Automationdirect P3000 Modbus Communication Lookout 6.5 for +/- 10V Output Module

Here is an iquiry I sent to Automationdirect tech support last week.
I have not had a response from them yet so I thought I would throw it up here.
Hello,
I am starting a new project with the P3K and I am using Lookout 6.5.
This is my fourth installation with this combination and I have learned a bit more about the Modbus communication each time.
I use the Modbus serial object in Lookout to communicate via RS-232.
With my first project, I learned to set the "Modbus Server Settings" in the P3000 software to map to a single 16 bit Modbus register to get the communications working with Lookout and making sense with the analog registers.
For a 10V input I would linear scale in the PAC 0 to 65535 = 0 to 10000 then in Lookout I simply divide by 1000 to get the decimal in the right place.
On the most recent project, I discovered I could map/scale my analog inputs to 32 bit foats, select the "map to two consecutive integers" in the P300 software properties and then in Lookout, I could read the register properly with an "F"
like "modbus1.F400001".
Now I have a P3-16DA-2, ±10V output module.
I can't get the float to work and it crashes the communication repetitively.
It will communicate properly if I stick to 16 bit Modbus register for the "Analog Output, Integer, 32 bit" on the Modbus server settings.
However, I have the register swap issue reminiscent of the DL205 bi-polar input. It outputs 0 to 10V from 0 to 32767 and -10 to 0 from 32768 to 65535.
I remember having to add logic in the DL260 PLC and then in Lookout I would use the numerical IF;
"(nif(DL3.C102,DL3.V2102*-1,DL3.V2102))*-1"
What a pain that was.
Is there an easy solution?
Thanks in advance.
John B

Bipolar setups are a pain, it seems your if() is similar to what we did as well. Added a rung and set a coil...
Only have a few and have not used the P3000 myself,
Forshock - Consult.Develop.Solve.

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To clarify where we are at. the behavior you are seeing isn't expected. It is a minor bug that we have seen in R&D but haven't been able to reproduce and fix yet.
People have gotten around it by
1) re-making their projects
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We were talking about the aliasing tab you can see on the modbus variables in hte labview project by right-clicking and going to properties;
I assume he checked the box on this tab:
Can you also post your project?
Jesse Dennis
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I'm working with VBAI 2010, in ModBus comunication I need to use VBAI as Slave.
I saw on help file that it is not possible but in menu "Tools\Communication device\" I can see "Vision Builder AI ModBus Adress :"
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Modbus Device
Holding Register Name = 0x40000
Vision Builder AI
Holding Register Address = 0
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Vision Builder AI
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Best regards,
-Christophe

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Hi 148,
I have attached an example vi. It does not run as is just an indication of what i think you need. I wanted to just post a pic of it to give you and idea but my browser kept on crashing and im too intoxicated to figure out why so you can view the example instead.
Would be an idea to run a seperate loop that constantly scans the tcp read vi. If you set it in standard mode, it will either update all read bytes once 'bytes to read' is complete or update with the bytes read once the vi times out. This can then update a functional global that acts as a data buffer and message parser. Your main loop can then poll this for any new input messages. I havent included the functional global just an example of what the dedicated loop should do.
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Attachments:
TCP buffer.vi ‏8 KB

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Edited by: Sunil Joyous on Dec 2, 2009 1:52 PM

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Still taking baby steps each day... please take my hand and help me!
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Yes I did...now toss me a cookie please.
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__0
_ \<,_
Date: Wed, 4 Nov 2009 09:11:06 -0700
From: [email protected]
To: [email protected]
Subject: Work flow? How to link multi-cam sequences for DVD output?
please take my hand and help me!
Well, at least you had the gumption to admit that up front.
>

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Automationdirect P3000 Modbus Communication Lookout 6.5 for +/- 10V Output Module

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