What it is and where it fits
The CRT1B-MD04JS is an I/O module from Omron's CRT1B series, giving you 2 digital inputs and 2 solid-state outputs in a chassis-mount package. It's built for the CJ, CS, and NJ series controllers, making it a straight-line module for Omron-centric control panels. Rated IP20 and -10°C to 55°C operating range — fine inside a clean cabinet, no outdoor or washdown zone.
Sourcing reality
Active part, no phase-out or obsolescence flags. Quote-to-order channel — drop the CRT1B-MD04JS into your BOM and we'll confirm availability and lead time on an RFQ. No surplus or broker hunt needed.