How do I write to A-B PLC through 1761-NET-DNI?

Thanks, Emilie, for your previous response. I guessed that was the case, but as I'm new to DeviceNet, I was unsure.
I am still having problems communicating with the Allen-Bradley PLC, and am not sure whether the problem is with my LabVIEW code or configuring my DNI. I have attached a sample of the program I'm using to send a message to my PLC. Do I have the correct idea regarding how to send messages to the DNI network through my NI-DNET card? I set up the DNI so that the I/O page is in the Bit register file, and have programmed the PLC to turn an output light on if a certain bit in that section of the register file is logic-1. I use my LabVIEW program to send a message to that bit, but the light does not go on. Are there any obvious problems with my LabVIEW code? Thanks.
Mark Leusink

Hi Mark,
I took a look at your code, and for the most part, it looks very
good. There are only two things that I can see that may be
causing some issues. The first and most obvious is that you are
not using your error inputs and outputs at all. If you take a
look at any example program, the pink error cluster is wired through
all the VIs. This is always good practice, because the error
message returned from these VIs usually can point us in the right
direction of getting the error solved. If you do not wire this
through, the error may be lost completely. There may even be an
error message occurring in this program that we are not seeing that
could help us figure out why your device is not responding.
The other point of interest that I saw was in the inputs to the Convert
for DeviceNet Write.vi. The DNetDataIn input is left blank, which
is fine, except that you also have a byte offset of 1 as an
input. DNet Data is in an array format, and this VI will take
other data and convert it into DNet data, placing it in the data array
wherever you specify in the byte offset. Since you have nothing
wired into the DNetDataIn, then it starts with an array of all
0's. The byte offset is 1, so it skips over the first byte (at
index 0) and then places your data starting at byte index 1. This
may be the way your device is expecting the data, but if you want that
data to be at the front of the data array, then you need to wire a 0
into the byte offset. Otherwise, the data being sent out starts
with 0's.
Hope this helps!
john m
Applications Engineer

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