Nipalsm ans OPC problems

I have just taken delivery of a cFP-180 network interface and after installing the software, the PC reports an NIPALSM.EXE application error on start up. Also, when I try to run the National Inst Server Explorer it too crashes. I can however read from the cFP-180 using MAX.
I have uninstalled and re-installed the software and it is the same.
nipalsm.exe is Ver 1.15.39.3.0
nipximu.dll is Ver 1.0.0.49153
I am using Windows XP
Any ideas what could be wrong?

Thanks for your reply (and your patience), it is much appreciated. The Keithley driver is available from:
http://www.keithley.com/support/data?asset=50494
The release notes for the above (http://www.keithley.com/support/data?asset=50493) say that the Keithley drivers actually use the NI-VISA runtime so I would be very interested in discovering what is involved in using this directly, rather than using Keithley's IVI. I will check this out.
The notes also refer to know issues with NIPALSM but I dont know if this is relavent.
I am not able to access the equipment today but I will find out the software info you have requested tomorrow.
Thanks again
Message Edited by Tony Dean on 05-23-2007 09:15 AM

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Lookout opc problems

I am using Lookout 6.0.2 on a new Win XP desktop. The Lookout OPC client object is used for communications via Rockwell Software RSLinx's (Professional Rev 2.43.01.23) OPC server to ControlLogix PLC's over ethernet. In other words, the Lookout communicates with RSLinx by OPC, and the RSLinx communicates with PLC's by ControlNet.
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This problem is intermittant and not repeatable. Does anyone have idea how to troubleshoot this problem, or have an way to isolate and fix this problem?

doug:
You may want to repost in the Lookout board:
http://forums.ni.com/ni/board?board.id=190
~~~~~~~~~~~~~~~~~~~~~~~~~~
"It’s the questions that drive us.”
~~~~~~~~~~~~~~~~~~~~~~~~~~

Dsc opc problem

Hi!
Im trying to connect Labview to Siemens S7-200 with PC-Access OPC server. I tried to use IO Serer and connect it to PCAccess, to PLC. Then I tried to connect it with datasocket to PC Access, and both times i had the same problem. Communication was too slow. For example, when i changed some value in labview, opc server reached that value in 5 seconds. How can i solve this problem?
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This problem could be because either the scan rate from the PC-access OPC server is too slow, the client program is reading data too slow, or both.
Are you using Shared Variables or Datasocket?
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Also, you can check in the tag or variable manager how fast the data is updating.
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Solved!
Go to Solution.

Thanks NitinD and billko for your answers.
I've already solve the problem, i'll try to explain it (excuse my English please).
Before, I put "DataSocket Open", "DataSocket Read" and "DataSocket Close" in the same loop iteration, without time between open the connection and read from the OPC Server. This made than the result of the reading was '0' all the time. Here we can see a screenshot:
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Lan to lan VPN between RV325 ans ASA5505 Problem

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ASR9000 100G-SR with ONS-15454 100G-LC-C - problem with local SR connection

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Proble with synchronization

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rahul_p wrote:
Problem :- I have a doubt with the oprion c, it simply returns the value of count then why synchronized the getCount() function, mostly we synchronized the function which changes the value of variable.In terms of concurrency and getting a valid value, no syncing is needed on the getter. (This would not be true if it were a long.)
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Communication Problem in Mitsubushi PLC A2SH with OPC 4.5.1

While communicating with Mitsubushi PLC A2SH thru OPC 4.5.1 , it displays time out error , the settings of the Com port of the system is Baud = 9600, Parity = odd
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You might increase the 'Recieve timeout' from 250ms to some higher values on the object (driver) and you might increase in Options >> Serial Ports... >> Receive Gap from 20 to a bigger value like 50.
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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)
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Cateros

Lookout OPC Client – Asynchronous I/O and Update Rate serious problems (Sequence of data)

