1794-PS1/A Allen-Bradley Isolated 24V DC Power Supply Module for FLEX I/O Systems

The Allen-Bradley 1794-PS1/A delivers isolated 24V DC power to FLEX I/O systems, eliminating loop interference in tight cabinets.

• 24V DC/1A Output: Safely powers up to 3 adapter modules without overcurrent risks
• 85-265V AC Input: Auto-selects between 120/230V nominal voltage globally
• 1500V AC Isolation: Blocks high-voltage spikes to prevent logic-side downtime

Technical Note: Total FLEX I/O backplane current must not exceed 1.0A. For setups with 4+ high-draw analog modules, check your combined load or use an upgraded 1794-PS3 supply.

Amikon supplies industrial automation spare parts, mainly PLC, DCS, and TSI systems, to more than 160 countries.

• North America: Steady demand, especially US and Canada. Oil & gas plants and automotive-related production sites
• Europe: Similar in scale, Germany and UK stand out. Chemical plants and heavy equipment lines placing regular orders
• Middle East and Africa: Refinery projects and mining sites. UAE, Saudi Arabia, South Africa in shipments and remote field installations
• Asia-Pacific: Broad demand from China, Singapore, Australia, India. Semiconductor fabs to power stations and metallurgy plants
• South America: Smaller volume but stable. Brazil, Chile, Argentina connected with mining, copper operations, and hydropower projects

Q: What is the primary function of the Allen-Bradley 1794-PS1/A module?

A: The 1794-PS1/A handles the power side of a FLEX I/O system. It is used to supply 24V DC power for the backplane and terminal bases. In older Allen-Bradley systems, replacing this single part is often enough to keep the existing setup running.

Q: What input and output ratings of 1794-PS1/A should be considered?

A: It works with 85-265V AC input, 50/60 Hz. The output rating is 24V DC and 1A maximum. For replacement work, the existing I/O load is normally checked before installation.

Q: Can one 1794-PS1/A run any FLEX I/O configuration?

A: Not always. The final limit depends on the connected modules and their power consumption. Once the load gets close to 1A, additional power support may be required.

Q: What about isolation protection of 1794-PS1/A?

A: The AC and DC sides are separated, with 1500V AC isolation. This helps reduce interference issues that may appear in industrial control environments.

Q: Why is the 1794-PS1/A still requested today?

A: The Series A unit is discontinued, but many plants still operate older FLEX I/O systems. Because of this, original surplus 1794-PS1/A stock and refurbished Allen-Bradley parts are still used for maintenance.