Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 48)

Data Highway Communication
Chapter 3
3Ć3
To enter a message instruction, complete the steps below:
1. Enter a condition that, when true, will activate the message
instruction. In Figure 3.1, we used an examine–on for input word
0012
8
, bit 01.
Figure 3.1
Levels of Programming in Data Highway Communication
STAT
MSG
MESSAGE TYPE 1 STAT
10012
01
STAT
CTL = FB200:0000=200
CHANNEL: E2.5.1
EN
12
DN
15
ER
13
2) 1775–KA Module
@PROC_A
Data Highway Message Procedure
PROC_A
#H024$B12:37 = 15
Message procedure command
to transmit a message to data
highway station number 24
Message instruction to
execute message procedure
PROC_A
1) PLC–3 Processor
Ladder Diagram Program
3) Data Highway
DLE STX DST SRC CMD STS TNSW ADDR SIZE
DATA
DLE EXT BCC
(OPTIONAL)
Command message
transmitted to
station 24
10014–I