it is bit variable, bool or ebool type.
Usually you need ebool variables, because you want change bits from panel/scada and not only via programming device (By the way you can set clock easier with programing computer at online (PLC rack viewer->PLC card -> double click -> animation. But if you want change it without prorammming device, you have to write little bit code)
For reading/writing bit example from panel variable need usually %M address and you can give %M address only to ebool type variables. For Integers you need %MW addresses and int type variables.
Usually you need ebool variables, because you want change bits from panel/scada and not only via programming device (By the way you can set clock easier with programing computer at online (PLC rack viewer->PLC card -> double click -> animation. But if you want change it without prorammming device, you have to write little bit code)
For reading/writing bit example from panel variable need usually %M address and you can give %M address only to ebool type variables. For Integers you need %MW addresses and int type variables.