Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 209)

ASCII Module
PLC-2 Family Processors
Appendix A
AĆ41
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 - 13 12 - 10 07 - 04 03 - 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 - 13 12 - 10 07 - 04 03 - 00
0000
0001
0002
0003
0004
0005
:
0
0
0
0
1
1
:
binary count, first quarter rack
binary count, second quarter-rack
binary count, third quarter-rack
binary count, fourth quarter-rack
binary count, first quarter-rack
binary count, second quarter-rack
:
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