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

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### 3.3.2.2 PLC-3 Extended Addressing

Extended addressing is an alternative form of addressing memory in the PLC-3. Only data table area addresses are supported (area 3).

Figure 3-9 shows the structure of legal extended addresses.

Table 3-12 shows example addresses and supported data types for the PLC-3.

Figure 3-9 PLC-3 Extended Address Format

Table 3-12 Example PLC-3 Extended Addresses
Example Address | MMS Type1 | Description
--- | --- | ---
E3.1.1.0.0.77 | INTEGER_16 | Word 77 octal of the output image (1) file
E3.1.9.0.0.30 | VISIBLE_STRING | Word 30 of ASCII (9) file 0
E3.1.10.8.99.0 | INTEGER_32 | Longword 99 of high-order integer (10) file 8
E3.1.4.0.99.2 | UNSIGNED_16 | Accumulated value of counter (4) 99
E3.1.8.8.0.183/16 | BIT_STRING | Bit 16 octal of word 183 of binary (8) file 8

1Support for data types and arrays follow the same rules as when using data table addressing. Structures are not supported.

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