deer all i have s5 cpu (s5-95u) which have 16 integrated digetal inputs & 16 integrated digetal outputs : but i need to know what addreses i have to start weth becaus i do it like thes i0.0 -- i0.7 q2.0 -- q2.7 i1.0 -- i1.7 q3.0 -- q3.7 but i then got i stak eror duto wrong addresing so pleas what addres i can use & is thear away to chek them from cpu it self same in s7 when we go th hardweer confeguration and we chek the modul information?? best regardes Essam Banat