Model Definition

51401491-100: Honeywell standard part number

51401491: Series code for low‑level analog multiplexer modules

100: Standard version, hardware revision C/E, firmware revision E

Module Type: Low‑Level Analog Input Multiplexer (LLMux)

Applicable System: Honeywell TDC 3000, TPS (LCN & UCN nodes)

Alias: Thermocouple Mux Filter, MU‑TAMT02, Low‑Level Analog Mux FTA

Technical Specifications

Input Channels: 16 differential low‑level analog inputs (thermocouple, mV)

Signal Type: Thermocouple (J, K, T, E, R, S, B), millivolt (±100 mV)

Resolution: 16‑bit ADC, accuracy ±0.02% of full scale

Filtering: Built‑in low‑pass filter (2 Hz programmable) for noise rejection

Isolation: 2500 VAC channel‑to‑backplane galvanic isolation

Power Supply: 24 VDC (±10%), power consumption ≤ 200 mA

Operating Temperature: 0°C to +60°C

Storage Temperature: -40°C to +85°C

Humidity: 5%–95% RH (non‑condensing)

Dimension: 120 mm × 60 mm × 45 mm

Weight: Approx. 1.14 kg

Certifications: CE, UL, CSA, FM, RoHS compliant

Interfaces & Configuration

Field Interface: Screw terminals for thermocouple/mV signal connection

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

Configuration: Onboard DIP switches for channel enable, filter frequency, thermocouple type

Redundancy: Supports 1:1 hot standby with automatic failover

Diagnostics: LED indicators for power, channel status, fault, and communication

Key Functions

Low‑Level Signal Multiplexing: Gathers 16 channels of weak analog signals (thermocouple/mV) and routes them to the controller.

Precision Signal Conditioning: Amplifies, filters, and isolates low‑level signals to improve accuracy and noise immunity.

Thermocouple Input Handling: Supports multiple thermocouple types with cold‑junction compensation (CJC).

High‑Speed Data Conversion: Converts analog signals to 16‑bit digital data for reliable transmission over the backplane.

Fault Detection & Reporting: Monitors for open circuits, short circuits, and out‑of‑range signals; reports to DCS.

Application Scenarios

Systems: Honeywell TDC 3000, TPS, Experion PKS

Industries: Petrochemical, power generation, metallurgy, pharmaceutical, pulp & paper

Applications: Temperature monitoring, thermocouple data acquisition, low‑level mV signal logging, process loop control

Mounting: Standard 19‑inch I/O cabinet, compatible with Honeywell TDC 3000 I/O racks