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Historic Tag |
B1 |
Slave's ID address |
B2 |
Function code linked to Read 70, defined on this Driver's properties dialog box |
B3 |
Table number |
B4 |
Table's record number |
Use the reading of a Block Tag to receive a list of history data stored in a device. Historic data is returned according to the following structure of Block Tag Elements:
•Element 1: First record item on the table
•Element 2: Second record item on the table
•Element 3: Third record item on the table
•Element n: Nth-record item on the table
To start collecting multiple records from the initial record defined by the B4 parameter, use the Historic Parameters Tag.
NOTE |
•When starting this Driver for the first time, the history collecting does not perform any reading until users trigger the first writing with the Historic Parameters Tag. •Use a Block Tag's OnRead event to collect each of the Historic records returned as a list. The timestamp of Historic records is linked to that Block Tag's timestamp. •The number of records successfully collected can be monitored by reading the Historic Collecting Query Tag. |