Mitsubishi A1S71AP21-S3 — The A1S71AP21-S3 is a PLC unit from Mitsubishi’s A Series

Part number	A1S71AP21-S3
Brand	Mitsubishi
Category	PLC Module
Description	The A1S71AP21-S3 is a PLC unit from Mitsubishi’s A Series
Manufacturer	Mitsubishi
Product Line	A Series
Part Number	A1S71AP21-S3
Product Category	PLC UNIT
Programming Language	Ladder Logic (LD)
Program Capacity	2K steps (built-in memory)
I/O Points	Up to 128 points (maximum)
Memory Type	Built-in ROM, expandable with RAM card (battery-backed)
Operating Temperature	0°C to 55°C
Storage Temperature	-25°C to 75°C
Humidity	10% to 90% RH (non-condensing)
Communication Ports	RS232C (integrated communication port)
Processing Speed	Approximately 0.75 μs per logical instruction

The A1S71AP21-S3 is a PLC unit from Mitsubishi’s A Series. It utilizes Ladder Logic programming to facilitate automation tasks. With a program capacity of 2K steps, this unit efficiently manages up to 128 I/O points.

Compatibility data for this part number is being verified. Send an RFQ with your equipment model and serial — our suppliers confirm fitment before quoting.

Data compiled from 1 verified source. Last reviewed 2026-08-16.