Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 238)

ASCII Module
For PLCĆ3 Processor
Appendix B
B-16
I/O Adapter Status, Status file 2, S2:0
This file records I/O faults occuring in each I/O chassis in your
system. It identifies the location by rack number to within a
quarter I/O rack (32 I/O points or four module slots). The file
length is application dependent: one word for assigned rack
numbers 0-3, two words for 0-7, three words for 0-11 and so forth.
Each displayed bit represents a fault detected within the quarter
rack. The display format is:
Bit Number
17 Ć 13 12 Ć 10 07 Ć 04 03 Ć 00
rack 3
rack 7
:
rack 2
rack 6
:
rack 1
rack 5
:
rack 0
rack 4
:
For example, bit 00 indicates a fault at rack 0, first quarter chassis; bit
01 at rack 0, second quarter chassis, and so forth.
Adapter Re-try, Status file, 3, S3:0
This file counts the number of transmissions attempted between the
scanner and each I/O chassis in the system. The file records the
re-tries occurring in each quarter rack. Frequent re-tries indicate I/O
communication problems. The file length is application dependent,
four words per assigned rack number. The display format is:
Bit Number
Word Rack 17 Ć 13 12 Ć 10 07 Ć 04 03 Ć 00
0000
0001
0002
0003
0004
0005
:
0
0
0
0
1
1
:
binary count, first quarter rack
binary count, second quarterĆrack
binary count, third quarterĆrack
binary count, fourth quarterĆrack
binary count, first quarterĆrack
binary count, second quarterĆrack
:
A read (only) program for transferring data from your ASCII device
into the data table of your processor is presented with rung
descriptions in Figure A.18.
Example Read (Only) Program