XBC/XEC-DR28UA/DC

Description

Ultimate/UA variant compact CPU with 16 digital inputs + 12 relay outputs plus integrated analog I/O, DC-powered (24 VDC) option for battery/plant-power panels.

The Polar Energy Assessment:

The DR28UA/DC is the UA-suffix member of the Ultimate XBC family, combining relay outputs and integrated analog channels in a single compact CPU. Typical feature set includes dual Ethernet, RS-232/RS-485 comms, datalog/SD support, advanced PID and high-speed counter capabilities, and up to 10 expansion stages for big single-rack systems; the /DC variant runs from 24 VDC making it suitable for DC plant or battery-backed skids. Confirm analog channel types (universal inputs, AO ranges) on the exact SKU before wiring.

Pros

• Mixed discrete + analog in one CPU saves modules and wiring.
• Ultimate feature set: Ethernet, PID, high-speed counters and datalog.
• DC option for remote skids and battery-backed systems.

Limitations

• Relay outputs are great for isolation but wear mechanically under very high cycle rates.
• Integrated analogs are limited channel counts; bulk analog systems still need expansion modules.

Typical use cases

• Remote skids with mixed analog and discrete I/O, AHU/chiller controllers that need a few analog loops plus pilot relays, and compact plant controllers requiring Ethernet and datalog.