# BASEstartm Open DAS
for Allen-Bradley Data Highwaytm
on Tru64tm UNIX
Installation and User's Guide

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Figure 3-7 shows the structure of a legal Pointer data table address for the PLC-3. Figure 3-8 shows a PLC-3 Pointer structure.

Table 3-11 shows examples of legal Pointer data table addresses for the PLC-3.

Figure 3-7 PLC-3 Pointer Data Table Address Format

Figure 3-8 PLC-3 Pointer Structure

Table 3-11 Example PLC-3 Pointer Data Table Addresses
Example Address | MMS Type1 | Description
--- | --- | ---
$PFIL:91 | INTEGER_16T | Pointer 91 file number
PSEC:20 | UNSIGNED_16 | Pointer 20 section number
P4 | Structure 2 UNSIGNED_16 UNSIGNED_16 UNSIGNED_16 | All of pointer 4 Section File Word

1Writes are not allowed to the pointer file. Arrays are not supported.
2Fields in the structure can be any combination of three INTEGER_16 or UNSIGNED_16. The section, file and word values are read in that order.

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