Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 184)

ASCII Module
PLC-2 Family Processors
Appendix A
AĆ16
Figure A.6
Example Read (Only) Program
112
17
G
327
000
PUT
200
000
START
Loads zeros into command word one (CW1)
with switch, or first program scan
LADDER DIAGRAM DUMP
020
02
252
07
200
07
252
07
200
OFF 10
020
10
062
1.0
TON
PR 002
AC 000
062
15
020
OFF 10
U
200
15
252
15
035
00
252
15
200
15
035
00
252
15
200
ON 15
L
035 252 200
ON 15
U
00 15
SW1
SW1
Power-up initialization bit, reset
Energize on power-up to load initialization
power-up initialization bit CW1
words into write BT file
Energize timer on power-up
De-energize after time-out
(Initialization words sent)
Status word one (SW1) - Command Word one (CW1)
SW1-CW1 Read Handshake
read data available
EN
BLOCK XFER READ
DATA ADDR:
MODULE ADDR:
BLOCK LENGTH:
FILE: 050
371
14
252 - 267
DN
037
17
137
17
EN
BLOCK XFER WRITE
DATA ADDR:
MODULE ADDR:
BLOCK LENGTH:
FILE: 051
371
14
200 - 215
DN
037
16
137
16
Read SW1, SW2 and data (bar codes)
Write CW1, CW2 and
initialization words
L