Product Overview
The Allen-Bradley 1790D-0W6 is a 6-relay output base module designed for industrial automation applications. Part of the CompactBlock LD series, this module provides six independent Form A (normally open, single-pole single-throw) relay outputs, each capable of switching loads up to 2.0 A. With a wide output voltage range of 5…28.8V dc or 30V ac, the 1790D-0W6 offers flexible integration into various control systems.
Engineered for reliability, the 1790D-0W6 features photocoupler isolation between I/O and logic, with an isolation voltage of 1250V ac rms, ensuring safe operation in demanding industrial environments. Its compact form factor and 37-pin D-shell connector simplify wiring and installation.
Key Features & Benefits
-
Form A relay outputs: Each of the six channels is normally open and single-pole single-throw, providing simple and reliable switching.
-
Wide load range: Supports 5…28.8V dc or 30V ac at 2.0 A resistive loads, accommodating diverse actuator and load requirements.
-
Fast switching: Output delay time of 10 ms max for both off-to-on and on-to-off transitions.
-
Robust isolation: Photocoupler isolation with 1250V ac rms rating protects logic circuits from field transients.
-
Status indicators: Six green LEDs provide clear visual feedback for each output channel.
-
Long contact life: Rated for 300K cycles resistive and 100K cycles inductive, reducing maintenance frequency.
Technical Specifications
| Parameter |
Value |
| Relay type |
Form A, normally open, single pole, single throw |
| Output voltage range (load dependent) |
5…28.8V dc @ 2.0 A resistive; 30V ac @ 2.0 A resistive |
| Output current rating (at rated power) |
2.0 A @ 5…28.8V dc resistive; 2.0 A @ 30V ac resistive |
| Minimum load |
100 µA, 100 mV 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 |
| Output delay time |
Off to On: 10 ms max; On to Off: 10 ms max |
| Indicators |
6 green status LEDs |
| Common type |
1 point/1 COM |
| 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 |
37-pin D-shell connector |
Industry Applications
The Allen-Bradley 1790D-0W6 is ideal for applications requiring reliable discrete switching, such as:
-
Material handling systems: Control conveyor motors, solenoids, and indicator lights.
-
Packaging machinery: Actuate pneumatic valves and alarms.
-
Process control: Switch pumps, heaters, and other field devices.
With its 2.0 A rating and wide voltage range, the 1790D-0W6 can handle both DC and AC loads, making it a versatile choice for mixed-load panels.
Installation & Setup Guidance
Mount the 1790D-0W6 on a standard DIN rail or panel. Connect field wiring to the 37-pin D-shell connector, ensuring proper torque and strain relief. Provide 24V dc power to both DeviceNet and field power terminals, observing polarity. Verify that loads are within the specified voltage and current limits. Use the green status LEDs to confirm channel operation during commissioning.
Maintenance & Reliability
Periodically inspect relay contacts for wear, especially in inductive load applications. The 1790D-0W6's expected contact life of 300K resistive cycles reduces downtime. Keep the module clean and free from dust, and ensure adequate ventilation to maintain optimal thermal performance. Check wiring connections for tightness during routine preventive maintenance.
Selection Guide & Purchasing Advice
Before ordering, confirm your system's power requirements and load characteristics match the 1790D-0W6's specifications. Verify the DeviceNet network compatibility with your PLC or scanner. When sourcing, choose a trusted supplier like PLC Source PRO to ensure genuine Allen-Bradley 1790D-0W6 modules and reliable support.