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

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Figure 3-32 shows the structure of a legal I/O data table address for the PLC-5/250.

Table 3-20 shows examples of legal I/O data table addresses for the PLC-5/250.

Figure 3-32 PLC-5 / 250 I/O Address Format

Table 3-20 Example PLC-5 / 250 I/O Addresses
Example Address | MMS Type1 | Description
--- | --- | ---
I:20 | UNSIGNED_16 | Input image rack 2 group 0 octal
I:277 | INTEGER_16 | Input image rack 27 group 7 octal
I:177/17 | BIT_STRING | Bit 17 of rack 17 group 7 octal
$O:77/1 | BIT_STRING | Bit 1 of rack 7 group 7 octal
I:0 | Array of 10 UNSIGNED_16 | Ten words beginning at rack 0 group 0

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

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