Siemens 6ES7621-1AD00-0AE3 Programmable Logic Controller Module

Siemens 6ES7621-1AD00-0AE3 is the C7-621 Compact Unit for the SIMATIC S7-300 family, delivering a single, integrated control solution that combines the S7-300 CPU, an integrated OP-C7 human–machine interface, and the IM 621 I/O block with built-in I/O for compact automation tasks. The enclosure measures 168 x 120 x 70 mm (H x W x D) and weighs about 1,350 g, powered from 24 V DC (20.4 to 30.2 V DC, SELV), with a front IP65 rating and IP20 housing to withstand industrial environments; it includes standard MPI communication and a P-bus interface for connecting to S7-300 modules, plus a 5 ms bus cycle time when supporting up to 31 slaves. The unit provides 128 KB of flash configuration memory, a 2-line STN LCD display (20 characters per line) with a 23-key keypad, and an integrated OP-C7/HMI component, enabling on-device monitoring and basic interaction without a separate panel. The IM 621 I/O block within this configuration delivers 16 digital inputs and 16 digital outputs, plus 4 analog inputs and 1 analog output, all accessible through the P-bus/MPI network for streamlined, space-efficient control in small-to-medium automation tasks. This specific 6ES7621-1AD00-0AE3 ordering number identifies the C7-621 Compact Unit without AS-i integration (the AS-i variant carries 6ES7621-6BD00-0AE3), offering a ready-to-run PLC solution with built-in HMI and substantial I/O capacity for compact, panel-mounted applications.