Ethernet modbus over 409999

I have connected my plc with labview by via modbus Ethernet and I have control with holding registers that 400001-40999 but holding registers over that give me 0 all time.
So please tell me if there are some new configuration to overcome this problem.

Hi Nouh,
From looking at your code and creating something similar on my side, I'm interested to see how you have it executing. Do you press the run arrow button or the run continuously button? Without a while loop or any other sort of architecture the VI will only execute once very quickly if the run arrow is pressed, which doesn't allow enough time for the Modbus I/O Server to process a value change. Run continuously does allow for a good connection to the I/O server, however the program must be ended with the abort button (which is usually not good practice). Another tool I used to work with this problem was the Modbus Simluator which can be found in the NI Example Finder (in LabVIEW go to Help>>Find Examples, then search for Modbus). Play around with the simulator and try adding registers via "Create Bound Variables..." with the register values you're looking for.
Tim W.
Applications Engineering
National Instruments
http://www.ni.com/support

Similar Messages

Modbus over ethernet

Is Modbus over ethernet available in labview?

Yes.
http://sine.ni.com/nips/cds/view/p/lang/en/nid/201711

-1950679035 ethernet modbus conection

Good morning
I am having some problems with mi application in the computer. I'm programming in my computer and testing on my work partner's computer. I am reading or writing data into a PLC (Modicon M430) and I used I/O server to do it (with ethernet modbus).
When I build the application, things work perfectly, and i can execute my application on my computer without any problem.
But when I executed the application on my work partner's computer things are not going well, I can't read or write registers.
I thing that the problem is because the I/O server, but I have tried to compile with the library, or with multiple options but I can't.
When I executed on my computer I can see all data on Distributed system manager and on the other computer say that it's not possible to see the data
The error of the program that gives me is:
-1950679035
Shared Variable in program.vi<APPEND>
This error or warning occurred while reading the following Shared Variable:
\\My Computer\'192.168.2.32'\Sensor 1
\\localhost\'192.168.2.32'\Sensor 1
Anyone have any solution??
Thanks!

If the Distributed System Manager isn't running, then something is seriously wrong! Has it ever worked? Have you ever had a successful deployment of Shared Variables? Have you recently installed a new version or updated LabVIEW? These questions are designed to see if something "broke", or possibly never worked in the first place ...
Bob Schor

Ethernet Pseudowire over IP/MPLS

Hello there,
Anyone has any case study example regarding transmitting Ethernet PW over MPLS/IP core network?
Thanks

Hi chris,
Here is a link gives you brilliant explanation and also exampls configuration for EoMPLS and other stuff.
In fact this is taken from the Layer 2 VPN Architectures book by Cisco Press. I found it extremely helpful. It covers both the modes RAW mode(port based) and TAGGED mode(vlan based mode)
http://fengnet.com/book/Layer%202%20VPN%20Architectures/ch07.html#idd1e13647
HTH
Kishore

Ethernet modbus

Ok - noddy question coming up.
I would like to communicate with a Eurotherm DCS via ethernet modbus which I've never worked with before. I've set up my program as a slave according to the ni ethernet modbus example. Do I need to input the IP address of the master or any other information to facilitate communication with the master or does the slave demon take care of all that? However, presumably I need to go into the DCS and tell it how to find the slave and which registers to look for?
A colleague of mine, who is familiar with communicating with a DCS with an inspection program called sherlock, says he would expect me to have to provide information such as master IP address, slave ID number plus register address. There seems no way of adding this information in the slave example (except for the register address). My initial thought is that the slave just needs to write to its own register and not concern itself with the master. Have I got the wrong end of the stick here?
LightWorker

I did wonder this myself. It did occur to me that, as I was expected to provide an IP address and register address, I should be setting up as a master. However, being new to modbus I have probably got the wrong end of the stick.

Possible to use Labview DSC to Modbus over Lantronix using ethernet encapsulation?

