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

Product Positioning

• The Allen-Bradley 1790D-T4T0 module focuses on precise temperature input for DeviceNet-based automation systems.
• This CompactBlock LDX module connects directly to thermocouples without external signal conditioners.
• Engineers select this module for stable millivolt signal capture in harsh industrial environments.

Measurement Capability

• The module supports four independent thermocouple or millivolt input channels.
• Input voltage ranges from -76.50 mV to +76.50 mV for accurate low-level signal reading.
• A 20-bit sigma-delta converter ensures smooth and reliable temperature data conversion.

Supported Thermocouple Types

• Compatible sensors include Type B, E, J, K, R, S, T, and N thermocouples.
• Measurement resolution reaches 0.1°C per bit for detailed temperature monitoring.
• Cold junction compensation operates across a 0 to 70°C ambient range.

Accuracy and Signal Processing

• Overall accuracy reaches 0.2 percent of full scale within 0 to 55°C operation.
• The module scans each channel every 140 milliseconds for timely data updates.
• Selectable notch filters reduce noise at 10, 25, 50, 60, 100, 250, or 500 Hz.

Electrical and Isolation Design

• DeviceNet supply voltage runs at 24V DC nominal with an 11 to 28.8V DC range.
• Photocoupler isolation protects I/O circuits up to 1250V AC RMS.
• Non-isolated DeviceNet power simplifies system wiring and layout.

Diagnostics and Reliability

• Open wire detection reports faults directly as out-of-range processor values.
• Red and green LEDs display clear I/O and module operating status.
• Input impedance remains stable at 5 megaohms for signal integrity.

Installation Details

• The module uses M3.0 screw terminals for secure industrial wiring connections.
• Maximum terminal torque stays at 7 lb-in for conductor safety.
• Compact housing supports dense panel layouts and clean cable routing.

Package Contents and Warranty

• One Allen-Bradley 1790D-T4T0 CompactBlock LDX thermocouple base module.
• Factory-installed terminal block for quick field installation.
• Standard 12-month warranty included for quality assurance.
• Shipping options include FedEx, UPS, and DHL worldwide.

Professional FAQ

• Can the module handle mixed thermocouple types at the same time?
• Yes, each channel independently supports different thermocouple sensor types.
• Does the module filter electrical noise from nearby equipment?
• Yes, configurable notch filters reduce interference from common industrial frequencies.
• How does the module report sensor wiring failures?
• The system flags open wire conditions as out-of-range temperature values.
• Is the module suitable for continuous operation?
• Yes, the design supports stable 24/7 industrial temperature monitoring.
• Does the module require external signal converters?
• No, the module directly processes millivolt thermocouple signals.

Contact Information

• Email: info@oiltechcontrols.com
• WhatsApp: +86 158 8020 0923

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