Product Overview
The Allen-Bradley 1790D-T0W6 is a 6 Relay Output Base Module designed for demanding industrial control applications. This compact module provides six Form A (normally open, single pole, single throw) relay outputs, making it a reliable choice for switching loads in automation systems. With a wide output voltage range and robust isolation, the 1790D-T0W6 delivers dependable performance in PLC and DCS environments.
Engineered for longevity, the 1790D-T0W6 features an expected contact life of 300 Kcycles resistive and 100 Kcycles inductive, ensuring minimal downtime. Its photocoupler isolation between I/O and logic protects sensitive control circuits, while the terminal block wiring simplifies installation. Whether you are upgrading an existing panel or building a new system, the Allen-Bradley 1790D-T0W6 offers a cost-effective solution for relay output requirements.
Technical Specifications
Below are the key specifications for the Allen-Bradley 1790D-T0W6, ensuring you have accurate data for your engineering decisions.
| Parameter |
Value |
| Relay Type |
Form A, normally open, single pole, single throw |
| Output Voltage Range (load dependent) |
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 (max) |
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 (max) |
1.5 mA max |
| Output Delay Time |
Off to On: 10 ms max; On to Off: 10 ms max |
| Indicators |
6 green status LEDs |
| Common Type |
1 point/1COM |
| DeviceNet Power Supply Voltage |
24V dc nominal; range 11…28.8V dc |
| DeviceNet Power Dissipation |
1.2 W max @ 28.8V dc |
| Field Power Supply Voltage |
24V dc nominal; range 19.2…28.8V dc |
| Field Power Dissipation |
10 mA @ 28.8V dc per channel |
| Isolation |
I/O to logic: photocoupler isolation; isolation voltage: 1250V ac rms |
| Wiring |
Terminal block (M3.0); screw torque: 7 lb-in max (use copper or copper-clad aluminum conductors) |
Reliability and Maintenance
The 1790D-T0W6 is built for reliability, with a contact life of 300 Kcycles resistive, reducing the frequency of replacements. Its photocoupler isolation protects the logic side from voltage spikes, extending the module's service life. To maintain optimal performance, periodically inspect the terminal block connections and ensure the screw torque does not exceed 7 lb-in. Verify that the field power supply remains within the specified 19.2…28.8V dc range to prevent relay damage. The green status indicators allow quick visual checks of output states, simplifying troubleshooting.
Installation and Wiring
Installation of the Allen-Bradley 1790D-T0W6 is straightforward. Mount the module securely in your control panel, then connect the field wiring to the M3.0 terminal block. Use copper or copper-clad aluminum conductors and tighten screws to a maximum of 7 lb-in. Ensure the DeviceNet power supply is within 11…28.8V dc and the field power within 19.2…28.8V dc. The output delay of 10 ms (both off-to-on and on-to-off) should be considered in your control logic timing. Always verify the load requirements match the relay's 2.0 A rating to avoid overcurrent conditions.
Selection Guide
When selecting a relay output module, confirm that the output voltage and current match your load specifications. The 1790D-T0W6 handles up to 2.0 A resistive across a wide voltage range, making it versatile for many AC and DC loads. Check the common type (1 point/1COM) to ensure it fits your wiring scheme. For bulk orders or technical support, PLC Source PRO offers competitive pricing and reliable delivery for the Allen-Bradley 1790D-T0W6 and other automation spares.