Siemens logo 6 7 and 8 sps plc expansion modules siemens 6ed1055 1md00 0ba1 the siemens logo 6 7 am2 rtd expansion module extends the logo 6 and 7 programmable logic controllers with 2 x additional analogue inputs each input will accept a 2 or 3 wire pt100 or pt1000 temperature sensor siemens 6ed1055 1md00 0ba1 logo 6 7 sps plc expansion module am2 rtd