XBC/XEC-DR20E

Description

E-class compact CPU in the 20-point class, typically 12 DI + 8 relay outputs; an economical relay-output main unit for small but slightly larger panels.

The Polar Energy Assessment:

DR20E offers a larger local I/O footprint within the E family, while maintaining the E-class limitations: modest program space (~4k steps), slower cycle time (≈240 ns/step) and straightforward built-in functions (program port, peripheral serial, basic HSC and pulse catch). It’s a practical choice when you need more local points and relay outputs but still want the low cost and small footprint of the E series. Confirm the exact DI/DO split and power-supply variant on the quote.

Pros

• Higher local point count than smaller E models while retaining relay outputs for isolated switching.
• Inexpensive and simple to commission.

Limitations

• Still constrained by E-class memory and performance; avoid for complex logic or heavy HSC/PID demands.

Typical use cases

• Larger small-machine controllers, AHU pilot panels with many discrete points, alarm panels and applications where multiple relay outputs are required without SU/H level performance.