Siemens SINUMERIK 828D Commissioning Manual page 877

Data format/symbolic identifier
DBX2.1 Error_1 BOOL Bit OFF OFF PLC → HMI
DBB3 DeviceId_1 BYTE Unsigned 0 0
Easy XML
Programming Manual, 10/2015, 6FC5397-3DP40-5BA3
Generating commissioning dialogs
2.2 Configuration in the PLC user program
Meaning
Device has an error
Unique device number
125