OPC server respond time

Hi, I am using LabVIEW to interact with OMROM PLC. I am facing a problem where the latency time between PLC signal and LabVIEW is around 2 to 3 second. Is there any method or setting to increase the respond time?

If you mean NI OPC Server, it is a trial.
If you mean can Lookout act as an OPC server, it is full.
Forshock - Consult.Develop.Solve.

Similar Messages

Why does my Fieldpoint OPC server time out?

I'm using Fieldpoint Explorer 3.01 with 1600 ethernet modules. I'm using Wellspring Solutions' Object Automation as an OPC client to read and write to I/O. Everything works fine on one computer running Win NT 4.0. Another computer, however, is running NT Server 4.0, and the OPC reads/writes from Object Automation work for exactly 1759 seconds (or approx. 121 minutes), and then the Fieldpoint Server "times out", and the only way to get it to work again is by shutting down and restarting Object Automation, assumedly this somehow reinitializes communication with the server. This is a repeatable error that occurs at exactly the same time, every time. This only happens with the National Instruments Fieldpoint OPC server (I'm
using several) on one of the machines. I tried reinstalling the Fieldpoint OPC Server several times to no avail. I've used other OPC clients (from OPTO22, or Rockwell, Matrikon, Kepware) and can't communicate until Object Automation is shutdown and restarted. Any help or ideas on how to further troubleshoot would be appreciated, thanks.

Aaron, attached are 3 log files generated in a test that I ran. The test used Object Automation to turn on and off a relay channel (OPC item: Common FP Res\FP-RLY-420 @4\Channel 1) every 10 seconds. I used the Matrikon OPC delegator with the OPTO22 Test Client (written by Rockwell) to monitor the channel at the same time (the delegator would NOT work with Object Automation directly). The OPCDelegatorOPTO22TestClient.txt file is the log file for this client. Basically, the test started around 13:07 and lasted the usual 121 minutes. Then the OPC writes stopped around 15:08, at which time I tried to manually read and write to the channel using the OPTO22 client, generating the errors towards the end of the logfile. Incidentally, I don't k
now what the errors at the beginning of the file are, but there are no noticable problems until after 121 minutes. I then tried to use the Kepware OPC test client with delegator to read and write to the channel but this also did not work, and the logfile OPCDelegatorKepwareTestClient.txt is for that test. The other logfile (OAlogfile.txt) is the logfile generated by OA, see the end of file for the error. They should all be text files, not sure why one of them is listed as binary below. Let me know if this helps or if there is anything else I can provide.
Attachments:
OAlogfile.txt ‏526 KB
OPCDelegatorKepwareTestClient.txt ‏50 KB
OPCDelegatorOPTO22TestClient.log ‏517 KB

Ical problem already 3 weeks after the update, get the message every time username or password is incorrect as I do with this password and username in mobileme bowl. now get the message The server responded with \ 'HTTP/1.1 409 Conflict \'. can someone he

Ical problem already 3 weeks after the update, get the message every time username or password is incorrect as I do with this password and username in mobileme bowl. now get the message
The server responded with \ 'HTTP/1.1 409 Conflict \'.
can someone help me

Ical problem already 3 weeks after the update, get the message every time username or password is incorrect as I do with this password and username in mobileme bowl. now get the message
The server responded with \ 'HTTP/1.1 409 Conflict \'.
can someone help me

Entering description of event into iCal, pasted too much text into event, responded with The server responded with an error. Preferences is greyed out, and window pop up comes up every time I open iCal and doesn't go away. Force quit, still opens. Help?

While pasting event description into iCal, accidently pasted too much text, causing "The server responded with an error" pop up. This pop us includes the event description, but because of the mass amount of text, the window shoots off the screen to the bottom, so if there was an exit red "x" available, it isn't visible or accessible. The iCal>preferences is greyed out and I have force quit and it pops up each time I use iCal. Is this even fixable?

