请教下列两种数字量输入模块的区别及应用范围
6ES73217BH000AB0:
SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED, 16 DI, DC 24V, 20 PIN,PROCESS INTERRUPT, DIAGNOSTICS
6ES73217BH010AB0 :
SIMATIC S7-300, DIGITAL INPUT SM 321, GALVANICALLY ISOLATED, 16 DI, DC 24V, 20 PIN,PROCESS INTERRUPT, DIAGNOSTICS, FIT FOR ISOCHRONE MODE