BASEstartm Classic DAS
for Allen-Bradley
INTERCHANGEtm Software
Installation and User's Guide


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3.3 Supported Data Types

The following data types are supported by the DAS for AB INTERCHANGE software:

3.3.1 Structured Data

Not all available data formats will work in a format of STRUCTURE. Table 3-13 lists the supported formats for structured data. See Section 3.3.2 for more restrictions on data formats.

Table 3-13 Data Formats Supported for Structured Data
Format Restrictions
BIT When writing, the use of the BIT or BOOLEAN format in structures must be in contiguous multiples of eight (8). The length of the structure containing a bit field must be an even number of target elements.
ARRAY[n]:BIT When writing, the array size must be a multiple of 16 for PLC-5, PLC-3, PLC-2 and SLC family devices. The array size must be less than or equal to 16 for the PLC-5/250.
S_BYTE The size must be an even multiple of 2 bytes or characters.
U_BYTE The size must be an even multiple of 2 bytes or characters.
U_WORD  
S_WORD  
U_LONGWORD  
S_LONGWORD  
F_FLOAT  
STRING:n The size must be an even multiple of 2 bytes or characters.
ARRAY[n]: The size of the array must be an even multiple of the target PLC data type. For example: ARRAY[3]:S_WORD for a Longword target would not be valid. The forth word would have to be padded out by making the array size 4 or adding other members to a structure.

3.3.2 Restrictions to Data Formats

This section describes restrictions and limitations to data format usage.


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