Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 244)

ASCII Module
For PLCĆ3 Processor
Appendix B
B-22
WO005:0000
00
RUNG NUMBER RM13
RUNG NUMBER RM14
EOP
Initialization: Turns off rung 1 except for
1st scan at power-up
A read/write program that you can use to transfer data to and/or from
your ASCII device is presented with rung descriptions in
Figure B.11.
Figure B.11
Example Read/Write Program
00
WO005:0000
00
MOV
MOVE FROM A TO R
A : WO001:0000
0000000000000000
R : WO002:0000
0000000000000000
RUNG NUMBER RM0
Load zeros into command word 1 with
selector switch or on first scan
RUNG NUMBER RM1
WO003:0000
07
WO002:0000
07
Power-up/reset power-up initialization bit
WO003:0000
15
WO002:0000
15
WO003:0000
15
WO002:0000
15
WO005:0000
02
Status word 1 - Command word 1
read data available
RUNG NUMBER RM2
WO002:0000
15
WO005:0000
02
RUNG NUMBER RM3
WO003:0000
15
L
Status word 1 - Command word 1
read handshake
I
0001
Example Read/Write Program