Allen-Bradley MicroLogix 1400 - IO Addressing

Publication 1766-RM001A-EN-P - October 2008
I/O Configuration 27
I/O Addressing
Addressing Details
The I/O addressing scheme and examples are shown below.
(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.
Xd:s.w/b
File Type
Input (I) or Output (O)
Data File Number
Slot Number
(1)
Word
Bit
Bit DelimiterWord DelimiterSlot Delimiter
I/O addressing scheme
Format Explanation
Od:s.w/b
Id:s.w/b
X File Type Input (I) or Output (O)
d Data File Number (optional) 0 = output, 1 = input
: Slot delimiter (optional, not required for Data Files 2…255)
s Slot number (decimal) Embedded I/O: slot 0
Expansion I/O:
slots 1…7 for MicroLogix 1400 (See page 17 for an illustration.)
. Word delimiter. Required only if a word number is necessary as noted below.
w Word number Required to read/write words, or if the discrete bit number is above 15.
Range: 0…255
/ Bit delimiter
b Bit number 0 to 15
Addressing examples
Addressing Level
Example Address
(1)
Slot Word Bit
Bit addressing
O:0/4
(2)
Output slot 0 (embedded I/O) Word 0 Output bit 4
O:2/7
(2)
Output slot 2 (expansion I/O) Word 0 Output bit 7
I:1/4
(2)
Input slot 1 (expansion I/O) Word 0 Input bit 4
I:0/15
(2)
Input slot 0 (embedded I/O) Word 0 Input bit 15
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