FB_BACnet_TrendLog_EX

Application

The function block FB_BACnet_TrendLog_EX can be used for read access to a BACnet object of type TrendLog.

VAR_OUPUT

bReady                   : BOOL;
bLogEnable               : BOOL;
nRecordCount             : UDINT;
nTotalCount              : UDINT;
eEventState              : E_BACNETEVENTSTATE;
bAckedTrans_ToOffNormal  : BOOL;
bAckedTrans_ToFault      : BOOL;
bAckedTrans_ToNormal     : BOOL;
tObjectID                : DINT:=-1;
bError                   : BOOL;
nErrorId                 : UINT;

bReady: Notification of general readiness. If this output is set, the other status outputs are valid (PresentValue, Overridden ...). If the output is FALSE, the corresponding function block FB_BACnet_Device does not report "Operational", or the block instance was not linked correctly in the TwinCAT System Manager.

bLogEnable: Logging of values is enabled. See BACnet specification DIN EN ISO 16484-5 for BACnet object TrendLog and property Log_Enable.

nRecordCount: Number of entries of the property Log_Buffer. If "0" is written to the property Record_Count, the Log_Buffer is reset. See BACnet specification DIN EN ISO 16484-5 for BACnet object TrendLog and property Record_Count.

nTotalCount: Total number of entries of the property Log_Buffer. See BACnet specification DIN EN ISO 16484-5 for BACnet object TrendLog and property Total_Record_Count.

eEventState: E_BACNETEVENTSTATE, see BACnet specification DIN EN ISO 16484-5 for BACnet object TrendLog and property Event_State.

bAckedTrans_ToOffNormal, bAckedTrans_ToFault, bAckedTrans_ToNormal: Flags of property Acked_Transitions (see BACnet specification DIN EN ISO 16484-5 for BACnet object TrendLog and property Acked_Transitions).

tObjectID: Object ID of the BACnet object (object type and object instance).

bError: An error is pending.

nErrorId: see global constants BACnet_Globals.

VAR_IN_OUT

Device               : FB_BACnet_Device;

Device: Specification of the instance of the local corresponding BACnet server block. For each BACnet adapter one BACnet server is possible. See FB_BACnet_Adapter and FB_BACnet_Device for further information.