SM322 EXTEND MODULE (6ES73221BL000AA0) SIMATIC S7-300, DIGITAL OUTPUT SM 322, OPTICALLY ISOLATED, 32DO, 24V DC, 0.5A, 1 X 40 PIN, SUM OF OUTPUT CURRENTS 4A/GROUP (16A/MODULE) AND SIMATIC S7-300, FRONT CONNECTOR (6ES73921BM010AA0) FOR SIGNAL MODULES WITH SPRING CONTACTS, 40-PIN