Allen-Bradley 1790D-T4T0 | CompactBlock LDX I/O Module

Product Overview: Allen-Bradley 1790D-T4T0 Thermocouple Base Module

Key Technical Specifications and Features

• Brand & Model: The module is manufactured by Allen-Bradley under the model number 1790D-T4T0.
• Input Channels: It provides four completely independent input channels for temperature measurement.
• Compatible Sensors: The module works with a wide range of thermocouple types, including J, K, T, E, N, R, S, B, and linear millivolt inputs.
• High Resolution: A 20-bit Sigma-Delta converter ensures high-resolution data with 16-bit output, scaled at 0.1°C or 0.1°F per bit.
• Measurement Accuracy: It maintains an impressive overall accuracy of 0.2% of full scale within its operating temperature range.
• Fast Scanning: The module scans all four channels every 140 milliseconds for near real-time data updates.
• Advanced Filtering: A configurable notch filter (10, 25, 50, 60, 100, 250, 500 Hz) helps eliminate electrical noise for stable readings.
• Diagnostic Feature: Built-in open wire detection immediately flags sensor connection issues as an "out of range" status.

Detailed Operating Parameters

• Input Signal Range: The module accepts a voltage range from -76.50 mV to +76.50 mV.
• Temperature Ranges: Each thermocouple type has a specific valid range, for example, Type K from -270 to 1370°C and Type J from -210 to 1200°C.
• Cold Junction Compensation: This feature is active across a range of 0 to 70°C for accurate ambient temperature correction.
• Power Requirements: The DeviceNet side operates on 24V DC nominal (11V DC minimum). Separate field power is 24V DC nominal (21.6 - 26.4V DC).
• Operating Environment: The module functions reliably in ambient temperatures from 0 to 55 degrees Celsius.
• Electrical Isolation: It features photocoupler isolation (1250V AC for 60s) between I/O and logic circuits for safety.
• Connection & Wiring: It uses a terminal block with M3.0 screws, with a maximum torque of 7 lb-in. Use copper or copper-clad conductors.

Frequently Asked Questions (FAQ)

• Q: Is this module brand new and authentic?
  A: Yes, we supply only 100% new, genuine, and original Allen-Bradley products.
• Q: How many temperature sensors can I connect?
  A: The 1790D-T4T0 provides four separate channels, so you can connect up to four different thermocouples.
• Q: What thermocouple types does it support?
  A: It supports common types like J, K, T, E, N, R, S, B, and also accepts direct millivolt voltage signals.
• Q: Do you have this item in stock?
  A: Yes, we typically have this module in stock and ready for immediate shipment.
• Q: How quickly will my order ship?
  A: We process and ship orders within 5 business days after payment confirmation.
• Q: What is your return policy?
  A: We offer a 30-day return policy for unused items in their original packaging.
• Q: What is the module's scan rate?
  A: It scans all four input channels every 140 milliseconds, providing fast data updates.
• Q: Can it detect a broken sensor wire?
  A: Yes, the module features open wire detection and will report the issue to the controller.

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