Rockwell Automation 160-DN2 160-DN2 DeviceNet Communication Module FRN 3.xx - Manual (Page 74)

Publication 0160-5.18 - June 2003
6-36 Using 160-DN2 with DeviceNet Scanner
Using Explicit Messaging
(Continued) Important: To originate a scanner transaction, use a copy operation
to M0:[slot number]:224. Then, use a copy operation to read
M1:1.224 for the result. If more than one message is enabled, use the
TXID to determine which message you are reading.
Figure 6.25
SLC Example Explicit Messaging Ladder Logic Program
0000
B3:0
0
COP
#N20:10
#M0:1:224
32
U
B3 :0
0
Initiate
Explicit
Message
0001
I:1.0
15
1747-SDN
Explicit
Message
Response
Available
COP
Copy File
Source
#M1:1:224
Dest #N20:50
Length 32
Explicit
Message
Response
EQU
Equal
Source A
N20:10
257 <
Source B N20:50
257 <
MVM
Mask Move
Source
N20:0
4<
Mask 00FFh
255 <
Dest M0:1.224
?<
Explicit
Message
0002 END
Initiate
Explicit
Message
Explicit
Message
Copy File
Source
Dest
Length
When B3:0/0 is set to true, this rung will
copy the 32 words of Explicit Message from
the buffer at N20:10 to M0-File Explicit
Message buffer. The scanner will send the
message out over DeviceNet.
When I:1.0/15 is set to true and the Explicit
Message Response has been received in the M1-
File, this rung performs the following:
- Copies the response message into N10:50.
- Copies a command of four (4) into the M1-
File.The four (4) commands the 1747-SDN
scanner to discard the response data so that the
buffer can be used for the next message
response.