I can see that this issue has been quite extensive, and frustrating, and I am so sorry for all that has happened societygirl! I would like to help you work this issue out. Please follow & send me a Direct Message, so I can get your account specifics and help finally bring this to a resolution.
Thank you,
MichelleH_VZW
Follow us on Twitter @VZWSupport

Response time between LabVIEW w/DSC module and RSLinx OPC server hosting FlexLogix PLC tags too long

We are experiencing communication response time delays between LabVIEW with DSC module and RsLinx OPC Server hosting all FlexLogix PLC tags (around 500-600 tags).
The nominal response time for the system watchdog is < 500ms, but we occasionally have spikes of up to 1.5 seconds once every few days even when the system is idling.
Changing more than six PLC connected shared variables at the same time from LabVIEW also causes the watchdog response times to spike above 500ms.
Our watchdog is programmed so that LabVIEW toggles the watchdog bit to 1 as soon the shared variable event detects that the PLC has toggled it to 0. The PLC, however, waits 300 ms until it toggles it.
Our system:
Windows XP SP3
LabVIEW 9 F3
RSLinx Opc Server v2.54
Allen Bradley FlexLogix PLC

What is your update rate set for in the RSLink OPC server?
You aren't toggling the same flag from both ends are you?
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

What is scan time (or polling frequency) of OPC Server of Labview

What is the scantime of OPC Server.

Hi Aithal,
First of all, thank you very much for posting this additional information, as it is much more useful to help you out going forward.
To clarify, when interacting with PLCs, LabVIEW is acting as a client and the PLC (via an OPC Server) is the server. If you wished to share some data from LabVIEW to other applications via OPC, this is technically possible as well, since the LabVIEW shared variable engine acts as an OPC server.
1. I am not sure in terms of speed whether you would be able to capture this amount of data in this amount of time, as this is dependent on the device (PLC ) that you are communicating with, network traffic (if it is ethernet), etc. The data rate at which you can capture from a particular PLC with new data is going to be something you will need to determine empirically.
2. Most commonly, yes, people use an OPC server to communicate with a PLC (or sometimes Modbus). This is frequently something that is provided by their PLC manufacturer on a CD or for download, but in some instances not. We do offer Industrial Automation OPC Servers, which provides support for many common PLCs.
Once you have done this, you may either use datasocket to communicate with the OPC server, or we recommend the LabVIEW DSC Module, as it enables you to bind shared variables to your OPC items, and also adds logging, alarming and security to the variables.
3. It entirely depends upon your PLC. If it supports serial communication, then you could likely use NI-VISA commands to interface with it, and a good starting point would be the example in the Example Finder entitled "Basic Serial Write and Read.vi".
Best regards,
-Sam F, DAQ Marketing Manager
Learn about measuring temperature
Learn how to take voltage measurements
Learn how to measure current

Suppress the pop-up box in iCal when "The server responded with an error"

So there are tons of questions already on this site about this pop-up error in iCal when trying to connect to Google calendars or MobileMe calendars. My issue is that the connection is fine 90% of the time, but every now and then the connection fails (it checks every 5 minutes) and I get this pop-up.
Now in a perfect world, this error would not result in a pop-up that demands my immediate attention, but would fail silently and simply try again 5 minutes later. Normally Apple's software design is sensible and would do things this way, so I'm totally confused why they think a pop-up (and bouncing dock icon) is anything but annoying, especially when I know it's not a big deal and will probably connect successfully next time.
Soooo... is there a top-secret way I can suppress this pop-up box? It is one of those things that can drive one insane. I even switched to BusyCal for a while but decided it wasn't quite worth $50 just to be rid of the pop-up.

Is this the pop-up you get?
The request for account “[email protected]” failed.
The server responded with
“HTTP/1.1 502 Bad Gateway”
to operation CalDAVAccountRefreshQueueableOperation.
I've never seen it before but am getting it this evening (UK time). Also if I try to log in to MMe Calendar it's not logging in but going to 'find my iPhone' like it did when Mail was mucking about a few weeks back.

