Siemens 6ES7321-1EL00-0AA0 is a SIMATIC S7-300 digital input module (SM 321) that provides 32 isolated digital inputs for AC signals, rated for 120 V AC, with galvanic isolation and a 1 × 40-pole backplane interface for mounting in an S7-300 rack. It expands a SIMATIC S7-300 controller’s input capacity to read sensors and switches in industrial automation and process control applications.
