SM322 EXTEND MODULE (6ES73221HF010AA0) SIMATIC S7-300, DIGITAL OUTPUT SM 322, OPTICALLY ISOLATED, 8 DO (RELAY), 1 X 20 PIN, 24V DC, 2A OR 230V AC, 2A AND SIMATIC S7-300, FRONT CONNECTOR(6ES73921AJ000AA0) FOR SIGNAL MODULES WITH SCREW CONTACTS, 20-PIN