Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 80)

ASCII I/O Module Tutorial
Chapter 4
4Ć6
2. Demonstrate the string length by entering 16 data characters. When
you enter the 16th data character, the module transfers the string of
15 characters to the read block transfer file in the data table, where
you can observe it. (The sixteenth character is not transferred but
remains as the first character in the input buffer.) Do the following
example where the processor will read data from your ASCII
module. Refer to the procedures in section titled “Reading Data
from Your ASCII Device”, P. 1-28.
Enter ALLEN BRADLEY 12 (enter spaces as shown)
Procedure P1 Set your industrial terminal to alphanumeric mode
Procedure P2 Enter your data
Procedure P3 Set your industrial terminal to PLCĆ2 mode
Procedure P4 Observe how data is stored in the data table
Results The read block transfer file displays the 15 data characters in
positions 003 thru 010 (Table 3.B).
Table 3.B
String Length Display
Position File Data ASCII Equivalent
001 A010 or E010 status word one
002 0000 status word two
003 2041 A
004 4C4C LL
005 454E EN 15
006 2042 B transferred
007 5241 RA characters
008 444C DL
009 4559 EY
010 2031 I
The space (20) in position 003 was placed there by the module due to
right justification of data.