Ical: Server responded with an error. no error

The server responded with an error.
The request for “Your INR Result: PT INR 2.6 05/14/2014
INR Low Range: 2.5 - INR High Range: 3.5
Warfarin Tab (MG): 5mg Peach
**CONTINUE YOUR SAME WARFARIN DOSE BELOW.**
According to our records, your current Warfarin instruction is as follows:
Sunday (mg): 5 MG
Monday (mg): 5 MG
Tuesday (mg): 5 MG
Wednesday (mg): 7.5 MG
Thursday (mg): 5 MG
Friday (mg): 5 MG
Saturday (mg): 5 MG
Please have your next Protime/INR blood test on: Follow up date: 06/18/14
Your INR Result: PT INR 2.6 05/14/2014
INR Low Range: 2.5 - INR High Range: 3.5
Warfarin Tab (MG): 5mg Peach
**CONTINUE YOUR SAME WARFARIN DOSE BELOW.**
According to our records, your current Warfarin instruction is as follows:
Sunday (mg): 5 MG
Monday (mg): 5 MG
Tuesday (mg): 5 MG
Wednesday (mg): 7.5 MG
Thursday (mg): 5 MG
Friday (mg): 5 MG
Saturday (mg): 5 MG
Please have your next Protime/INR blood test on: Follow up date: 06/18/14
Your INR Result: PT INR 2.6 05/14/2014
INR Low Range: 2.5 - INR High Range: 3.5
Warfarin Tab (MG): 5mg Peach
**CONTINUE YOUR SAME WARFARIN DOSE BELOW.**
According to our records, your current Warfarin instruction is as follows:
Sunday (mg): 5 MG
Monday (mg): 5 MG
Tuesday (mg): 5 MG
Wednesday (mg): 7.5 MG
Thursday (mg): 5 MG
Friday (mg): 5 MG
Saturday (mg): 5 MG
Please have your next Protime/INR blood test on: Follow up date: 06/18/14
Your INR Result: PT INR 2.6 05/14/2014
INR Low Range: 2.5 - INR High Range: 3.5
Warfarin Tab (MG): 5mg Peach
This information, which I highlighted in red, shows up on a separate page from and above the calendar page, and is half the width of the standard page; and repeats all the three times on the page. I cannot close ical without force quitting. I cannot access ical preferences as suggested in another answer to a similar problem, because the "separate page" remains dominant. I tried ridding the computer of the calendar plist, that did not work. I cannot discard ical because the computer will not allow me to trash. I am really befuddled.
Fortunately, it only affects ical on my MacBook Pro running 10.9.2- it has not affected my iPad or iPhone, both running ios 7.2... they seem to be syncing with iCloud correctly. Anyone had this animal in their zoo lately?

I read another response to a similar question posted a couple of years ago. I turned off the Wifi, restarted iCal offline, and that eliminated the message. However, as soon as I turned on the Wifi the message again appeared, the app froze requiring a Force Quit, and the game is still afoot. NO SOLUTIONS ANYONE?

ICal issue - "The server responded with an error"

Hi All. I've been having this error pop up on my iCal for the last week after the last iOS update and it's driving me a little batty.
I don't have any shared calendars, appointments loaded in. I'm just running the iCal calendar frm icloud between my Air and my iPhone.
Error that pops up reads:
The server responded with an error.
The URL ***icloud***/principal/ encountered HTTP error 404. Make sure the URL is correct.
I haven't changed anything in settings. The appointments are still syncing between my computer and phone however, this pop up comes up every 5-30 seconds on my computer if iCal is open.
Ideas on how to fix it?

Is this the pop-up you get?
The request for account “[email protected]” failed.
The server responded with
“HTTP/1.1 502 Bad Gateway”
to operation CalDAVAccountRefreshQueueableOperation.
I've never seen it before but am getting it this evening (UK time). Also if I try to log in to MMe Calendar it's not logging in but going to 'find my iPhone' like it did when Mail was mucking about a few weeks back.

