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

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## 3.3.5 SLC Addressing Syntax and Supported Data Types

This section describes legal data table addresses and data types for the 1747 SLC 500 family.

The structure of a legal data table address for the SLC differs depending on the table that is being addressed. The SLC supports the following data table sections:

> I - Input
> O - Output
> S - Status
> B - Binary
> T - Timer
> C - Counter
> R - Control
> N - Integer
> F - Floating-Point
> A - ASCII
> ST - String

Note ASCII, ASCII string and floating-point are available only on SLC 5/03 Series C with OS301 and SLC 5/04 Series A with OS400.

Figure 3-40 shows the structure of a legal I/O data table address for the SLC.

Table 3-26 shows examples of legal I/O data table addresses for the SLC.

Figure 3-40 SLC I/O Data Table Address Format

Note Reading and writing of I/O data table addresses is supported only for SLC-5/03 and SLC-5/04 processors.

Table 3-26 Example SLC I/O Data Table Addresses
Example Address | MMS Type1 | Description
--- | --- | ---
I:4 | UNSIGNED_16 | Input image I/O slot 4
I:5.1 | INTEGER_16 | Input image I/O slot 5 word 1
I:10.1/15 | BIT_STRING | Bit 31 of I/O slot 10
$O:8/1 | BIT_STRING | Bit 1 of I/O slot 8
I:0 | Array of 10 UNSIGNED_16 | Ten words beginning at I/O slot 0

1Arrays are supported. Structures are not supported. Variable size arrays are not supported.

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