Allen-Bradley MicroLogix 1400 Instruction Manual page 27

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I/O Addressing
I/O addressing scheme
Format Explanation
Od:s.w/b X File Type
d Data File Number (optional)
Id:s.w/b
: Slot delimiter (optional, not required for Data Files 2...255)
s Slot number (decimal)
. Word delimiter. Required only if a word number is necessary as noted below.
w Word number
/ Bit delimiter
b Bit number
Addressing examples
Addressing Level
Example Address
Bit addressing (2)
O:0/4
(2)
O:2/7
(2)
I:1/4
I:0/15
Addressing Details
The I/O addressing scheme and examples are shown below.
File Type
Input (I) or Output (O)
(1) I/O located on the controller (embedded I/O) is slot 0.
I/O added to the controller (expansion I/O) begins with slot 1.
(1) Slot
Output slot 0 (embedded I/O)
Output slot 2 (expansion I/O)
Input slot 1 (expansion I/O)
(2) Input slot 0 (embedded I/O)
Data File Number Slot Number
Xd:s.w/b
Slot Delimiter Word Delimiter
Input (I) or Output (O)
0 = output, 1 = input
Embedded I/O: slot 0
Expansion I/O:
slots 1...7 for MicroLogix 1400 (See page 17 for an illustration.)
Required to read/write words, or if the discrete bit number is above 15.
Range: 0...255
0 to 15
Word
Word 0
Word 0
Word 0
Word 0
Publication 1766-RM001A-EN-P - October 2008
I/O Configuration
(1)
Word
Bit
Bit Delimiter
Bit
Output bit 4
Output bit 7
Input bit 4
Input bit 15
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