Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 160)

Chapter
7
7Ć1
Troubleshooting
In this chapter you will read about recognizing initialization errors,
interpreting status indicators, and status codes for troubleshooting
purposes. We will also show you how to conduct a test to verify that your
ASCII module is operating correctly.
If you should set bits of initialization words to an invalid range, the
module detects an initialization error and will not operate. Invalid settings
of initialization words are listed in Table 6.A.
Table 6.A
Initialization Errors
Feature Word (Bit) Invalid Setting or Range
Mode of module operation IW1(02Ć04) Above 001 (binary)
Mode of transmission IW1(05Ć07) Above 101 (binary)
String length IW2(00Ć13) Data mode:
above 62 characters
Either mode:
nonĆBCD digits using
AĆF hex
Data conversion IW2(14Ć16) Data mode:
above 100 (binary)
Report generation mode:
000=1 ASCII/word
011= 2 ASCII/word
100= 4 hex/word
above 100 (binary)
I/O buffer split IW3(00Ć02) Simplex read:
100=100% output
Simplex write:
001=100% input
Send EOS delimiter to PC IW3(04) Set in data mode
Chapter Objectives
Recognizing Initialization Errors