140 • MODBUS FunctionsInternal VariablesWAGO-I/O-SYSTEM 750ETHERNET TCP/IPRegister Adresse 0x100BValue Save Watchdog ParameterAccess writeDefault 0x0000Description With writing of '1' in register 0x100Bthe registers 0x1000, 0x1001, 0x1002 are set on remanent.4.2.5.2 Diagnostic FunctionsThe following registers can be read to determine errors in the node:Register address 0x1020 (MODBUS Address 404129)Designation LedErrCodeAccess readDescription Declaration of the Error code (see section 3.1.8.4 for error code definitons)Register address 0x1021 (MODBUS Address 404130)Designation LedErrArgAccess readDescription Declaration of the Error argument (see section 3.1.8.4 for error codedefinitons)4.2.5.3 Configuration FunctionsThe following registers contain configuration information of the connectedmodules:Register address 0x1022 (MODBUS Address 404131)Designation CnfLen.AnalogOutAccess readDescription Number of word-based outputs registers in the process image in bits (divideby 16 to get the total number of analog words)Register address 0x1023 (MODBUS Address 404132)Designation CnfLen.AnalogInpAccess readDescription Number of word-based inputs registers in the process image in bits (divide by16 to get the total number of analog words)Register address 0x1024 (MODBUS Address 404133)Designation CnfLen.DigitalOutAccess readDescription Number of digital output bits in the process image
