Siemens siplus sb 1223 digital input output module siemens 6es7223 0bd30 0xb0 the siemens siplus 6es7223 0bd30 0xb0 sb 1223 is a digital input output module that converts the level of the external digital signals from the process into the internal signal level of the s7 1200 and the internal signal level of the s7 1200 into the external signal level required by the processthe signal board is plugged directly into the receptacle on the front of the s7 1200 cpu and connects electrically an