Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 188)

ASCII Module
PLC-2 Family Processors
Appendix A
AĆ20
Figure A.8
Example Read/Write 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
020
OFF 10
020
10
062
1.0
TON
PR 002
AC 000
062
15
020
OFF 10
U
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)
200
15
252
15
035
00
252 200
Status word one (SW1) - Command word one (CW1)
read data available
020
01
252
16
200
ON 16
L
020 252 200
ON 16
U
01 16
112
16
020
00
020
01
020
01
020
00
L
112
16
020
00
U
One-shot for Write BT
035
00
252
15
200
ON 15
L
035 252 200
ON 15
U
00 15
SW1-CW1 Read Handshake
15 15
L
SW1-CW1 Write Handshake