Specifications

Allen-Bradley ControlLogix Ethernet Driver Help
Array
Element
Byte, Char**
Word, Short,
BCD***
DWord,
Long, LBCD
Float****
The Controller tag must be an array.
Array
w/o
Offset
Boolean Array 1. Use this case to have the bits within an REAL in array form.
Note: This is not an array of REALs in Boolean notation.
2. Applies to bit-within-REAL only. Example: tag_1.0{32}.
3. .bit + array size cannot exceed 32 bits. Example: tag_1.1{32} exceeds
an REAL, tag_1.0{32} does not.
Array
w/o
Offset
Byte Array,
Char Array**
Word Array,
Short Array,
BCD Array***
DWord
Array, Long
Array, LBCD
Array
Float
Array****
If accessing more than a single element, the Controller tag must be an array.
Array w/
Offset
Byte Array,
Char Array**
Word Array,
Short Array,
BCD Array***
DWord
Array, Long
Array, LBCD
Array
Float
Array****
The Controller tag must be an array.
Bit Boolean 1. The range is limited from 0 to 31.
2. If the Controller tag is an array, the bit class reference must be prefixed
by an array element class reference. Example: tag_1 [2,2,3].0.
Note: Float is casted to a DWord to allow referencing of bits.
String String 1. If accessing a single element, the Controller tag need not be an array.
Note: The value of the string is the ASCII equivalent of the REAL value
(clamped to 255). Example: SINT = 65 dec = "A".
2. If accessing more than a single element, the Controller tag must be an
array. The value of the string is the null-terminated ASCII equivalent of all
the REALs (clamped to 255) in the string. 1 character in string = 1 REAL,
clamped to 255.
Note: REAL strings are not packed. For greater efficiency, use SINT
strings or the STRING structure instead.
*non-zero values are clamped to true.
**Values exceeding 255 are clamped to 255.
***Values exceeding 65535 are clamped to 65535.
****Float value is a valid IEEE single precision floating point number.
Examples
Examples highlighted in yellow signify common use cases.
REAL Controller Tag - realtag = 512.5 (decimal)
Server Tag
Format Data Type Notes
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