Product Overview
A manufacturing line experienced intermittent relay failures causing unplanned downtime. The Allen-Bradley 1790D-T0W6 6 Relay Output Base Module provides a reliable solution for switching resistive loads up to 2.0 A across a wide voltage range. This compact module integrates six Form A (normally open) single-pole single-throw relays, each with its own common terminal, making it suitable for distributed control architectures.
Technical Specifications Breakdown
Key parameters for the 1790D-T0W6 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Relay Type | Form A, normally open, single pole, single throw |
| Output Voltage Range | 5…24V dc @ 2.0 A resistive; 30V ac @ 2.0 A resistive; 125V ac @ 2.0 A resistive; 250V ac @ 2.0 A resistive |
| Output Current Rating | 2.0 A @ 5…24V dc resistive; 2.0 A @ 30V dc resistive |
| Minimum Load | 100 µA, 100mV dc per input |
| On-State Voltage Drop | 0.5V @ 2.0 A, resistive load, 24V dc |
| Initial Contact Resistance | 30 MΩ |
| Expected Contact Life | 300 Kcycles resistive; 100 Kcycles inductive |
| Off-State Leakage | 1.5 mA max |
| Output Delay Time | Off to On: 10 ms max; On to Off: 10 ms max |
| Indicators | 6 green status |
| Common Type | 1 point/1COM |
| DeviceNet Power Supply Voltage | 24V dc nom; range 11…28.8V dc |
| DeviceNet Power Dissipation | 1.2 W max @ 28.8V dc |
| Field Power Supply Voltage | 24V dc nom; range 19.2…28.8V dc |
| Field Power Dissipation | 10 mA @ 28.8V dc per channel |
| Isolation | I/O to logic: photocoupler isolation; 1250V ac rms |
| Wiring | Terminal block (M3.0); screw torque 7 lb-in max; use copper or copper-clad aluminum conductors |
Industry Applications
In a packaging line, it can control solenoid valves and indicator lights directly from a DeviceNet network. The 2.0 A resistive rating supports most pilot devices, while the 300 Kcycle resistive life ensures long-term reliability. For material handling systems, the module's 1 point/1COM configuration simplifies wiring by dedicating one common per relay.
Installation & Setup Guidance
Mount the module securely using the provided terminal block with M3.0 screws. Torque each screw to 7 lb-in maximum using copper or copper-clad aluminum conductors. Connect the DeviceNet power supply within 11…28.8V dc and the field power within 19.2…28.8V dc. Observe polarity: the module expects 24V dc nominal on both supplies. Use the six green status indicators to verify power and output activation.
Maintenance & Reliability
Periodically inspect the terminal block connections for tightness and signs of corrosion. The photocoupler isolation (1250V ac rms) protects logic circuits from field transients. For inductive loads, expect 100 Kcycles contact life; derate accordingly for high-inrush applications. Keep the enclosure free of conductive dust to prevent leakage paths.
Compatibility & Integration
The 1790D-T0W6 integrates directly with DeviceNet networks using the built-in power supply. It accepts 24V dc nominal from the network and provides isolated outputs. The module is part of the Allen-Bradley 1790D series of compact distributed I/O blocks. No additional communication modules are required for basic operation.
Selection Guide & Purchasing Advice
When selecting a relay output module, verify the load type (resistive vs. inductive) and voltage range. The 1790D-T0W6 covers 5-250V AC/DC at 2.0 A resistive. For lower currents or different voltages, consider other 1790D variants. AutoDCSTech stocks this module and can confirm current lifecycle status and availability before ordering.
Availability & Condition at AutoDCSTech
| Part Number | 1790D-T0W6 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
