Read / write cluster array?

Hi NG,
is there an easy way to read and write an array of clusters? I've found
neither anything like that in my literature nor in the internet.
I't would be great if someone could help me!
Greetings
Florian

Hi,
you must use "Read File.vi" and "Write File.vi" to read/write array of clusters to the file.
When you write data to the file, you just need to wire your array to "data" input node of "Write File.vi". Also you may wire TRUE to "header" input of this VI. The header with array sizes will be added to the file so you will be able to read array back as an array, not as elements. Read help about this.
When you read data from the file, you need to wire the array of cluster constant to "byte stream type" input of "Read File.vi" to specify the type of data which will be read from file.
Also there are some examples in LabVIEW which could help you. Go to menu "Help->Examples...->Fundamentals->File I/O->Datalog File Examples"
Good luck.
Oleg Chutko.

Similar Messages

How to read flushed cluster array from input queue?

Hi! I'm new to LabView. Can someone please help me?
I want to use a subvi to read a queue which I created in another vi. The created queue holds an array of clusters that I want to unbundle in a for loop in the reading vi. But the output of the flush queue function is a string array (since the subvi has no info on what sort of queue is being input).
I can't connect the unbundle function to a string input; can I use the type cast function to force the flush output to be a cluster? Or is there a better way to do this?
And if so, what is the string constant I need to attach to the "type" input in the type cast function?
And also, I'm told that the cluster is kind of like a "struct"; so is there a way to n
ame it so that other vi's know what it is(i.e. type cast)?
jen

I did look at the help examples, but I couldn't find one that was sending the queue from one vi to another(well, not any that I could understand), and that was really my problem.
I did get the thing to work when it was all in one vi.
You bring up an interesting point about "dequeue" and "flush". Perhaps I am mistaken, but my reasoning for using flush rather than dequeue was the following:
I am using the queue as a data buffer. I need the queue to hold a few minutes of data. This data is dumped to file upon fault event, i.e. it tells me what was going on right before the fault occurred. I need that queue to dump the data and then immediately turn around and start filling up again. I felt that holding on to the queue reference in the save-to-file routi
ne (which involves lots of potentially slow hard disk access) might cause the object to lock and hence not be able to save right away. I don't know how LabView does threading, but if I was writing the threading routine, I would lock any object which was being executed upon in a routine to prevent data collision.
Of course, this begs the question: does LabView lock all objects in a subroutine that is executing? Or just in the part which is unresolved? or does it lock objects at all? Perhaps I should flush the queue outside of the subroutine anyway, so that the subroutine can happily munch on the flushed array while my queue goes back to the business of collecting data?
Am I way off base in how the threading works?
Thanks!
jen

Can I read/write a LabVIEW DataSocket cluster in Lookout?

Can read/write DataSocket text, logical, and numerical arrays but how do I read/write a LabVIEW style cluster datatype (i.e. an array of clusters or a cluster of arrays)?
Thanks!
Tom
Thomas G. Duffey
Engineering and Research Consultants, Inc.
Air Force Research Laboratory
3 Antares Rd.
Edwards AFB, CA 93524
661.275.6172 FAX 661.275.5073
mailto:[email protected]
http://neverworld.net

You should be able to wire your cluster or array of clusters or cluster of arrays directly into the datasocket write/read primitives. They are polymorphic and should handle the data directly.
Marc Monroe
National Instruments

Write /read ini cluster limits / ogtk

Hello,
Some one kows what is the limit with "write read ini cluster " from ogtk
i tried with array of cluster and it works well, but with with composite cluster that report an error.
i create a composed cluster definie in vi attached , it reach to write and file seems to be well defined
but i don't succeed to read it after it send me error message.
best regards
important to read file "palier" palier.txt have to be rename in palier.cpt else you can create one using write palier.vi
path is code in hard so you have to change path to your proper path in read palier.vi
Tinnitus
CLAD / Labview 2011, Win Xp
Mission d'une semaine- à plusieurs mois laissez moi un MP...
RP et Midi-pyrénées .Km+++ si possibilité de télétravail
Kudos always accepted / Les petits clicks jaunes sont toujours appréciés
Don't forget to valid a good answer / pensez à valider une réponse correcte
Solved!
Go to Solution.
Attachments:
palier.jpg ‏175 KB
write palier.zip ‏40 KB
palier.txt ‏1 KB

i forgot error mess:
CLAD / Labview 2011, Win Xp
Mission d'une semaine- à plusieurs mois laissez moi un MP...
RP et Midi-pyrénées .Km+++ si possibilité de télétravail
Kudos always accepted / Les petits clicks jaunes sont toujours appréciés
Don't forget to valid a good answer / pensez à valider une réponse correcte
Attachments:
error_mess.jpg ‏28 KB

