Allen-Bradley 1790-0W8X 8-Relay Output Module

Allen-Bradley 1790-0W8X 8-Relay Output Expansion Module

Core Technical Specifications

• Brand & Model: This module is part of the trusted Allen-Bradley 1790 series, specifically model 1790-0W8X.
• Relay Configuration: It integrates eight single-pole, single-throw (SPST) Form A relays. These relays are normally open (NO).
• Switching Capacity: Each relay handles up to 2.0 A at 5-24V DC or 30V AC, suitable for resistive loads.
• Voltage Drop & Resistance: The on-state voltage drop is a low 0.5V maximum. Initial contact resistance starts at only 30 mΩ.
• Response Time: Both turn-on and turn-off delay times are a fast 10 milliseconds maximum.
• Isolation & Protection: Photocoupler isolation provides 1250V AC RMS between I/O and logic circuits for safety.

General Performance & Environmental Data

• Power Supply: The module requires a 24V DC nominal field power source, with an operating range from 19.2 to 28.8V DC.
• Durability: Expect a long service life of 300,000 cycles with resistive loads and 100,000 cycles with inductive loads.
• Leakage Current: Off-state leakage current remains below 1.5 mA maximum.
• Minimum Load: A very small minimum load of 100 µA at 100 mV DC ensures reliable operation for sensitive circuits.
• Wiring & Indicators: Connection is simple via a 37-pin D-shell connector. Eight green LEDs give clear status indication for each output channel.

Frequently Asked Questions (FAQ)

Q: What is the switching current rating of each relay?

A: Each relay on the 1790-0W8X can switch up to 2.0 Amps at both low-voltage DC (5-24V) and 30V AC levels.

Q: How do I wire this output expansion module?

A: You connect all field device wires to the provided 37-pin D-shell connector. Each output has one common (COM) point.

Q: What power supply does this module need?

A: It operates on a 24V DC nominal supply. The module can function correctly within a range of 19.2V to 28.8V DC.

Q: What is your return policy?

A: We offer a 30-day return policy for unused items in original condition. Please contact our sales team to initiate a return.

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