Allen-Bradley 1790D-0W6 - 6-Channel Relay Output Module for DeviceNet

Switch and control diverse loads with the Allen-Bradley 1790D-0W6. This robust ArmorBlock module provides 6 independent Form A (SPST-NO) relay outputs on your DeviceNet network. Its relays can handle both AC and DC loads, making it incredibly versatile for controlling indicators, small motors, solenoids, and other devices up to 2.0 Amps. With high electrical isolation and individual status lights, it's a reliable choice for mixed voltage applications.

Key Advantages

• AC/DC Load Flexibility: Each relay contact can switch both AC (up to 30V AC) and DC (5-28.8V DC) loads, simplifying inventory and design for mixed systems.
• High Current Capacity: Rated for 2.0 Amps per channel, providing solid power to drive a wide range of industrial actuators directly.
• Complete Electrical Isolation: Photocoupler isolation (1250V AC) separates the sensitive network logic from the load side, protecting your control system from voltage spikes and noise.
• Independent Relay Contacts: Six Form A (Normally Open) relays with separate commons offer maximum wiring flexibility and circuit isolation between loads.

Complete Technical Specifications

Brand & Series: Allen-Bradley ArmorBlock (1790 Series)

Full Model Number: 1790D-0W6

Module Type: 6-Channel Relay Output Module

Relay Type: Form A (Single Pole, Single Throw, Normally Open - SPST-NO)

Contact Rating: 2.0 A @ 30V AC resistive, 2.0 A @ 28.8V DC resistive

Load Voltage Range: 5...28.8V DC or up to 30V AC

Minimum Load: 100 µA, 100 mV DC (for reliable contact wetting)

Switching Speed: Operate/Release Time: 10 ms maximum

Expected Mechanical Life: 10,000,000 operations minimum

Expected Electrical Life: 300,000 cycles (resistive load), 100,000 cycles (inductive load)

Status Indicators: 6 individual Green LEDs (one per relay channel)

DeviceNet Logic Power: 24V DC (11V - 28.8V range)

Coil Power (Field): 24V DC (19.2V - 28.8V range)

Electrical Isolation: 1250V AC RMS (Relay contacts to logic)

Wiring Connection: 37-pin D-shell connector

Installation & Wiring Guide

Mount the 1790D-0W6 module on a DIN rail. Connect the 24V DC field power to energize the relay coils. Wire your load (e.g., a lamp or small contactor) in series with the relay's Normally Open (NO) contact and your load power source (AC or DC, within ratings). Each relay has its own common terminal, allowing you to switch different voltage systems on different channels. Always use suppression (like an RC snubber or diode) for inductive loads to protect the relay contacts.

Package & Warranty

What's Included: 1 x Allen-Bradley 1790D-0W6 Relay Output Module.

Our Guarantee: This product is covered by a solid 12-month warranty.

Fast Shipping Options

We deliver quickly using reliable couriers: FedEx, UPS, and DHL.

Frequently Asked Questions (FAQ)

What does "Form A" relay mean?

Form A means Single Pole, Single Throw, Normally Open (SPST-NO). The contact is open when the relay coil is off and closes to make a connection when the coil is energized.

Can I switch 120V AC with this module?

No. The relay contacts are rated for a maximum of 30V AC or 28.8V DC. Applying higher voltage will damage the module and is a safety hazard. For higher voltages, use this relay to control an intermediate contactor.

Why is there a minimum load requirement?

A very small load (<100 µA) may not provide enough current to "wet" the contacts and break through surface oxidation, leading to unreliable switching. For dry circuit applications, use gold-plated relay contacts.

How do the status LEDs work?

Each green LED turns on when its corresponding relay coil is energized by the module's logic, indicating a command to close the contact. It does not confirm the physical contact has closed or that load current is flowing.

What is the main advantage over solid-state outputs?

The key advantage is complete galvanic isolation and the ability to switch AC or DC loads of different voltages on the same module. Solid-state outputs are typically faster and have longer life but are usually restricted to DC and one polarity.

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