Hi,
I'm currently evaluating LabView DSC 2009. I want to connect to a Modbus PLC system, which is rs232, connected via a Lantronix box. I have the Lantronix software installed for com port redirection. I set up a serial Modbus I/O server, and every works great.
I was also playing around with the demo of LabView OPC Servers, and noticed that instead of selection com2, I was able to select ethernet encapsulation, and directly type in the IP address & port of the Lantronix box, and it worked great as well.
However, I noticed that when I close things out using the serial connection, it still leaves the port open & the computer connected to the serial port (verified using the Lantronix Manager). If I use the ethernet encapsulation route, it closes everything completely (since it doesn't use the installed Lantronix software redirector).
I have another user who will occasionally need to connect to the PLC using ProWorx, over the same Lantronix box, using a different computer. This often requires me to manually close out & disconnect the port, unless using the encapsulation method.
My question is: Using the DSC Module (over Modbus I/O server), can I use ethernet encapsulation instead of having to manually/force close the com port?
Thanks,
Jacob

Hi,
As you noticed, there are differences between Modbus RTU, Modbus RTU/IP (encapsulated) and Modbus TCP. The first involves the use of a Com port on your computer and on the PLC. The second involves the use of a Device Sever (TCP Server) without using a Com port on your computer and not on the PLC. The third involves Ethernet media only.
Using Modbus RTU encapsulated, your computer keeps com ports free. So, you don't have to open and close the com ports. This task is performed by the Device Server (between PLC and PC).
I have been using Share variables to read/write from/to an array of singles with success, and definetly it's better than doing it at single read/write.
You will find tha NI OPC Servers and KepServer are the same software.
Now you can read/write from/to an array
All this process is performed without using PC's Com Ports

Communicating using modbus over ethernet

I have downloaded labviews version of the modbus drivers. I looked at the examples that are there and it says to run the slave before you can run the master example. Is there a reason for this? I want to use the master example to talk to the machine I want to interface with. If there is an issue that I am not understanding with this, can someone point this out to me. Thank you for your time.
Ron Deavers, CLD

The MB Serial Master Example VI requires you to have the slave running first so that you can have something to interact with. In theory, as long as your modbus device is running before opening the Master example, you should be OK. However I don't have a modbus device where I'm at to verify this. Have you tried just using the example with your device? If so, what's the outcome? Please let me know!
Logan S.

Error when running ethernet modbus slave demon in an executable - reoccurence

Thought I'd solved this with the help of the mass compile function. However, it seems to have come back. Maybe it never went away.
Brief summary - I'm trying to create an exe of the MB Ethernet Slave example.vi in LV 2013. I can create the exe OK but when I run it I get an error 1003 at invoke node. "This VI is broken or contains a sub VI that LabView can't locate. Verify that you can run the VI. VI path C:\Modbus\Source code\Slave demon.vi."
Well I can run the slave demon VI with no problems. I can also run the MB Ethernet Slave example VI with no problem.
In the MB Ethernet slave example VI there is an invoke node that calls the slave demon vi. I've used the slave demon VI path constant as an input to the invoke node so that the exe shouldn't have a problem locating it.
I've also checked out the sub VIs of the slave demon and they all seem to be present in my project. I've also tried a few different build settings - all to no avail. All VIs have been mass compiled under LV 2013.
Maybe the exe is struggling to locate the TCP functions.
Any help would be much appreciated.
Attachments:
MB Ethernet Example Slave.vi ‏47 KB

I have checked the path and double checked by dragging the VI into an empty path constant. I also created a version that uses the file dialog express VI so that I can select the slave demon VI when the program runs. I've also set the slave demon to be always included in the project build. The error message still appears.
By disabling sections of the slave demon vi I found that a VI called Internecine Avoider was linked to the appearance of the invoke node error message. By disabling this VI I could get the invoke node error message to disappear, although the slave demon then didn't work as intended. This VI is included in my project under the vi.lib so it should be found.

Ethernet default over wireless connection.

when I boot up I want my network to default to the ethernet which is connected to the Dynadock U3.0 before the wireless in the Lenovo x220 laptop. The ethernet is much faster. is there any way I can have this occur automatically - rather than me having to shut off the wireless connection? any ideas?

