Rockwell Automation GV3000/SE AC Drive ControlNet Network Communication Board, M/N 2CN3000 - Manual (Page 87)

Configuring SLC500 Applications 6-5
6.4 Scheduled Messaging (I/O)
To use scheduled messaging, the Ladder Logic must include a line that sets a bit in
the SCNR module. The processor must be in run or remote run. Include a line that has
a coil that sets word 0, bit 10 in the SCNR module. [O:x:0/10], where x = the slot
number where the SCNR module resides. Output word “0” is the SCNR command
word. Input word “0” is the SCNR status word.
In the example below:
• O:3.3 had been set up as the output address and I:3.3 had been set up as the input
address. There is a four (4) word offset in the discrete I/O Input. The drive
appears to the processor as an IO rack with several modules, causing the Input
offset.
• O:3.3 (Output register of the SCNR, word 3) shows the Word 0 - Drive Control Word.
It is set to 3, meaning bits 00 and 01 (Run and Stop Not) are asserted and the drive
is running. O:3.4 is Word 1 - Speed/Torque Reference. It shows the drive reference
at 50% full speed. O:3.5 is Word 2 - Field Reference. If a GV3000 is using a field
current regulator kit option, this parameter must be set high enough to prevent a
drive Field Loss Fault.
• I:3.7 is Word 0 - Drive Status Word (shown in decimal). Individual bits could be used
for programming information. I:3.8 is Word 1 - Speed Feedback, which closely
follows Output Speed Reference.
Figure 6.5 – Scheduled Messaging Example 1a