110 • MODBUS FunctionsMODBUS Register MappingWAGO-I/O-SYSTEM 750ETHERNET TCP/IP4.2.4 MODBUS Register MappingThe following tables display the MODBUS addressing and the correspondingIEC61131 addressing for the process image and the internal variables isrepresented.Via the register services the states of the complex and digital I/O modules canbe determined or changed.Register (Word) Access Reading (with FC3 and FC4):Modbus-Address IEC61131[dec] [hex] Address Memory Range0... 2550x0000... 0x00FF%IW0... %IW255Physical Input Area256... 5110x0100... 0x01FF- Modbus Exception:“Illegal data address”512... 7670x0200... 0x02FF%QW0... %QW255Physical Output Area768... 40950x0300... 0x0FFF- Modbus Exception:“Illegal data address”4096... 122870x1000... 0x2FFF- Configuration Register(see following Chapter 4.2.5.3 ConfigurationFunctions)12288... 655350x3000... 0xFFFF- Modbus Exception:“Illegal data address”Register (Word) Access Writing (with FC6 and FC16):Modbus-Address IEC61131[dec] [hex] Address Memory Range0... 2550x0000... 0x00FF%QW0... %QW255Physical Output Area256... 5110x0100... 0x01FF- Modbus Exception:“Illegal data address”512... 7670x0200... 0x02FF%QW0... %QW255Physical Output Area768... 40950x0300... 0x0FFF- Modbus Exception:“Illegal data address”4096... 122870x1000... 0x2FFF- Configuration Register(see following Chapter 4.2.5.3 ConfigurationFunctions)12288... 655350x3000... 0xFFFF- Modbus Exception:“Illegal data address”The digital Modbus services (coil services) are Bit accesses, with which onlythe states of digital I/O modules can be determined or changed. Complex I/Omodules are not attainable with these services and so they are ignored.
