Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE User Manual
Page 121
ASCII I/O Module Tutorial
Chapter 4
4Ć47
RADIX = %H START = WO007:0000
WORD #
00000
0
0000
1
0000
2
0007
3
2021
4
0D00
5
2F00
2. Enter: PRODUCED/0000/PARTS[ENTER]
Refer to the procedures in section titled “Reading Data From Your ASCII
Device” (P. 1-28).
Procedure P1 Connect the 1770ĆCB cable, and set your industrial
terminal to alphanumeric mode (check parameters)
Initialize the module by changing PLCĆ3 operation mode
3[ENTER]2[ENTER]
Procedure P2 Enter your data
Procedure P3 Connect the 1775ĆCAT cable, and set your industrial
terminal to PLCĆ3 mode
Procedure P4 Observe how the data string is stored in data table file O6:0
Display Your 21 character message is stored in file O6:0. You can
display it in ASCII or in hex as follows:
RADIX = %A START = WO006:0000
WORD #
00000
0
00H00H
1
00H00H
2
P R
3
O D
4
U C
5
E D
6
/
7
00H00H
00010
/ P A R T S 00H 00H00H 00H00H 00H00H 00H00H
RADIX = %H START = WO006:0000
WORD #
00000
0
0000
1
0000
2
5052
3
4F44
4
5543
5
4544
6
202F
7
0000
00010
2F20
5041
5254
5300
0000
0000
0000
0000
Store the delimiter preceding the BCD value in the lower byte of the word
preceding the BCD storage word. Store the delimiter following the BCD
value in the upper byte of the word following the BCD storage word.
This is shown above. If necessary, add an extra space before the first
delimiter to properly position it.
3. Identify the storage word in the message file into which your
program will move the message variable (accumulated value). In
this example, it is display word 7.
4. Add program logic that moves your message variable into the proper
storage word in your message file, and moves your message file into
the write block transfer file (Figure 3.9). Add these rungs to the end
of your program.