When I try entering a new event in iCal on my MacBook Air, I get an error message popping up on my screen that says: The request for account "iCloud" failed. The server responded with "502" to operation CalDAVSetPropertyQueueableOperation. Help!!??

When I try entering a new event in iCal on my MacBook Air, I get an error message popping up on my screen that says:
The server responded with “502”
The request for account “iCloud” failed.
The server responded with “502” to operation CalDAVSetPropertyQueueableOperation.
The request for account “iCloud” failed.
I am then given the option of staying Online or going Offline.
Can anyone help me?
thanks

Hello b.krushel,
Thank you for using Apple Support Communities
Any number of things could cause this issue, so I would recommend this article named iCloud: Troubleshooting iCloud Calendar found here http://support.apple.com/kb/TS3999.
These sections in particular:
General Troubleshooting
Make sure there are no current issues listed on the System Status that affect iCloud Calendar. The System Status is located on the iCloud Support webpage.
Make sure you have fully enabled iCloud Calendar for the client you are using (for more setup and troubleshooting information on iOS, OS X, Windows and iCloud.com, see the additional details below).
Check to see if the issue you are seeing is covered in iCloud Help. To search iCloud Help, visit help.apple.com/icloud.
Check your settings and preferences as something may not be set up correctly. For example, having incorrect date and time settings can cause issues which are easily resolved by entering the appropriate settings.
Troubleshooting Calendar on OS X Mountain Lion (iCal on OS X Lion)Note: For instructions on setting up iCloud Calendar with Calendar or iCal on your Mac, see iCloud Setup.If you are having trouble with Calendar or iCal on a Mac and you are using iCloud Calendar, try each of these steps, testing after each to see if the issue is resolved:
Make sure you are using OS X Lion v10.7.2 or later. Click here for help verifying the version of OS X you are using.
Make sure your computer is online. Attempt to view www.apple.com and iCloud.com. If you can't connect to the Internet, your iCloud calendars and events will not update in iCal. Click here for more information about troubleshooting your Internet connection.
Verify that your iCloud member name is entered into the iCloud Preference pane in System Preferences. See iCloud Setup for more information about setting up iCloud on a Mac.
Make sure you enter and update calendar information in the iCloud section of Calendar or iCal. Only calendars and events in the iCloud section of the Calendar or iCal Calendar list will be pushed to iCloud. Both Calendar and iCal for the Mac support the display of and interaction with multiple accounts and datastores, for example, iCloud, On My Mac, Exchange, Google, and so on. This makes it easy to create or modify events or calendars in a section of Calendar or iCal that may not be updating iCloud. Learn more about moving local calendars to iCloud.
In some cases, you may find that you have data duplicated in both the local On My Mac and the iCloud sections of Calendar or iCal. Learn more about resolving this issue.
You can make the iCloud calendar your default calendar for all new events. In Calendar on OS X Mountain Lion, choose Calendar > Preferences > General, or in OS X Lion, choose iCal > Preferences > Generaland under the Default Calendar heading, select one of the Calendars under the iCloud heading. Close the Preferences window to save this change.
If recent changes simply don't appear, try forcing Calendar or iCal to refresh by selecting Refresh All from theCalendar menu.
Make sure your account was successfully created in Calendar on your Mac (or iCal). After upgrading to iCloud Calendar, you may need to quit and reopen Calendar (or iCal). To confirm your account is configured correctly in iCal:
Open Calendar (or iCal).
Open Calendar (or iCal) Preferences.
Click Accounts. You should see an account with your iCloud member name entered.
Turn iCloud Calendars off and back on
Quit Calendar (or iCal).
Choose Apple () menu > System Preferences > iCloud.
Remove the checkmark in the checkbox next to Calendars.
Close System Preferences and wait about a minute.
Open System Preferences and choose iCloud.
Replace the checkmark next to Calendars.
Close System Preferences.
Open Calendar (or iCal) and test to see if the issue has been resolved.
Restart your computer. This may sound simple, but it does reinitialize your network and application settings and can frequently resolve issues.
Take care,
Sterling

