ERROR (ENUM) ¶ TYPE ERROR : This data structure describes errors which might occur when using the functions of the CAA_RealTimeClock library. Attributes: qualified_only InOut: Name Initial Comment NO_ERROR 0 No Error; function successfully executed FIRST_ERROR 5700 First library-specific error TIME_OUT 5701 Time limit exceeded NOT_AVAILABLE 5702 Not available TIME_NOT_VALID 5703 Invalid time values WRONG_PARAMETER 5704 Wrong parameter ERROR_UNKNOWN 5705 Unknown error NOT_IMPLEMENTED 5706 FIRST_MF 5725 First manufacturer-specific error LAST_ERROR 5749 Last library-specific error

PERIODE (ENUM) ¶ TYPE PERIODE : Attributes: qualified_only InOut: Name Initial UNKNOWN 0 STANDARD 1 DAYLIGHT 2

WEEKDAY (ENUM) ¶ TYPE WEEKDAY : Attributes: qualified_only InOut: Name Initial SUNDAY 0 MONDAY 1 TUESDAY 2 WEDNESDAY 3 THURSDAY 4 FRIDAY 5 SATURDAY 6

Function Blocks ¶ Time Zone Information GetTimeZoneInformation (FunctionBlock) SetTimeZoneInformation (FunctionBlock) Time and Date GetDateAndTime (FunctionBlock) SetDateAndTime (FunctionBlock)

Time Zone Information ¶ The World is divided in time zones which are based on the degrees of longitude. The English town Greenwich is situated in their centre on the so-called prime meridian that defines the starting point for the count of the world’s degrees of longitude. By taking a closer look at a globe, one can distinguish the degrees of longitude and latitude which clasp the world like a grid. The degrees of longitude go from north to south and connect the two poles. The time being measured in the observatory in Greenwich is called GMT which is the abbreviation for Greenwich Mean Time . The GMT serves as a basis for calculating the respecting times in all countries of the world. However nowadays the term GMT is not used any more as it has been replaced by the expression Universal Time Coordinated (UTC). [CC BY-SA 4.0 ( Wikimedia Commons )] GetTimeZoneInformation (FunctionBlock) SetTimeZoneInformation (FunctionBlock)

GetTimeZoneInformation (FB) ¶ FUNCTION_BLOCK GetTimeZoneInformation This function block reads the specific information on the time zone. InOut: Scope Name Type Comment Input xExecute BOOL Rising edge: Action start Falling edge: Resets outputs. If a falling edge occurs before the function block has completed its action, the outputs operate in the usual manner and are only reset if either the action is completed or in the event of an error. In this case, the corresponding output values (xDone, xError, iError) are present at the outputs for exactly one cycle. Output xDone BOOL Action successfully completed xBusy BOOL Function block active xError BOOL TRUE : error occurred, function block aborts action FALSE : no error eError ERROR Error description for diagnosis tziInfo RTCLK_TIME_ZONE_INFO Information on the time zone

SetTimeZoneInformation (FB) ¶ FUNCTION_BLOCK SetTimeZoneInformation With this function block the specific information of the time zone can be modified. The time zone setting will be kept even after a Reset-Origin of the controller and can only be modified by being overwritten again. If no automatic switch is desired, all elements of tziInfo.stStandardDate and tziInfo.stDaylightDate must be set to 0. InOut: Scope Name Type Comment Input xExecute BOOL Rising edge: Action start Falling edge: Resets outputs. If a falling edge occurs before the function block has completed its action, the outputs operate in the usual manner and are only reset if either the action is completed or in the event of an error. In this case, the corresponding output values (xDone, xError, iError) are present at the outputs for exactly one cycle. tziInfo RTCLK_TIME_ZONE_INFO Information on the time zone Output xDone BOOL Action successfully completed xBusy BOOL Function block active xError BOOL TRUE : error occurred, function block aborts action FALSE : no error eError ERROR Error description for diagnosis

Time and Date ¶ Modules of this library support reading and setting of the realtime clock. These modules, however, might not take into account the time zone and a possible switch between summer and standard time. If an automatic switch is desired all the same, the function blocks of the CAA_DTUtility library can be used for reading and setting the realtime clock. In this case the time switch is done via the CAA_DTUtility library . If the runtime system supports the automatic switch between summer and standard time, the calls of the library will be forwarded directly to the corresponding functions of library CAA_RealTimeClock and the clock switch will be done by the runtime system. GetDateAndTime (FunctionBlock) SetDateAndTime (FunctionBlock)

GetDateAndTime (FB) ¶ FUNCTION_BLOCK GetDateAndTime This function block reads the realtime clock. It returns the time of the local time zone (i.e. a possible switch to summer/standard time will be regarded). The current time zone switch can be defined by SetTimeZoneInformation . If a switch to summer/standard time has become necessary since the last polling of the time, this is done automatically. At the start of the module the outputs dtDateAndTime and eTimezone are reset. ( DT#1970-01-01-00:00 and RTCLK_UNKNOWN ). After successful operation they will contain the current local time. InOut: Scope Name Type Comment Input xExecute BOOL Rising edge: Action start Falling edge: Resets outputs. If a falling edge occurs before the function block has completed its Action, the outputs operate in the usual manner and are only reset if either the action is completed or in the event of an error. In this case, the corresponding output values (xDone, xError, iError) are present at the outputs for exactly one cycle. Output xDone BOOL Action successfully completed xBusy BOOL Function block active xError BOOL TRUE : error occurred, function block aborts action FALSE : no error eError ERROR Error description for diagnosis dtDateAndTime DT Current local time eTimezone PERIODE Current time zone

SetDateAndTime (FB) ¶ FUNCTION_BLOCK SetDateAndTime This function block sets the realtime clock. The current local time is passed in the parameter dtDateAndTime . Speciality: If the time is within the not-unique interval shortly after the switch to standard (winter) time, standard time will be assumed. This case occurs for example in the Central European countries, if on the last Sunday of October the time is set at 2:30 a.m.. Here it is not clear, whether 2:30 a.m. is still summer time or already standard (winter) time. In this case the module assumes standard (winter) time. InOut: Scope Name Type Comment Input xExecute BOOL Rising edge: Action start Falling edge: Resets outputs. If a falling edge occurs before the function block has completed its action, the outputs operate in the usual manner and are only reset if either the action is completed or in the event of an error. In this case, the corresponding output values (xDone, xError, iError) are present at the outputs for exactly one cycle. dtDateAndTime DT Current time Output xDone BOOL Action successfully completed xBusy BOOL Function block active xError BOOL TRUE : error occurred, function block aborts action FALSE : no error eError ERROR Error description for diagnosis