Specifications

Allen-Bradley ControlLogix Ethernet Driver Help
Output Word Offset for slot x = # Output Words in slot 0 through slot (x-1).
Note 1: The Embedded I/O needs to be taken into account when offsetting to Expansion I/O.
Note 2: The number of Input words does not factor into the calculation for Output Word Offset.
I/O Example
Let
Slot 0 = MicroLogix 1500 LRP Series C = 4 Output Words
Slot 1 = 1769-OF2 = 2 Output Words
Slot 2 = 1769-OW8 = 1 Output Word
Slot 3 = 1769-IA16 = 0 Output Word
Slot 4 = 1769-OF8V = 9 Output Word
Bit 5 of Slot 4 = 4 + 2 + 1 = 7 words = O:7/5
SLC 500 Syntax
The default data types are shown in bold.
Syntax Data Type Access
O:<slot> Short, Word, BCD Read Only
O:<slot>.<word> Short, Word, BCD Read Only
O:<slot>/<bit> Boolean Read Only
O:<slot>.<word>/<bit> Boolean Read Only
Ranges
PLC Model Min. Slot Max. Slot Max. Word
MicroLogix NA NA 2047
SLC 500 Fixed I/O NA NA 1
SLC 500 Modular I/O 1 30 *
PLC-5 Series NA NA 277 (octal)
*The number of Input or Output words available for each I/O module can be found in the SLC 500 Modular I/O
Selection Guide. For slot configuration help, refer to Device Setup.
Examples
MicroLogix Description
O:0 word 0
O/2 bit 2
O:0/5 bit 5
SLC 500 Fixed I/O Description
O:0 word 0
O:1 word 1
O/16 bit 16
O:1/0 bit 0 word 1 (same as O/16)
PLC5* Description
O:0 word 0
O:37 word 31 (37 octal = 31 decimal)
O/42 bit 34 (42 octal = 34 decimal)
O:2/2 bit 2 word 2 (same as O/42)
*Addresses are in Octal.
SLC 500 Modular I/O Description
O:1 word 0 slot 1
O:1.0 word 0 slot 1 (same as O:1)
O:12 word 0 slot 12
O:12.2 word 2 slot 12
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