What It Is and Where It Fits
The Siemens 6ES7456-4EY00-0AE0 is an FM456-4 application module for the S7-400 programmable logic controller platform. It is a PLC expansion module that adds application-specific processing capability to an S7-400 rack. This module is classified as mature in its lifecycle, meaning it is no longer in active new-production but remains available through qualified sourcing channels for maintenance, spares, or legacy system support.