Configured for analog voltage signal acquisition in DeviceNet distributed control networks, the Allen-Bradley 1790D-TN4V0 (1790D-TN4V0 CompactBlock LDX 4 A/I Base Block) provides direct physical signal processing for 4 single-ended input channels. The hardware executes unipolar analog-to-digital conversion at 12-bit resolution to maintain data integrity across the fieldbus communication interface.

Hardware Specifications

Industrial Control Integration and Scalability

The 1790D-TN4V0 functions within the DeviceNet ecosystem, utilizing deterministic communication protocols to manage field I/O data. The modularity of the CompactBlock LDX platform allows for efficient I/O density scaling during network configuration. Firmware compatibility ensures that the analog data registers are correctly mapped and processed by the primary controller, supporting high-speed cyclic data exchange while maintaining the precision required for voltage-based industrial instrumentation.

Field Installation Procedures

• Mounting: Secure the base block to a flat surface or DIN rail using the provided enclosure mounting points.

• Wiring: Connect analog voltage signals to the specified input terminals, ensuring that all signal wiring is kept at least 15 cm away from high-voltage AC cables.

• Grounding: Terminate cable shields at a central ground reference to mitigate electromagnetic interference, as the inputs are non-isolated.

• Power: Supply 24 VDC (11 to 28.8 VDC range) to the module power terminals and verify voltage levels before initializing DeviceNet communications.

• Enclosure: Maintain the IP20 rating by ensuring all field connectors are fully seated and protected from environmental debris.

Ordering Information

• Contents: One (1) 1790D-TN4V0 Base Block.

• Additional requirements: Requires a standard DeviceNet trunk line cable and mating connectors for I/O signal termination.

Frequently Asked Technical Questions

Q: Are the 4 analog input channels galvanically isolated from each other?

A: No, the 1790D-TN4V0 features 4 single-ended, non-isolated input channels that share a common ground reference.

Q: Can this module be hot-swapped while the DeviceNet network is active?

A: This module does not support hot-swapping; power must be disconnected from the base block before removal to prevent potential damage to the DeviceNet bus interface.

Q: How is the input signal processed for accuracy?

A: The module uses a 12-bit unipolar Sigma-Delta conversion method to transform 0-10 V signals into digital values, ensuring an overall accuracy of 0.2% full scale across the operating temperature range.