XBC/XEC-DR20SU

Description

SU-class compact CPU with 12 DC inputs and 8 relay outputs, SU performance class (PID, HSC, positioning) and expanded I/O capability compared with E-type units.

The Polar Energy Assessment:

DR20SU is a standard (SU) tier XBC/XEC compact main unit that pairs modest local I/O with genuine control headroom; expect ~15k step program capacity and SU-class execution speed, plus built-in PID, high-speed counters and positioning blocks. It is intended for medium-complexity panels where relay outputs are needed together with SU-level processing and expansion options.

Pros

• Relay outputs for galvanically isolated switching, useful for pilot circuits.
• SU-class features: PID, HSC and positioning, more capable than E-type.
• Good expansion headroom for compact installations.

Limitations

• Mechanical relay outputs have limited life under very high cycle rates; plan maintenance.
• More expensive than E-class; overkill if you only need a few simple I/O points.

Typical use cases

• AHU pilot panels requiring isolated outputs, medium machines with PID loops, pilot/annunciation racks in small plants.