Product Overview

The 1790D-0W6 is a 6-relay output base module from Allen-Bradley, designed for reliable switching in industrial automation systems. This module features Form A, normally open contacts with single pole, single throw configuration, making it suitable for controlling resistive loads in demanding environments. As part of the CompactBlock LDX series, it integrates seamlessly with DeviceNet networks.

Technical Specifications Analysis

The 1790D-0W6 operates with an output voltage range of 5…28.8V dc at 2.0 A resistive and 30V ac at 2.0 A resistive. It supports a minimum load of 100 µA and 100 mV dc per input. The on-state voltage drop is a maximum of 0.5V at 2.0 A with a resistive load at 24V dc. Initial contact resistance is 30 mΩ, and expected contact life reaches 300 Kcycles resistive or 100 Kcycles inductive. Off-state leakage is a maximum of 1.5 mA. Output delay times are 10 ms maximum for both Off to On and On to Off transitions. The module includes 6 green status indicators and uses a 1 point/1 COM common type. For general specifications, the DeviceNet power supply requires 24V dc nominal with a voltage range of 11…28.8V dc and power dissipation of 1.2 W max at 28.8V dc. Field power supply also requires 24V dc nominal with a voltage range of 19.2…28.8V dc and power dissipation of 10 mA at 28.8V dc per channel. Isolation is provided via photocoupler with an isolation voltage of 1250V ac rms. Wiring uses a 37-pin D-shell connector.

Application Scenarios & Usage Methods

In oil and gas facilities, the 1790D-0W6 controls solenoid valves and alarm systems, leveraging its 2.0 A resistive load capacity at 24V dc. For manufacturing lines, it manages indicator lights and small relay coils, benefiting from the 10 ms output delay for precise timing. Use the module by connecting field devices to the 37-pin D-shell connector and configuring the DeviceNet network for communication.

Installation Guide & Packing List

Mount the 1790D-0W6 on a DIN rail in a clean, dry enclosure. Connect the DeviceNet power supply (24V dc nominal) and field power supply (24V dc nominal) within specified voltage ranges. Wire outputs using the 37-pin D-shell connector, ensuring proper isolation. The package includes the 1790D-0W6 base module and a 37-pin D-shell connector. No additional accessories are included.

Purchasing Advice

When selecting the 1790D-0W6, verify your load requirements match the 2.0 A resistive rating at 5…28.8V dc or 30V ac. For inductive loads, consider the 100 Kcycles expected contact life. PetroPartsOnline offers this module with fast shipping and expert support for industrial automation needs.

Repair & Maintenance Tips

Inspect the 1790D-0W6 regularly for signs of wear on relay contacts, especially after high-cycle operations. Clean the module with a dry cloth and ensure the enclosure remains free of dust and moisture. Store the module in a static-safe environment when not in use. Replace the module if output delay times exceed 10 ms or if contact resistance rises above 30 mΩ.

Frequently Asked Questions (FAQs)

Q: What is the output voltage range for the 1790D-0W6?

A: The output voltage range is 5…28.8V dc at 2.0 A resistive and 30V ac at 2.0 A resistive.

Q: How many relays does the 1790D-0W6 have?

A: It has 6 relays with Form A, normally open contacts.

Q: What is the expected contact life for resistive loads?

A: The expected contact life is 300 Kcycles for resistive loads.

Q: What type of isolation does the module provide?

A: It provides photocoupler isolation with an isolation voltage of 1250V ac rms.

Q: What connector does the 1790D-0W6 use for wiring?

A: It uses a 37-pin D-shell connector.