SIMATIC S7-300, EXTEND MODULE (6ES73311KF020AB0) SM 331, OPTICALLY ISOLATED, 8 AI, 13 BIT RESOLUTION, U/I/RESISTANCE/PT100, NI100, NI1000, LG-NI1000, PTC / KTY, 66 MS MODULE UPDATE, 1 X 40 PIN AND SIMATIC S7-300, FRONT CONNECTOR (6ES73921BM010AA0) FOR SIGNAL MODULES WITH SPRING CONTACTS, 40-PIN