Rockwell Automation 1329I DeviceNet Option FRN 1.XXX - Manual (Page 45)

Using Explicit Messaging 6-3
Example SLC Ladder Logic
Program The example ladder logic program ( Figure 6.2 ) can be used to do explicit
messaging from an SLC. This ladder program will allow the SLC 500 to use
explicit messaging to read and write parameters to a 1329I Integrated drive/
motor.
Running the Example Program
1. Enter data into the program.
The request information will be placed in the N10 file. The first word in
N10 will be the TXID and command information, which both receive a
value of one. The second word will be the port and size information. The
port value will be zero when using an SLC, and the size will be the
number of bytes for the class, instance, attribute, and service data. The
third word will contain the service and Node Address. The service will
be either a set (write) or a get (read) attribute. The value for a set is 0x10,
and the value for a get is 0x0E. The node address will be the node
address assigned to the slave device (1329I Integrated drive/motor).
Finally, the class, instance, and attribute for the parameter have to be
entered. These values can be found in
Appendix B and Appendix C .
2. Run the program.
After entering the request into the N10 file, the program needs to be
triggered to run. Triggering the program is done by changing the address
N7:0/0 from a zero to a one. The program will change the address back
to zero when the explicit message is complete.
3. Receive Data from the program.
After the program has been run, the results can be seen in the N11
address. The SLC program should read/copy the data before performing
another explicit message request. It is important to note that the
command byte in node N10:0/0 is changed when the program executes
and must be changed back to a one before the program can be run again.