Siemens SIMATIC PLC 6AG1521-1FH00-7AA0 SIPLUS S7-1500,    DIGITAL INPUT MODULE    DI16 X AC230V,    16 CHANNELS IN GROUPS OF 4;    INPUT DELAY 20MS;    INPUT TYPE 1 (IEC 61131)    -40 ... +70 DEGREE C    WITH CONFORMAL COATING    BASED ON 6ES7521-1FH00-0AA0 6AG15211FH007AA0