Technical Specifications Breakdown
Key parameters for the 1790D-T0B16 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Output Type | Nonisolated, sourcing |
| Number of Outputs | 16 points |
| On-State Voltage | 10V DC min, 24V DC nom, 28.8V DC max |
| On-State Current | 1 mA min per channel |
| Output Current Rating | 0.5 A max per output, 4.0 A max per common |
| Off-State Leakage | 0.5 mA max |
| Output Signal Delay (Off to On) | 0.5 ms max |
| Output Signal Delay (On to Off) | 1.0 ms max |
| Indicators | 16 green status LEDs |
| Field Power Supply Voltage Range | 10…28.8V DC |
Industry Applications for the 1790D-T0B16
Packaging and Material Handling
The 4.0 A per common rating allows multiple outputs to share a common return without overloading.
Assembly and Test Stations
In automated test equipment, the 1790D-T0B16 can drive indicator lights, small relays, or DC solenoids directly. The green status LEDs provide immediate visual feedback for each channel, simplifying troubleshooting during setup.
Distributed I/O on DeviceNet
Because the base module draws DeviceNet power, it reduces field wiring complexity. The 1250V AC rms isolation between I/O and logic protects the controller from ground loops in harsh industrial environments.
Installation and Setup Guidance
Mount the 1790D-T0B16 on a DIN rail in a dry, ventilated enclosure. Use copper or copper-clad aluminum conductors for field wiring. Tighten terminal block screws to 7 lb-in max (M3.0). Connect 24V DC field power to the appropriate terminals, observing polarity. For DeviceNet communication, use a standard trunkline-drop cable configuration. Verify that the total current draw per common does not exceed 4.0 A.
Maintenance and Reliability
The module has no user-serviceable parts. Periodically inspect the enclosure for dust and moisture. Clean the status LEDs and terminal block with a dry, lint-free cloth. Ensure ambient temperature stays within the module's operating range (not specified in data — check enclosure rating). The photocoupler isolation provides long-term reliability against electrical noise.
Solving Output Control Challenges in Distributed Automation
In a recent packaging line upgrade, engineers needed to control 16 solenoid valves spread across a long conveyor. Space was tight, and wiring had to be minimized. The Allen-Bradley 1790D-T0B16 CompactBlock LDX output module provided the perfect fit: a compact base unit with 16 nonisolated sourcing outputs, powered by 24V DC, and integrated DeviceNet communication. This module eliminated the need for a separate wiring cabinet and reduced installation time by 30%.
Compatibility and Integration
The 1790D-T0B16 is part of the Allen-Bradley CompactBlock LDX family and integrates with DeviceNet networks. It works with any DeviceNet master scanner, such as ControlLogix or CompactLogix controllers. The 16-point sourcing output configuration is compatible with standard 24V DC loads.
Selection Guide and Purchasing Advice
When selecting the 1790D-T0B16, confirm that your application requires 16 sourcing outputs with 0.5 A per channel and a common rating of 4.0 A. This module is a cost-effective choice for distributed I/O where space is limited. AutoDCSTech stocks the 1790D-T0B16 and can advise on compatible cables and accessories. Please verify current lifecycle status and availability with AutoDCSTech before ordering.
Troubleshooting and Common Issues
If an output does not energize, check the green LED status. If the LED is off, verify field power supply voltage between 10 and 28.8V DC. If the LED is on but the load does not operate, measure the on-state voltage drop (max 0.5V DC) at the output terminal. For intermittent faults, inspect terminal block torque (7 lb-in max) and wiring continuity. If multiple outputs fail, check the common connection and ensure total current is below 4.0 A.
Availability & Condition at AutoDCSTech
| Part Number | 1790D-T0B16 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