Mount the TC disk manually.
In Finder use Go, Connect to server.
Type in the following.
AFP://TCname.local (TCname is the actual network name of the TC. I strongly recommend you use SMB names.. ie short, no spaces and pure alphanumeric)
Find out the Network version of the TC name if you don't want to comply to the above rule. The best way is to discover it via netstat scan.
Open network utility.
Locate your TC on it.. since my TC is correctly named it shows up as tcgen4.local
I then type in AFP://tcgen4.local
Then the computer can discover the TC and it will ask for a password. The default is public
Type in whatever you changed it to or public.
The TC disk should now be mounted.
If this fails.. reset the TC to factory and start over. Name it correctly.. all short names, no spaces and pure alphanumeric will be a lot lot easier.
Then manually force the mounting.

Labiew lib for modbus over RS485 over USB

Hi,
I have the following problem which I would be grateful for any help to solve.
I have a digital meter device (lumel NA5) which has RS485 interface, and modbus protocol over it.
A possible solution I'm contemplating is to get a RS485 to USB converter, and then talk to the device from Labview.
I found Labview library for serial and TCP/IP modbus. But is it possible to connect to this device using UCB?
Thanks,
Eyal.

You can use this
1-Port RS485/422 Interface for USB
or if you need more ports...
2-Port RS485/422 Serial Interface for USB
4-Port RS485/422 Serial Interface for USB
With this device the serial ports will show up like any other COM port, you can target it in LabVIEW or third party software.

Ethernet communications over writing RIO on boot up

I have CRio 9068 that writes all setpoints to a text file on board while the program is running. My HMI is Vartech touch screen computer running windows 7 embeded. When power is cycled to the system and it reboots both the controller and HMI I loose my setpoints that were in the text files as they are getting over written from the touchscreen. We are using network streams over ethernet for the communications between devices. Is there any sample codes that I can look at to better understand how to prevent this from happing? I have thought about using a first call wired to time delay off timer then allowing the string to write the new variables but I don't think this is the best solution.

You'll want to Fetch the current values from your cRIO and store them on your HMI. You can see this pattern by creating the LabVIEW Real-Time Control on CompactRIO sample project, opening RT Main.vi on the cRIO and look at the case "Send Control Configuration to UI". Basically the messaging scheme you're talking about should be bydirectional. When your HMI connects to the cRIO it requests an update BEFORE it sends anything out, and waits for the cRIO to respond.

Internet over ethernet, none over Extreme Base Station

I have optical cable to the house (no modem involved). When I connect directly to my mac, the cable company hands out a 64.xx.xx.xx IP address and I get blazing internet. When I connect to the AEBS it hands out a 10.xx.xx.xx IP address (I don't remember ever seeing the cable company hand out that kind of IP address before). Everything appears as if it should work, but I get no internet. The AEBS is set to share a single IP address using 10.xx.xx.xx addressing. The cable company has MAC addresses for both the iMac and the AEBS, so it should work. Everything was working before macworld... any thoughts? Much appreciated.
17" iMac G4 Mac OS X (10.4.4)

Thanks Don.
Before yesterday, the airport extreme base station (AEBS) was connected to my cable from the internet company and working just fine (receiveing a valid IP address and all). Yesterday, I get home from Macworld and my wife tells me we haven't had internet. Upon investigating, I find that the IP address that my AEBS is getting over DHCP is in the 10.xx.xx.xx format. My AEBS is still connected to the cable from my ISP and my computer is getting a full reception over my network with the AEBS, but no internet. I then connect the ISP's cable directly to my iMac over ethernet and PRESTO! a valid IP address in the 64.xx.xx.xx format and internet. My ISP tells me it's probably my AEBS. Today I hard reset the AEBS, re-configured it and got the same negative result (an IP address in the 10.xx.xx.xx format). I have an airport express (express) and decided to try that. I reconfigured it as a base station, and it worked...temporarily. Initially I got a valid IP address in the 64.xx.xx.xx format, internet worked great. I moved it around the room a couple times trying to find an optimal location and it started having the same problem as the AEBS, the only IP address it got from my ISP was an invalid or non-working IP in the 10.xx.xx.xx format. The only similarity between the "outage" of the AEBS and the express is that they were plugged into the same outlet when they went "out". My wife said that yesterday, prior to the AEBS going out, it had accidentaly been unplugged from the wall, and then immediately re-plugged. I'm convinced it's either a power surge issue of some sort which fryed them both (except I am getting an IP address, albeit an imperfect one), incompatible firmware, a virus, or my ISP... I'm really hoping it's the ISP.
17" iMac G4 Mac OS X (10.4.4)

