User Manual Chapter 13
GFK-1742F Jan 2020
Local Logic Variables 311
13.4 Local Logic User Data Table
Local Logic provides an 8192 Byte Circular Buffer which can be used to store and retrieve
data by the Local Logic program. Refer to Table 69 for a listing of the Data_Table variables.
The data table is accessed using indirect memory addressing. The Data_Table_Ptr variable
(the “Pointer”) is used to point to the correct Byte location in the 8192 Byte buffer.
Therefore, the Data_Table_Ptr variable size is 13 bits (0-8191 allowed range). The Pointer is
automatically incremented when a value is read from or written to the Circular Buffer. The
amount by which the pointer is incremented depends on the size of the variable accessed.
The Data_Table_Ptr is automatically initialized to 0 when Local Logic starts, before the first
execution sweep. Thus, the Data Table variables can be used to access a large pre-loaded
block of data in the Local Logic program. The following variables are used to access the
Circular Buffer:
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