Description

The Honeywell 05704-A is a robust 24VDC power supply module designed for Honeywell’s legacy TDC 3000 and TotalPlant Solution (TPS) distributed control systems. It delivers stable, regulated power to HPM (High Performance Manager) and HPMM (Redundant HPM) controller racks, supporting critical I/O, processor, and communication cards with up to 5A of continuous current.

Though unassuming in appearance, the Honeywell 05704-A is the silent guardian of system uptime—providing clean, isolated power with built-in redundancy, fault signaling, and industrial-grade protection against surges, overloads, and thermal stress.

Application Scenarios

At a Gulf Coast refinery running a 25-year-old TPS system, a sudden cascade trip shut down a crude distillation unit during peak production. Investigation revealed that an aging third-party power module had failed silently—its output drooped below 22V, causing CPU resets across the HPM rack. The plant replaced it with a genuine Honeywell 05704-A, which immediately restored stable 24.1V operation and triggered the POWER OK relay, confirming health to the alarm system. Since then, the site has mandated Honeywell 05704-A as the only approved spare for all TPS power bays. As one senior controls engineer put it: “In a TPS world, your system is only as strong as its weakest power supply—and the Honeywell 05704-A is anything but weak.