Wake on Lan works with Ethernet, not over Wi-Fi.

Hello, after several months of tests I came to this conclusion.
Wake on Lan only works with Ethernet for my iMac. Wake on Lan over Wi-Fi works for a few hours, but if the iMac is asleep for 6 hours or so, it becomes unavailable... On the other hand, with Ethernet it's always available even if it sleeps for an entire week.
My iMac isn't that old (mi-2011), so I guess it should handle Wake on Lan over Wi-Fi. Is it a software issue?
- I've got a MacBook Pro since Snow Leopard 10.6 and now with Mountain Lion it handles Wake on Lan over Wi-Fi without problem.
- I've got my iMac since Lion. Does the iMac only handle Wake on Lan with Ethernet and works differently compared to the MacBook Pro?
I prefer to use Wake on Lan over Wi-Fi because for the tests I've placed my iMac in the living room in order to plug it to the Time Capsule, but the right place for my iMac is in my bedroom.
I tried to change the MTU size as it is described here: http://osxdaily.com/2012/08/02/fix-os-x-mountain-lion-wireless-connection-proble ms/
Note that "Wake on Lan" is checked in my System Preferences, I don't think it's my router's fault, because my Apple TV, AirPort Express, iPhone 5, iPad 2 and my Printer don't disconnect even when they're asleep (I'm talking about my printer and Apple TV in that case).

loïcfernandezcastrillon wrote:
I'm connected with the WiFi of my Time Capsule (bridge mode). I have this configuration since Snow Leopard, and no troubles...
I understand that, but if your router is not an Apple AirPort Base Station then it introduces an element of uncertainty. Apple has implemented many changes related to wireless networking recently.
You are complicating matters by changing networkoversleep:
networkoversleep - this setting affects how OS X networking presents shared network services during system sleep. This setting is not used by all platforms; changing its value is unsupported.
Solving problems like this requires that you simplify your network environment and eliminate its unknowns. Using third party routers and making unsupported changes runs counter to simplification.
The iMac stays connected to the Time Capsule about 6 hours during sleep. Then it dissapears...
The iMac wakes periodically (every few hours) to inform your router of its network presence for Wake on LAN demands. Try changing your router's DHCP lease period to something longer than a few hours. For a home environment, a few days is more appropriate. This may not solve the problem, but it is better than making unsupported changes to your system.

LabView 2014 - DSC module with Ethernet Modbus: Error 56

Sorry,
I try to connect modbus by Labview 2014 DSC module like this figure, and it occurred error code 56 at "Read Input Registers",
I have look for many soluctions, but still fail, can someone help me? thank you very much!

Did you confirm the address and port of your slave device is correct? Also, is your device a modbus master device or slave device?
I suggest you to read the help first, and then run the corresponding example
You can run the two example to test if the modbus function is OK. Then you can come back to test your third party device.

Mail won't send emailwhile connected to Ethernet, only over wifi

Here it goes.
I have an iMac 21.5-inch, Mid 2011, with Mac OS X Lion 10.7.4. The issue I have is that when I try to send an email, using Mail, from my company's account it will not do so while the computer is connected to Ethernet.
If I go to network settings and disable that option, connecting trough Wi-Fi, it sends the emails like a charm.
Has anyone experienced something like this?

If you're on the company network, you should ask the network administrator for help.

Ethernet modbus over 409999

Similar Messages

Maybe you are looking for