Siemens SIMATIC PLC 6AG1321-7BH01-4AS0 SIPLUS S7-300 SM321 16DE    0-1 LEVEL AT ABOUT 11.2V    WITH CONFORMAL COATING    BASED ON 6ES7321-7BH01-0AB0    .    DIGITAL INPUTSM 321, GALVANICALLY ISOLATED,    16 DI, DC 24V, 1 X 20 PIN,    PROCESS INTERRUPT, DIAGNOSTICS,    FIT FOR ISOCHRONE MODE 6AG13217BH014AS0