Mitsubishi A1SX42-S2 — DC Digital Input Unit

Part number	A1SX42-S2
Brand	Mitsubishi
Description	DC Digital Input Unit
Manufacturer	Mitsubishi
Product Type	DC digital input unit
Product Line	A Series
Part Number	A1SX42-S2
Weight	0.94 lbs (0.43 kg)
Series	MELSEC-A (AnS)
Main function	I/O unit
Design	FCN
Digital inputs	64 digital inputs (24V DC)
Type of Input	Sink
Isolation method	Photocoupler
Rated input voltage	24 VDC
Rated input current	5 mA (milliamps)
Operating voltage range	19.2 to 26.4 VDC (ripple: less than 5%)
Maximum number of input points	16 points/common) simultaneously ON (at 24VDC)
ON voltage/ON current	17.5 VDC or higher/3.5 mA or higher
OFF voltage/OFF current	7 VDC or lower/ 1.7mA or lower
Input resistance	Approx. 4.7 kilo-ohm

Mitsubishi Electric manufactured the A1SX42-S2 is a DC input module having 64 input points with photocoupler isolation, a 24VDC input voltage, and 5 amps input current rating. It has an operational voltage range of 19.2 to 26.4VDC and can run with 50% of its inputs turned on at the same time at 24VDC. The module has a response time of 10 milliseconds or less, a 32-point common terminal...

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.