6ES7331-7KB02-0AB0 模拟量输入模块(2路,多种信号)SIMATIC S7-300, ANALOG INPUTSM 331, OPTICALLY ISOLATED,2 AI, 9/12/14 BITS RESOLUTION,U/I/THERMOCOUPLE/RESISTANCE,INTERRUPT, DIAGNOSTICS,1 X 20 PIN,REMOVE/INSERT W. BACKPLANE BUS