Product Overview
The Allen-Bradley 1790D-T4T0 is a 4-channel thermocouple base module designed for DeviceNet networks. It belongs to the CompactBlock LDX product line and functions as an I/O module dedicated to temperature measurement. This module collects small millivolt signals from thermocouples, digitizes them, and transmits the data to a central processor via DeviceNet protocol. It supports up to four independent temperature-measuring devices, making it suitable for industrial applications requiring precise temperature monitoring.
Technical Specifications Breakdown
Key parameters for the 1790D-T4T0 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Number of Inputs | 4 channels |
| Input Range | +76.50 mV |
| Supported Sensors | Thermocouples Type B, E, J, K, R, S, T, N, and 10 µV |
| Resolution | 16 bits, 0.1 °C/bit or 0.1 °F/bit (thermocouple sensors) |
| Module Scan Time | 140 ms/channel @ Notch Filter = 60 Hz |
| Overall Accuracy | 0.2% Full scale @ 0…55 °C |
| Supply Power (DeviceNet) | 24 V DC nom, range 11…28.8V DC |
| Power Dissipation (DeviceNet) | 1.2 W max @ 28.8V DC |
| Temperature Range | 0 to 55 degrees Celsius |
| Open Wire Detection | Supported |
Industry Applications
It also suits chemical processing plants requiring accurate readings from Type K or Type J sensors. The DeviceNet integration allows centralized data collection, reducing wiring costs and improving system reliability.
Installation & Setup Guidance
Mount the module securely on a DIN rail within the specified temperature range (0 to 55 °C). Connect DeviceNet power at 24V DC nominal, ensuring voltage stays between 11 and 28.8V DC. Use copper or copper-clad aluminum conductors with M3.0 terminal blocks, tightening screws to 7 lb-in max. Configure the settable notch filter (default 10 Hz) via the network to match your application's noise environment.
Maintenance & Reliability
Periodically inspect the terminal connections for tightness and check for signs of corrosion. Keep the module within its operating temperature range to maintain accuracy. The module supports open wire detection, which alerts the processor with an "out of range" message if a thermocouple fails.
Compatibility & Integration
The 1790D-T4T0 communicates via DeviceNet protocol, integrating with Allen-Bradley controllers and other DeviceNet-compatible devices. It uses a 20-bit Sigma-Delta modulation converter for precise digitization. The module provides 4 red/green I/O status indicators for quick diagnostics.
Selection Guide & Purchasing Advice
When selecting this module, verify that your system uses DeviceNet and requires 4 thermocouple inputs. The 1790D-T4T0 supports multiple thermocouple types, offering flexibility. AutoDCSTech stocks genuine Allen-Bradley parts to ensure reliable operation.
Availability & Condition at AutoDCSTech
| Part Number | 1790D-T4T0 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
