Rockwell Automation 1203-GK5 DeviceNet Communications Module FRN 1.xxx-3.xxx - Manual (Page 74)

6-6 Using DeviceNet Explicit Messages
Examples The following examples show messages used with the ladder logic
programs begun in Chapter 5, Creating a Ladder Logic Program.
PLC Messaging
Figure 6.3, started in Chapter 5, Creating a Ladder Logic Program,
shows an example PLC ladder logic program that sends an explicit
message. The message sent is contained in N30, beginning at word 0.
The response data will appear in N30 starting at word 70.
Figure 6.3
PLC Messaging Example
!
ATTENTION: The example ladder logic program
shown in this manual is intended solely for purpose of
example. Because there are many variables and
requirements associated with any particular installation,
Rockwell Automation does not assume responsibility or
liability (to include intellectual property liability) for
actual use based upon the example shown in this
publication.
0000
I:000
17
ONS
B3:0
0
EN
DN
ER
BTW
Block Transfer Write
Module Type 1771-SDN DeviceNet Scanner Module
Rack
000
Group 0
Module 0
Control Block BT20:2
Data File N30:0
Length 64
Continuous No
BTW
MOV
Move
Source
0
0<
Dest N30:70
257<
MOV
0001
BT20:2
DN
CMP
Comparison
Expression N30:70 <> N30:0
CMP BT20:3
EN
EN
DN
ER
BTR
Block Transfer Read
Module Type 1771-SDN DeviceNet Scanner Module
Rack
000
Group 0
Module 0
Control Block BT20:3
Data File N30:70
Length 64
Continuous No
BTR
0002 END