Mitsubishi A3ACPUP21 — The A3ACPUP21 is an optical data link module utilized in Mitsubishi's A Series

Part number	A3ACPUP21
Brand	Mitsubishi
Description	The A3ACPUP21 is an optical data link module utilized in Mitsubishi's A Series
Manufacturer	Mitsubishi
Product Line	A Series
Part Number	A3ACPUP21
Weight	0.94 lbs (0.43 kg)
Description of product	Optical Data Link Module
Max. number of I/O points	2048 points
Communication Speed	1.25 Mbps
Communication Method	Half-duplex bit serial
Allowable momentary power failure time	1 within 20 ms
Synchronous method	Frame synchronous method
Transmission path method	Duplex loop method
Overall loop distance	Max. 10 km (32,810 ft) (between stations: 1 km (3,281 ft))
Number of connected stations	Max. 65 units/loop (1 master station and 64 local/remote I/O stations)
Demodulation method	CMI method
Transmission format	Conforms to HDLC (frame method)
RAS function	Loopback function, diagnostic function
Connector	2-conductor optical connector plug (CA9003)
Cable used	SL-200/250

The A3ACPUP21 is an optical data link module utilized in Mitsubishi's A Series. With a maximum I/O capacity of 2048 points, it ensures reliable communications at a speed of 1.25 Mbps. The module employs half-duplex bit serial communication and includes features for managing brief power interruptions.

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.