Specifications

Allen-Bradley ControlLogix Ethernet Driver Help
PLC Model Max. Word
MicroLogix 999
SLC 500 Fixed I/O 96
SLC 500 Modular I/O 999
PLC-5 Series 999
The maximum word location is one less when accessing as a 32-bit data type (such as Long, DWord, or Long
BCD).
Examples
Example Description
S:0 Word 0
S/26 Bit 26
S:4/15 Bit 15 word 4
S:10 [16] 16 element array starting at word 10
S:0 [4] [8] 4 by 8 element array starting at word 0
Binary Files
To access binary files, specify a file number, a word and optional bit in the word. The default data types are
shown in bold.
Syntax Data Type Access
B<file>:<word> Short, Word, BCD, DWord, Long, LBCD Read/Write
B<file>:<word> [rows][cols] Short, Word, BCD, DWord, Long, LBCD (array type) Read/Write
B<file>:<word> [cols] Short, Word, BCD, DWord, Long, LBCD (array type) Read/Write
B<file>:<word>/<bit> Boolean Read/Write
B<file>/bit Boolean Read/Write
The number of array elements (in bytes) cannot exceed the block request size specified. This means that array
size cannot exceed 16 words given a block request size of 32 bytes.
Ranges
PLC Model File Number Max. Word
MicroLogix 3, 9-999 999
SLC 500 Fixed I/O 3, 9-255 255
SLC 500 Modular I/O 3, 9-999 999
PLC-5 Series 3-999 1999
The maximum word location is one less when accessing as a 32-bit data type (such as Long, DWord, or Long
BCD).
Examples
Example Description
B3:0 Word 0
B3/26 Bit 26
B12:4/15 Bit 15 word 4
B3:10 [20] 20 element array starting at word 10
B15:0 [6] [6] 6 by 6 element array starting at word 0
Timer Files
Timer files are a structured type whose data is accessed by specifying a file number, an element and a field. The
default data types are shown in bold.
Syntax Data Type Access
T<file>:<element>.<field> Depends on field Depends on field
The following fields are allowed for each element. For the meaning of each field, refer to the PLC's documentation.
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