Model Definition

51401437-301: Honeywell standard part number

51401437: Series code for dual‑channel safety relay modules

301: Hardware revision 3, standard firmware version 01

Module Type: Dual Channel Safety Relay Module

Applicable System: Honeywell TDC 3000, TPS, Experion PKS

Alias: Safety Logic Module, Dual‑Channel Relay Output Board

Technical Specifications

Power Supply: 24 VDC (±10%), power consumption ≤ 150 mA

Output Channels: 2 independent safety relay channels

Contact Rating: 250 VAC / 3 A, 30 VDC / 5 A (resistive load)

Isolation Voltage: 2500 VAC between channels and between channel and backplane

Operating Temperature: -20°C to +60°C

Storage Temperature: -40°C to +85°C

Humidity: 5%–95% RH (non‑condensing)

Dimension: 19 in × 6 U (standard rack‑mount module)

Weight: Approx. 1.2 kg

Certifications: CE, UL, CSA, RoHS compliant

Interfaces & Configuration

Output Interface: Screw terminals for field device connection (e.g., solenoid valves, contactors)

Backplane Interface: Gold‑finger connector for system power and communication

Configuration: Onboard DIP switches for channel enable, safety mode, and fault response

Redundancy: Supports 1:1 hot standby; dual channels cross‑monitor each other

Diagnostics: Built‑in self‑diagnostics with LED indicators for power, channel status, and faults

Key Functions

Dual‑Channel Safety Logic: Executes safety interlock logic with two independent channels, ensuring consistent output and fault detection.

Reliable Relay Output: Drives field actuators (valves, motors) with high‑isolation relay contacts for safe shutdown or emergency trips.

Cross‑Channel Monitoring: Compares status of both channels in real time; triggers alarm/trip on mismatch.

Self‑Diagnosis & Reporting: Detects open/short circuits, coil faults, and contact welding; reports to DCS via backplane.

Safety Integrity: Designed for SIL 2 / SIL 3 safety loops; complies with IEC 61508.

Application Scenarios

Systems: Honeywell TDC 3000, TPS, Experion PKS

Industries: Petrochemical, oil & gas, power generation, pharmaceutical, pulp & paper

Applications: Emergency shutdown (ESD), burner management, pressure/temperature interlocks, safety valve control

Mounting: Standard 19‑inch control cabinet, compatible with Honeywell I/O racks