Problems using Modbus TCP accessed by NI OPC Server

Hi there,
i'm using NI OPC-Server to access a measurement module. The buildup is quite easy, my system with NI OPC, a modbus gate and there the module connected with RS485.
There's a thermocouple to provide me some sample data.
But there's the point. I know, my data is in the Holding Registers and I can access them, but every data type I'm trying doesn't bring my my data out, just any other (sometimes Huge with e34, sometimes very small like e-13...) sorts, i can't understand.
The type provided by the module should be single precision.
In Lookout the address used to be is 41000 in Labview it's just 999 and in the "target" OPC-Server I get some values at 401000 but not useful.
I also get the same results accessing 301000 in different types.
Read/Write or Read Only is equal.
I've tried to tell my OPC that the values are Strings, Floats, Words, BCD and all other possible ways OPC offers me, but nothing results in a usable temperature.
I hope I missed something and you could suggest it.
Cateros
Solved!
Go to Solution.

Thanks for your reply.
in LabVIEW I'm using the provided Modbus Libraries. If I unbundle the Holding registers, my value appears at Holding Register [0], I'm type casting it to single and get the sample temperature. (Address 999->unbundle->typecast->value)
In NI OPC, I'm reading ( [depends on zero based addressing] 300999/301000 equal to 400999/401000) an already typecasted Holding Register [1] compared to LabVIEW (and the value changes in the second or third digit behind the comma and they are changing at the same time). Data type in the tag is float.
Another disturbing thing is even if I change in the options "using zero-based addressing in registers" my value does not change.
If I'm reading two addresses close to each other (as you mentioned 401000-401001) I'm getting an unknown data type and no results. How do I read multiple addresses without such errors? And how do I specify a special register to read?
Scaling should not be the problem, I am having three ways to get my value (FTP-Server on the gate (just a *.dat file with correct type), software the the module manufacturer (while measuring and configuring the module) and LabVIEW(as can be seen above)) .
Sadly, I have not found any useable modbus documentation about the module (just it can use modbus, you have the registers, you could read/write and fine)
When I'm adding a second couple to the module, in LabVIEW Values in Holding Register [2] and Holding Register [3] appear and are changing.
Cateros

How do I resolve this related Ical message? The server responded with "400" to operation CalDAVUploadDropBoxFileQueueableOperation.

How do I resolve this related Ical message? The server responded with “400” to operation CalDAVUploadDropBoxFileQueueableOperation.

I am having this problem too...and also I (most of the time) can't invite anyone on my google apps domain to a meeting. WEIRD! HELP!!! I just switched to Mac from PC...this was supposed to be EASY!
I get all kinds of error messages...
1) The request for “Test Appointment” in “[email protected]” in account “yyyy.com Google” failed. The server responded with “400” to operation CalDAVScheduleEventQueueableOperation. *My google calendar *IS* updated despite the error, but the appointment is greyed out on my calendar.
2) The URL https://calendar.google.com/calendar/dav/[email protected]/user///calendar.google.com/calendar/dav/[email protected]/user/ encountered HTTP error 404. Make sure the URL is correct. The URL *IS* correct.
Also, when I try to invite people to appointments, iCal adds random attendees and frequently will not add an attendee if they are in my domain. HELP.

How can I write to a Siemens S7-300 PLC tag from OPC Server.vbai page by using a Knob object ?

I am using NI OPC Server and I can read Siemens S7-300 PLC tags such as thermocouple values from the PLC. Additonally I can write manually a constant value to that tag by selecting it in the NI Distributed System Manager. And I can read the written value from NI Distributed System Manager or from NI OPC Server. But I can not write any value to the S7300 PLC tags such as by using a knob object at the NI Vision Builder AI Inpection (.vbai) page.
Any help is welcomed. Thanks in advance.
Attachments:
manual_writing_to_plc.png ‏298 KB

