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

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Figure 3-43 shows the structure of a legal Timer, Counter, Control or ASCII String data table address for the SLC.

> Figure 3-44 shows a SLC Timer structure.
> Figure 3-45 shows a SLC Counter structure.
> Figure 3-46 shows a SLC Control structure.
> Figure 3-47 shows a SLC ASCII String structure.

Table 3-29 shows examples of legal Timer, Counter, Control and ASCII String table addresses for the SLC.

Figure 3-43 SLC Timer, Counter, Control and ASCII String Data Table Address Format

Note ASCII string is available only on SLC 5/03 Series C with OS301 and SLC 5/04 Series A with OS400.

Figure 3-44 SLC Timer Structure

Figure 3-45 SLC Counter Structure

Figure 3-46 SLC Control Structure

Figure 3-47 SLC ASCII String Structure

Table 3-29 Example SLC Timer, Counter, Control and ASCII String Data Table Address Formats
Example Address | MMS Type1 | Description
--- | --- | ---
$T20:0.ACC | UNSIGNED_16 | Timer 0 in file 20 accumulated value
C91:3.PRE | INTEGER_16 | Counter 91 in file 3 preset value
T:20.CTL/15 | BIT_STRING | Timer 20 in the default timer file (4) Enable bit 2
R6:0.UL | BIT_STRING | Control 0 in file 6 Unload bit 2
T4:20.TD | BIT_STRING | Timer 20 in file 4 Timer Done bit 2
R:1.LEN | INTEGER_16 | Control 1 in the default control file (6) Length value
ST16:0.LEN | INTEGER_16 | String 0 in file 16 Length value
ST16:2 | VISIBLE_STRING 3 | String 2 in file 16
ST16:3 | OCTET_STRING 3 | String 3 in file 16
T:5 | Structure 4 UNSIGNED_16 UNSIGNED_16 UNSIGNED_16 | All of timer 5 in file 4 Control Preset value Accumulated value
R8:10 | Structure 4 UNSIGNED_16 INTEGER_16 INTEGER_16 | All of control 10 in file 8 Control Length Position

1Arrays are not supported for structures other than ASCII strings.
2Control bits should be treated as read only and modified only under PLC program control. Modifying these bits from a computer can give unpredictable results.
3Only Varying length strings are supported.
4Write operations are not allowed to structures other than to ASCII strings.

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