Description
Allen‑Bradley 1756‑IT16 ControlLogix 16-Channel Non-Isolated Thermocouple / mV Temperature Input Module
Product Description
The 1756‑IT16 is a high-density single-slot temperature analog input module for Rockwell Allen‑Bradley ControlLogix platform. It provides 16 differential non-isolated channels, supporting multiple thermocouple types and ±100mV low millivolt signal acquisition. It adopts 24-bit Sigma-Delta ADC, automatically implements ITS‑90 thermocouple linearization and cold-junction compensation (requires separate 1756-CJC cold junction sensor). It reports open-circuit burnout detection, overvoltage fault and channel status back to the ControlLogix controller. It transmits temperature values in 32-bit floating-point REAL tags via the backplane. This module is widely used for multi-point temperature monitoring in power, petrochemical, heat treatment and pharmaceutical process systems, commonly used spare part for dense temperature measurement.
1756‑IT16
Technical Specifications
- Part Number: 1756‑IT16
- Manufacturer: Rockwell Automation (Allen‑Bradley)
- Series: ControlLogix 1756
- Device Type: 16-CH Thermocouple / mV Temperature Input Module (non-isolated)
- Channels: 16 differential input channels
- Supported TC types: B, C, D, E, J, K, N, R, S, T, TXK/XK(L)
- Millivolt Range: -100 ~ +100 mV
- ADC Resolution: 24-bit Σ-Δ
- Power Draw: 200mA @5.1VDC backplane; 80mA @24VDC external
- Power Dissipation: Max 3W
- Overvoltage Protection: ±30VDC per channel
- CJC: Requires external 1756-CJC cold junction compensation sensor
- Data Format: IEEE 32-bit floating point
- Open Circuit Detection: Burn-out detection, alarm within 2 seconds
- Operating Temperature: 0°C ~ +60°C
- Storage Temperature: -40°C ~ +85°C
- Relative Humidity: 5%~95%, non-condensing
- Mounting: Single slot on ControlLogix chassis
- Weight: Approx. 0.48 kg
- Certifications: CE, UL
Key Features
- 16 high-density differential channels for thermocouple and low mV signal collection
- Built-in ITS‑90 standard linearization for multiple thermocouple types
- 24-bit high precision ADC for accurate temperature measurement
- Channel-level open-circuit burnout detection and fault reporting
- Notch filter configurable to suppress 50/60Hz power frequency interference
- Output temperature value as floating-point tag directly to Logix controller
- Compact single-slot design saves rack space for multi-point temperature monitoring
- Configuration and diagnostics via Studio5000 / RSLogix5000
Application Scenarios
- Thermal power plant boiler, furnace and exhaust gas multi-point temperature monitoring
- Petrochemical reactor, distillation column and heat exchanger temperature measurement
- Heat treatment furnace continuous temperature profile monitoring
- Pharmaceutical sterilization process temperature logging
- Cement kiln and raw material production line thermal monitoring
- Pulp & paper mill digester and dryer temperature control
- Food & beverage batch process temperature acquisition
- Retrofit and spare replacement for ControlLogix multi-point temperature systems
1756‑IT16
Matching / Auxiliary Components
- ControlLogix chassis and 1756 controller (1756-L71 / L72 / L81 etc.)
- 1756-CJC cold junction compensation sensor (mandatory for thermocouple)
- ControlLogix power supply module
- Shielded twisted pair thermocouple compensation cable
- Studio5000 / RSLogix5000 programming software
- 1756-RT removable terminal block
- Surge protection barrier for field thermocouple wiring
- HMI / SCADA for temperature trending and alarm display
Related Rockwell ControlLogix I/O Series Models (9 pcs)
- 1756-IT16 16CH Thermocouple / mV Input Module
- 1756-IR12 12CH RTD temperature input module
- 1756-IRT8I 8CH combined TC & RTD isolated module
- 1756-IF16 16CH general analog input
- 1756-OF8 8CH analog output module
- 1756-IF8I 8CH isolated analog input
- 1756-OF8I 8CH isolated analog output
- 1756-IB16I 16CH isolated digital input
- 1756-OB16E 16CH digital output
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