Rockwell Automation 2100-GK61 DeviceNet to SCANport - Manual (Page 111)

Publication 2100-UM001B-EN-P – January 2001
Using DeviceNet Explicit Messaging 6-19
SLC Ladder Example SLC Messaging
Figure 6.10 shows an example message in the SLC ladder logic
program started in Chapter 5, Ladder Logic Programming—Including
Reading Inputs.
Figure 6.10
SLC Messaging Example
Important: To originate a scanner transaction, you must use a copy
operation to M0:[slot number]:224. Then, use a copy operation to
read M1:1.224 for the results. If you have more than one message
enabled, you will have to use the TXID to determine which message
you are reading.
LAD 4 - MESSAGING --- Total Rungs in File = 3
When B3:0/0 is set true, this rung will copy the 32 words of the Explicit Message from the buffer at N20:10 to the M0-File Explicit
Message buffer.
The 1747-SDN will send the message out over DeviceNet.
0000
B3:0
0
Initiate
Explicit
Message
COP
Copy File
Source
#N20:10
Dest #M0:1.224
Length 32
COP
Explicit
Message
U
B3:0
0
Initiate
Explicit
Message
When I:1.0/15 is true, and the Explicit Message response has been received and is in the M1-File, this rung:
1) Copies the response message into N10:50
2) Copies a command byte of 4 into the M1-File (commands the 1747-SDN scanner to discard the response data so
that the buffer can be used for the next available response message)
0001
I:1.0
15
1747-SDN
Explicit
Message
Response
Available
COP
Copy File
Source
#M1:1.224
Dest #N20:50
Length 32
COP
Explicit
Message
Response
EQU
Equal
Source A
N20:10
257<
Source B
N20:50
257<
EQU MVM
Masked Move
Source
N20:0
4<
Mask
00FFh
255<
Dest
M0:1.224
?<
MVM
Explicit
Message
0002 END