Chapter 1 Introduction b15 b0 b5 b10 X0 D0 Users can access the state of DX0.0 and that of DY0.0 in a program. The state of DX0.0 and that of DY0.0 are not limited by scan time. They are refreshed immediately in a program. 6. Supporting IEC 61131-3 The AH500 series CPU module supports IEC 61131-3. The programming languages which are supported are instruction lists (IL), structured texts (ST), ladder diagrams (LD), sequential function charts (SFC), and function block diagrams (FBD). 1-11 b15 b10 b5 b0