Delta AH CPU 521-RS2, 192k-step program capacity / AHCPU521-RS2

AHCPU521-RS2: CPU 521-RS2, 192k-step program capacity. Selected specifications follow the exact manufacturer catalogue row. Confirm hardware/firmware compatibility, installation requirements and current supply before ordering.

Manufacturer part number: AHCPU521-RS2
Brand: Delta
Category: PLC and HMI
Catalog status: Request a quotation

Technical specifications

Controller family: Delta AH
Local I/O capacity: 2304 points maximum; system capacity, not onboard I/O
Program capacity: 192k steps
Data register D: 96k words
Latched register L: 96k words
Function block register B: 2048k words; reserved for function blocks
Maximum function blocks: 2048
Maximum extension backplanes: 3
LD instruction execution time: 0.02 microseconds
Internal power consumption: 2.9 W
Serial communication ports: 2 x RS-232 / RS-422 / RS-485 multi-mode
Serial communication speeds: RS-232 up to 115.2 kbps; RS-422/485 up to 921.6 kbps
Protocols: Modbus RTU / ASCII
SD card capacity: 32 GB maximum
Programming interface: Mini-USB
Document pages: PDF 37
Current lifecycle status: Not established by historical catalogue; confirm separately

Manufacturer technical catalog · Delta AH Series catalogue; exact model technical/ordering table on PDF 37 · en · PDF · DELTA_IA-PLC_AH_C_EN_20210811Manufacturer source: Delta · Model explicitly covered in family document · Covered models: AHCPU521-RS2 · Checked: 2026-10-22Official manufacturer source

This sheet provides a quick technical summary. For design, installation and final selection, review the latest official manufacturer documentation and verify the complete part number.