I am using the Lookout OPCClient driver to connect to AB PLCs (EtherNet/IP protocol) and power measurement equipment (Modbus TCP protocol). The OPC server is the NI OPC Servers. The data that are read out from PLCs and PMs are energy meter readings, energy counters, power, voltage, current, frequency, power factor and el. energy quality measurements (THD). That energy meter readings are being stored in SQL database.
I am experiencing a serious problem regarding the accuracy of the meter readings. Several times per day, randomly, meter readings are losing the time sequence. For example, sequence is: 167, after few seconds 165, 166. In other words, present value followed by two previous old values. That generates a serious problem in our application that is expecting a naturally rising sequence of counter values.
Analyzing further, I isolated the problem to the connection between Lookout OPCClient and OPC Server. I made a simple application in Lookout 6.7 (opcproc.lkp, attached) with OPCClient parameters: NIOPCServers, OPC2, Asynchronus I/O, Update rate: 10000, Deadband: 0.0, that is reading just one tag from NI OPC Servers demo application (simdemo.opf).
By using OPC diagnostic tool from NI OPC Servers I record the sequence of OPC requests and responses. I found out that OPCClient sends every 2.5 sec “IOPCAsyncIO2::Refresh2()” call that is request for refreshing of all items in one OPC group. Few milliseconds later OPC Sever responds with callback function “IOPCDataCallback:: OnDataChange()(Device Refresh)” that actually refresh the data.
This periodic sequence is intrinsic to the OPCClient and cannot be disabled or changed (by my knowledge). This sequence is periodically interrupted by “IOPCDataCallback:: OnDataChange()” caused by update rate parameter of OPCClient (client is subscribed to server for periodic update of changed items).
In the case of demo application on every 4 refresh callbacks caused by refresh requests (2.5 sec) there is one update subscription callback determined by Update rate (10 sec).
QUESTION 1:
What is the purpose of update sequence and update rate when we have every 2.5 sec fresh values?
PROBLEM
The problem arises when we have a large number of items in OPC group. In that case the OPC Server starts to queue refresh requests because they cannot be fulfilled in 2.5 sec time because of large number of I/O points that must be scanned. At the same time update subscription callbacks are running at the period determined by Update rate. I observed in my production system that regular update callbacks has higher priority than refresh callbacks from the queue. That causes the loosing of timed sequence of data. After the update callback with fresh data, sometimes follow one or two refresh callbacks from queue with old (invalid) data. By adjusting Update rate parameter (1 hour, 2hours …) I can postpone the collision of data refreshes but I cannot eliminate it. Furthermore, the 2.5 sec automatic refresh are large burden for systems with many I/O points.
QUESTION 2:
Is there a way to disable automatic refresh request every 2.5 sec and just use update requests determined by Update rate?
QUESTION 3:
Is there a way (or parameter) to change the period of automatic refresh (2.5 sec)?
This problem is discovered for Lookout 6.5, 6.6 and 6.7 so I could say it is intrinsic to OPCClient. If I use synchronous I/O requests there is not an automatic refresh, but that is not an option for large systems.
Thanks!
Alan Vrana
System engineer
SCADA Projekt d.o.o.
Picmanova 2
10000 ZAGREB
CROATIA
T +385 1 6622230
F +385 1 6683463
e-mail [email protected]
Alan Vrana
SCADA Projekt d.o.o.
ZAGREB, Croatia
Attachments:
opcproc.zip ‏4 KB

The physical connection from LV to the switch is (I believe) copper crossover to fiber converter into a switch. Then, fiber from the switch to the end device (relay). The relay has all of the typical modbus registries and has been verified by inducing signals in to the system and measured/polled in LabVIEW and observed Variable Monitor. I am working with LV 8.2 and 8.5.
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I must answer the question to management that relates to data collection, test results and analysis; how often are you polling the client in relation to the outcomes measured? At this time I can not point at any configuration in the set up and execution that directs the data framing rate. I only measure the traffic and work with results. This needs to be clearly identified based on the relay modbus/tcp design capability of supporting an fixed number of client requests per second.
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Create OPC I/O server and front panel data socket problem

Hi all!
I installed the NI OPC server. When I try to create a new server I/O in a LabVIEW project I don't see the "OPC client" possibility.
Is something software missing?
Other question: I tryed to connect to OPC server using front panel data socket but my problem is same. When I click the numeric control and I go to the "data operation" menu there is no possibility to make data socket connection.
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I attached two pictures about my problem.
Solved!
Go to Solution.

Dear vajasgeri1,
do you have LabVIEW DSC module installed? Without it you will not have the OPC client funtionality.
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BR,
Mateusz Stokłosa
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National Instruments

Nipalsm ans OPC problems

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