Owner manual

SLC 500 Data Files and Logical Addressing B-3
Publication 1747-6.1
I/O addresses are assigned to fixed I/O controllers as shown below.
Format Explanation
O:e.s/b
I:e.s/b
O Output
I Input
: Element delimiter
e
Slot number
(decimal)
fixed I/O controller: 0
left slot of expansion rack: 1
right slot of expansion rack: 2
. Word delimiter.
Required only if a word number is
necessary as noted below.
s Word number
Required if the number of inputs or
outputs exceeds 16 for the slot. Range:
0-255 (range accomodates multi-word
specialty I/O modules).
/ Bit delimiter
b
Terminal
number
Inputs: 0 to 15 (or 0 to 23, slot 0)
Outputs:0to15
Examples:
O:0/4
O:2/7
I:1/4
I:0/15
I:0.1/17
Controller Output (slot 4)
Output 7, slot 2 of an expansion rack
Input 4, slot 1 of an expansion rack
Controller input 15 (slot 0)
Controller input 23 (bit 07, word 1 of slot 0)
Alternate way of addressing I/O terminals 16 and higher: As indicated above, address
I:0.1/7 applies to input terminal 23 of slot 0. You can also address this terminal asI:0/23
Word
Addresses
O:1
I:0
I:0.1
Output word 0, slot 1
Input word 0, slot 0
Input word 1, slot 0