Siemens simatic s7 200 add on modules siemens 6es7223 1ph22 0xa0 a digital io module from the simatic s7 200 modular range that features 8x digital inputs and 8x digital relay outputs load voltage is 24v dc and 24 to 230v ac siemens 6es7223 1ph22 0xa0 sps add on module em 223