Hello i'm new in Omron plc programming and not very good in english! I have write this code in ST language but have 1 error in compiling it. This is the code: PLC CJ2M Data Types Prova [struct] Members of Prova Dog Bool [10] array of ten boolean bit Presente Bool Symbols Prova [3] Array of 3 elements. I create a new program Max:=3; (uint) Max2:= 10; (uint) FOR i :=1 TO Max BY 1 DO; Prova.Presente := TRUE; FOR j:= 1 TO Max2 BY 1 DO; Prova.Dog[j]= Prova.Presente AND j<10; END_FOR; END_FOR; I get this error Matrix Index not valid. Need some help, maybe indirect addressing?