Product Overview
The Allen-Bradley 1790-T0B16X is a 24V DC 16-point sourcing output base and expansion module designed for industrial control systems. This compact unit provides 16 nonisolated sourcing outputs, each rated at 0.5A max, with a common rating of 4.0A per 8-point group.
Technical Specifications Breakdown
Key parameters for the 1790-T0B16X are listed below for quick reference:
| Feature | Specification |
|---|---|
| Output Type | Discrete Outputs |
| Number of Channels | 16 Channels |
| Output Configuration | Nonisolated, Sourcing |
| On-State Voltage | 10V DC min, 24V DC nom, 28.8V DC max |
| On-State Voltage Drop | 0.5V DC max |
| On-State Current | 1 mA min per channel |
| Off-State Voltage | 28.8V DC max |
| 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 |
| Output Current Rating | 0.5 A max per output, 4.0 A max per common |
| Common Type | 8 points/8 COM |
| Supply Voltage (Base Module) | 24V DC nom, 11…28.8V DC range |
| Power Dissipation (Base Module) | 1.2 W max @ 28.8V DC |
| Field Power Supply Voltage | 24V DC nom, 10…28.8V DC range |
| Field Power Dissipation | 6 mA @ 28.8V DC per point |
| Isolation | I/O to logic: photocoupler isolation, 1250V AC rms |
| Wiring | Terminal block (M3.0), screw torque: 7 lb-in max |
Industry Applications
The 16-point density reduces panel space while maintaining per-channel current capacity for medium-load actuators. In automotive assembly stations, it controls pneumatic valves with fast 0.5 ms off-to-on response. For food and beverage packaging, the nonisolated design simplifies wiring when loads share a common return.
Installation & Setup Guidance
Mount the 1790-T0B16X on a DIN rail within the specified environmental limits. Use copper or copper-clad aluminum conductors with M3.0 terminal screws tightened to 7 lb-in max. Connect the DeviceNet power supply within 11…28.8V DC to the base module. For field power, apply 10…28.8V DC to the output commons. Each common group (8 points) can sink up to 4.0A total. Verify polarity before power-up to avoid damage.
Maintenance & Reliability
Periodically inspect terminal connections for tightness and signs of corrosion. Clean the module enclosure with a dry cloth; avoid solvents. Monitor the 16 green status LEDs for output health. The photocoupler isolation (1250V AC rms) protects logic circuits from field transients. Replace the module if output channels fail to switch or if the power dissipation exceeds 1.2W at 28.8V DC.
Compatibility & Integration
This module integrates with Allen-Bradley DeviceNet networks as a base or expansion unit. It communicates via the DeviceNet protocol, allowing seamless data exchange with controllers like CompactLogix or ControlLogix. The 16 sourcing outputs interface directly with 24V DC loads without external pull-up resistors. Ensure the DeviceNet scanner configuration matches the module's I/O mapping.
Selection Guide & Purchasing Advice
When selecting the 1790-T0B16X, verify your system voltage (24V DC nominal) and output current requirements (0.5A per output, 4.0A per common). For applications needing isolated outputs, consider alternative modules. AutoDCSTech stocks this module with fast shipping and expert support. Contact our team to confirm availability and lifecycle status before ordering.
Troubleshooting & Common Issues
If outputs fail to energize, check the field power supply voltage (10…28.8V DC) and common connections. A green LED that remains off indicates a blown fuse or open load. For intermittent operation, measure the on-state voltage drop (max 0.5V DC) at the output terminal. Excessive leakage (over 0.5 mA) suggests a faulty output channel; replace the module. Verify the DeviceNet power supply is within 11…28.8V DC and the network termination is correct.
Availability & Condition at AutoDCSTech
| Part Number | 1790-T0B16X |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
