4 • Important NotesSymbolsWAGO-I/O-SYSTEM 750ETHERNET TCP/IP• Please observe the safety measures against electrostatic dischargeaccording to DIN EN 61340-5-1/-3. When handling the modules, ensurethat the environment (persons, workplace and packing) is well grounded.• The relevant valid and applicable standards and guidelines concerning theinstallation of switch cabinets are to be observed.1.3 SymbolsDangerAlways observe this information to protect persons from injury.WarningAlways observe this information to prevent damage to the device.AttentionMarginal conditions that must always be observed to ensure smooth andefficient operation.ESD (Electrostatic Discharge)Warning of damage to the components through electrostatic discharge.Observe the precautionary measure for handling components at risk ofelectrostatic discharge.NoteMake important notes that are to be complied with so that a trouble-free andefficient device operation can be guaranteed.Additional InformationReferences to additional literature, manuals, data sheets and INTERNETpages.