logic, sources, and contact state.

Maintenance: Inspect connectors annually; no consumables.

Status: Active; supported by Baker Hughes with full spare parts availability.