Allen-Bradley 1790D-TN4C0 CompactBlock LDX Analog Input Module

Product Overview

The Allen-Bradley 1790D-TN4C0 is a 4-channel analog current input module from the CompactBlock LDX I/O family. Designed for DeviceNet networks, this module handles current signals from field devices such as pressure transmitters and flow meters. Its compact form factor and reliable performance make it a practical choice for maintenance engineers seeking straightforward signal acquisition without complex calibration.

Technical Specifications Breakdown

Key parameters for the 1790D-TN4C0 are listed below for quick reference:

Industry Applications

For example, it can read 4-20 mA outputs from temperature transmitters in a chemical processing plant, providing accurate data for process control. In water treatment facilities, the 0-20 mA range allows direct connection to flow meters, simplifying integration. The 12-bit resolution ensures reliable signal digitization for most industrial applications, reducing the need for additional signal conditioning.

Installation & Setup Guidance

Mount the 1790D-TN4C0 on a DIN rail within the CompactBlock LDX system. Connect DeviceNet communication and field power as per the wiring diagram. Use copper or copper-clad aluminum conductors and tighten terminal block screws to a maximum torque of 7 lb-in. The module supports up to two discrete expansion modules, enabling scalable I/O configurations. Ensure the DeviceNet power supply voltage stays within 11 to 28.8V dc to avoid operational issues.

Maintenance & Reliability

With no calibration required, this module reduces routine maintenance tasks. Inspect connections periodically for tightness and signs of corrosion. The module operates reliably within 0 to 55 °C ambient temperature, as indicated by the accuracy specification. The photocoupler isolation between I/O and logic provides robust protection against electrical noise, enhancing long-term stability.

Compatibility & Integration

It works with Allen-Bradley controllers and third-party DeviceNet masters. The module's binary data output (0000 to 0fff max scale) simplifies programming in most PLC environments. The four red/green I/O status indicators facilitate quick visual diagnostics during commissioning and operation.

Selection Guide & Purchasing Advice

When selecting this module, verify that your application requires 4-channel analog current input on DeviceNet. For projects needing higher channel counts or different signal types, consider other CompactBlock LDX modules. AutoDCSTech stocks the 1790D-TN4C0 and can assist with availability and lifecycle status. Contact our team to confirm stock and lead times before ordering.