Lookout OPC reads A-B PLC Output word bit 15 as negative.

I am using LabVIEW and Lookout OPC driver to read an output word from an Allen-Bradley PLC and display the bit values as booleans. When bit 15 goes to a logic one, the value the opc driver reads goes negative. this causes the Labview Number to boolean array converter to 'mis-read' the bit values. How can I prevent this mis-read?

I dealt with this problem a couple of years ago.
I had to write a VI that decode the bits and fixed it.
THe VI just checked the MSB and acted accordingly.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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Reading text file and output (to stdout) a list of the unique words in the

Hi,
I have a main method as
main.java
package se.tmp;
public class Main
public static void main( String[] args )
WordAnalyzer.parse( args[0] );
and text file as
words.txt
the quick brown fox jumps over the lazy dog
the quick brown fox jumps over the lazy dog
the quick brown fox jumps over the lazy dog
the quick brown fox jumps over the lazy dog
the quick brown fox jumps over the lazy dog
the quick brown fox jumps over the lazy dog
the quick brown fox jumps over the lazy dog
the quick brown fox jumps over the lazy dog
the quick brown fox jumps over the lazy dog
the quick brown fox jumps over the lazy dog
the quick brown fox jumps over the lazy dog
the requirement is like
I need create this WordAnalyzer class, implement the parse method, and then commit the file. This method takes a single parameter, the filename of the file to parse. The method should read this file and output (to stdout) a list of the unique words in the file along with the number of times each appears in the file.
Can anyone please help me on this?
Thanks.

Where are you having problems?

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.
An OPC server would only add an additional translation of addressing within the configuration. The only real draw back would be the network overhead required to do this processing and not being representative of the end design configuration.
I will reiterated my question in another way:
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.
For testing purposes, I would like to be able to stress the system to failure and have prove capabilities with measured data. The present problem is that I have no basis to establish varying polling rates that effect the measured data transmission.
This raises another question. What handles the Variable Monitor data requests and how is this rate determined?
Thanks for your interest in my efforts.
Steve

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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..\..\[Link_to_Drivers]\OPCclient1.PLC_12.Online.SWITCH_TAGNAME
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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.”
~~~~~~~~~~~~~~~~~~~~~~~~~~

Lookout opc or link 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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..\..\[Link_to_Drivers]\OPCclient1.PLC_12.Online.SWITCH_TAGNAME
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The problem is this: Periodically the write link will stop working. When this happens, all the Lookout switches and even the Lookout pots will lose ability to write to PLC, but the read links are still working. We can read the data and the switch positions, but the changing setpoints with the pots and operating equipment with the switches is then impossible. This "lock up" can be fixed by closing down all the Lookout processes (but not Lookout), and then restarting the Lookout processes.
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This problem is fixed by lookout 6.0.2 updates. It can be downloaded from http://joule.ni.com/nidu/cds/view/p/id/506/lang/en
You need first to login MyNI, and then download lo602_updates.zip. Unzip it and copy all files to lookout folder.
This update is applied to Lookout 6.0.2 server system. You don't need to copy these files to client system.
Ryan Shi
National Instruments

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Hi,
Could someone help me in the setup and configuration of NI OPC server to OMRON PLC (CJ2H model) using FINS Ethernet communication protocol? I already read some materials available in the web but it uses a different PLC and communication protocol. The OPC server is installed in my laptop and I'm using Windows 8 as my OS. I used a cross over RJ45 LAN cable and connected to the ETN21 module of the PLC. I was able to confirmed the communication of my laptop and PLC by pinging the ip address of the ETN21. I also tried to configure the OPC server based on the documents I just read online. I created a channel, device and tag to the OPC server. By the way, I just need to read the data from the tag I created. Can someone also tell me how to monitor the data on the tag? I hope that you could help me. Thank you in advance.

Good day,
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I hope this helps
Alejandro | Academic Program Engineer | National Instruments
Attachments:
OPC Server Help.JPG ‏237 KB

Can I write a data to intrument through Lookout OPC driver sever?

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Hello,
The TechNet Wiki Forum is a place for the TechNet Wiki Community to engage, question, organize, debate, help, influence and foster the TechNet Wiki content, platform and Community.
Please note that this forum exists to discuss TechNet Wiki as a technology/application. If you have a question about another technology (such as Windows), you can ask in another forum. If you're unsure which forum, a
Bing search often works the fastest or ask here:
http://social.microsoft.com/Forums/en-US/whatforum/threads
However, I'd ask in the
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Karl
When you see answers and helpful posts, please click Vote As Helpful, Propose As Answer, and/or Mark As Answer.
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Lookout OPC Communication Problems

I am running a Lookout process with an OPC server to connect to a
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s. I should add that switching from
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point to that will identify the problem.
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Hello Leo,
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How to read the content of ms-word file use pure java???

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I got the following configuration:
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NFS-clients: 2 computers, connected via LAN and WLAN. On standby: auto umount NFS-share via system-sleep-hook with systemd.
This works flawlessly some hours or even days. But after some time, the following happens:
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2b. trying to access that folder via commandline:
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ls: reading directory .: Input/output error
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Any idea what's going wrong?
additional info:
server:
/etc/exports
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clients:
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case $1 in
pre)
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esac
Last edited by Carl Karl (2014-09-21 17:07:47)

Indeed, there could be something interesting in dmesg on the server:
[ 4.190117] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
[ 4.190596] NFSD: starting 90-second grace period (net ffffffff818a9540)
[ 5.445237] [drm] Enabling RC6 states: RC6 on, RC6p on, RC6pp off
[ 5.895519] r8169 0000:04:00.0 enp4s0: link up
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[72346.684716] scsi5 : usb-storage 3-1:1.0
[72347.686518] scsi 5:0:0:0: Direct-Access WD Elements 1048 1022 PQ: 0 ANSI: 6
[72347.687606] sd 5:0:0:0: [sdc] 976769024 512-byte logical blocks: (500 GB/465 GiB)
[72347.690295] sd 5:0:0:0: [sdc] Write Protect is off
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[72348.135398] sdc: sdc1
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[72348.455737] EXT4-fs (sdc1): recovery complete
[72348.455919] EXT4-fs (sdc1): mounted filesystem with ordered data mode. Opts: (null)
[74276.020331] EXT4-fs error (device sda1): ext4_find_entry:1310: inode #14024711: comm nfsd: reading directory lblock 0
[74276.021107] EXT4-fs error (device sda1): ext4_find_entry:1310: inode #14024711: comm nfsd: reading directory lblock 0
(last one repeats several times...)
Indeed, the NFS-share resists on a external WD harddrive connected via USB, /dev/sdc1.
As suggested in the NFS wiki article, the NFS-share is a bind-mount:
/etc/fstab on server:
# fake-root for NFS
/magnet/owncloud/data/carl/files /srv/nfs/myshare none bind,noauto,x-systemd.automount
while /srv is on /dev/sda1.
The external harddrive has an auto-standby (NOT hdparm...) which isn't causing troubles with other services.
So it seems to be a problem connected to this bind-mount to external USB setup....
I'll try to find out whether there is a way to avoid that.
Thanks so far!
Last edited by Carl Karl (2014-09-16 14:30:02)

Lookout OPC reads A-B PLC Output word bit 15 as negative.

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