The tutorial at the following location explains how to use Vision Builder AI as a OPC server.
https://decibel.ni.com/content/docs/DOC-18647
http://www.ni.com/white-paper/13574/en
To allow VBAI to connect to an OPC Server (i.e. act as an OPC client), you need to purchase and install the DSC Run-time System.
Once installed, you can create an OPC I/O client using the Distributed System Manager, create variables bound to OPC tags, then create VBAI network variables that are bound to these variables.
Another possible technical solution to connect to OPC Servers supporting Data Access 2.0 is to use the datasocket API in a Run LabVIEW step.
http://forums.ni.com/t5/Machine-Vision/Read-and-Write-with-OPC-through-NI-Vision/m-p/2048278/highlig...
Hope this helps.
-Christophe

Failed to load resource: the server responded with a status of 404 (Not Found)

I uploaded 2 x small Wordpress sites to Azure this morning using the local Git repository on my iMac. They worked fine when I checked them earlier and now I see the websites are not loading correctly with 30+ errors on each effecting all .css, .js and
.jpg files - using view source, these are the error messages.
Failed to load resource: the server responded with a status of 404 (Not Found)
When I open the web root in my ftp client the files are definitely there as you would expect. I am using Azure Small Basic Hosting, any thoughts on what has gone wrong and how to fix the websites?
Site 1: http://goo.gl/VONbHc
Site 2: http://goo.gl/wdTP67
Liam

Hi,
I tested your site 1, when I open http://goo.gl/VONbHc, it direct me to
http://templestudios.azurewebsites.net/ ,so I think you create templestudios as your azure website name. it seems that the page will go directory to another page, one image html code as below.
<img width="300" height="225" title="Portrait Photography" class="thumb wp-post-image" alt="Portrait Photography" src="http://www.photostudio.ie/wp-content/uploads/portrait-girl-dublin-300x225.jpg">
The image was not found seems more relate to
http://www.photostudio.ie , I open this site, contents are as following screenshot.
Hope this helps
Jambor
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Failed to load resource: the server responded with a status of 405 (Method Not Allowed) XMLHttpRequest cannot load (WCF service URL). Invalid HTTP status code 405

Hi,
while consuming the WCF service POST method Jquery, getting error in Chrome and firefox, in IE Its working fine.
ERROR:Failed to load resource: the server responded with a status of 405 (Method Not Allowed) XMLHttpRequest cannot load (WCF service URL). Invalid HTTP status code 405.
Jquery used to call:
$.support.cors = true
$.ajax({
type: "POST",
url: serviceURL,
data: JSON.stringify(managedProps),
useDefaultXhrHeader:false,
contentType: "application/json; charset=utf-8",
dataType: "json",
//processData: true,
crossDomain: true,
success: function (data, status, jqXHR) {
alert("sucess");
error: function (xhr) {
alert("error");
WCF sevice Web.config
<webHttpBinding>

<binding name="crossDomain" crossDomainScriptAccessEnabled="true" transferMode="StreamedResponse" />
</webHttpBinding>
</bindings>
<services>
<service name="DynamicRefinerWCF.DynamicRefiner">
<endpoint address="" behaviorConfiguration="REST" bindingConfiguration="crossDomain" binding="webHttpBinding" contract="DynamicRefinerWCF.IDynamicRefiner" />
<endpoint address="mex" binding="mexHttpBinding" contract="DynamicRefinerWCF.IDynamicRefiner" />
<host>
<baseAddresses>
<add baseAddress="http://localhost/example.svc" />
</baseAddresses>
</host>
</service>
</services>


</system.serviceModel>
<system.webServer>

<modules>
<remove name="WebDAVModule" />
</modules>
<handlers>
<remove name="WebDAV" />
</handlers>
<directoryBrowse enabled="true" />
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*"/>
<add name="Access-Control-Allow-Headers" value="Content-Type"/>
<add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS"/>
<add name="Access-Control-Request-Headers:" value="*" />
<add name="Access-Control-Request-Method:" value="*" />
</customHeaders>
</httpProtocol>


</system.webServer>
</configuration>
Thanks,
Swathi

Right on - I have done that a number of times.

OPC server respond time

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