6 • Important CommentsSymbolsWAGO-I/O-SYSTEM 750I/O-Modules1.2 SymbolsDangerAlways abide by this information to protect persons from injury.WarningAlways abide by this information to prevent damage to the device.AttentionMarginal conditions must always be observed to ensure smooth operation.ESD (Electrostatic Discharge)Warning of damage to the components by electrostatic discharge. Observethe precautionary measure for handling components at risk.NoteRoutines or advice for efficient use of the device and software optimization.Additional InformationReferences on additional literature, manuals, data sheets and internet pages.1.3 Number NotationNumber Code Example NoteDecimal 100 normal notationHexadecimal 0x64 C notationBinary '100''0110.0100'within inverted commas,nibble separated with dots