Cluster and Read Write XML

In my applications I allow users to save their settings. I used to do this in a Ini file. So I wrote a Vi that could write any cluster and it worked ok. When I discovered that in the newer versions of LabVIEW you could Read/Write From/To xml, I changed inmediatly because it have some advantages form me but I am having some trouble.
Every time I want to save a cluster I have to use
Flatten To XML -> Escape XML -> Write XML
and to load
Load From XML -> Unescape XML -> Unflatten from XML.
I also do other important things each time I save or load settings. So it seems to be reasonable to put all this in just two subvi's. (One for loading, One for saving). The problem is that I want to use it with any cluster
What I want with can be summarized as following:
- SaveSettings.vi
--Inputs:
---Filename
---AnyCluster
---Error In
--Outputs
---Error Out
-LoadSettings.vi
Inputs:
---Filename
---AnyCluster
---Error In
Outputs
---DataFromXML
---Error Out
I have tried using variants or references and I was not able to make generic sub vi (sub vi that don't know what is in the cluster). I don't want to use a polymorphic vi because it will demand making one load/save pair per each type of settings.
Thanks,
Hernan

If I am correct you still you need to wire the data type to the Variant To Data. How can you put in a subvi ALL that is needed to handle the read/write of the cluster? I don't want to put any Flatten To XML or Unflatten From XML outside.
The solution I came out with INI files was passing a reference to a cluster control but it is real unconfortable because I have to itereate through all items.
When a control has a "Anything" input, is there any way to wire that input to a control and remains "Anything"?
Thanks
Hernan

Read/Write 2d numeric array or string array into bin file

Can anyone pls help me to resolve this problem
Attachments:
bin file.vi ‏9 KB

You are still using the wrong format.
Whatever you are doing has nothing to do with a binary file.
You are still using way too much duplicate code.
All you probably need is read/write from spreadsheet file, no need to reinvent the wheel.
Your code will fail if the numbers contain decimal digits (since your array is DBL, it could! If your array only contains integers, you are using the wrong numeric representation).
You string code will fail if the array elements contains tabs, for example.
You still don't need a sequence structure.
LabVIEW Champion . Do more with less code and in less time .

Missing FP READ (Float Array-IO).vi & FP WRITE (Float Array-IO).vi

I am a complete newbie. I am trying to use the Field Point Express vi to collect data from some Field Point modules. When I go to past the Field Point Express VI into my sheet, the applications starts looking for a couple of sub-vi's. It is missing the FP Read (Float Array-IO).vi and the FP Write (Float Array-IO).vi. I am not sure if I erased these accidentally or what. Is there a way to replace these missing VIs?

These vi's are usually located in C:\Program Files\National Instruments\LabVIEW XX\vi.lib\FieldPoint\Polymorphic Read.llb. First, check if they are present and try to manually link them when the LV is trying to load them. Otherwise, you can try to uninstall your FP drivers and then perform a re-install. The FieldPoint drivers are located in your Device Drivers CD.
Hope this helps.

Nested IPE (In Place Element) usage when accessing Cluster/Array data via DVR

I am sharing data across several VIs and loops via a DVR, and accessing the data via a DVR IPE. The data is a cluster of arrays. The diagram below (VI attached) illustrates the structures invloved, but not the structure of the application.
(The diagram above does not include initialization of the arrays, as it is intended only to illustrate the Cluster1 data type. Array lengths could be 100.)
The DVR (DVR1) is passed to multiple VIs of the application at startup.
Each VI executes loops that either read or write particular elements of each array (fArray1 or fArray2).
I believe the DVR IPE (B1-DVR) provides blocking so that only one task can modify the data (Cluster1) at any time.
Case 1 illustrates how I currently WRITE to array elements. The outer IPE (block B1) is rolled into a VI (not shown) that takes DVR1, Index, and Value as inputs.
Cases 2 - 4 illustrate 3 additional methods that remove one or both of the inner IPEs (B2-Cluster and B3-Array).
Case 2: IPE B3 (Array Index/Replace Elements) is replaced with a non-IPE 'Replace Array Subset'.'
Case 3: IPE B2 (Unbundle / Bundle Elemnts)' is replaced with a non-IPE cluster 'Unbundle'/'Bundle'.
Case 4: removes both B2 and B3.
I implemented case 1 a long time ago. When I had to do the same thing again recently, I did case 4. When I stumbled across my earlier implementation, I was a bit suprised
Which of the 4 cases should take the least time (or resources) to execute? I think case 4 has as few array allocations as any of the other 3.
The attached image did not capture the Buffer Allocation marks, so I marked the ones that differed with a red "B".
I am only interested in differences in how the arrays are handled, so I see no signioficant differences.
Is this one of those cases where LV doesn't need my help?
Incidently, I recently wrote a small app with shared data and decided to try FGVs to share array data. For small arrays, 10^7 iterations, and an FGV based array-element read followed by a element write, the FGV was faster. 1.2us per read/write for FGV vs 3us per r/w for an DVR/IPE based read/write (like above).
Peter
LV 2011 SP1, Windows 7 64-Bit
Attachments:
IPE.vi ‏9 KB

Option 1 is a definite no and as far as I know it has been NI's explicit intention to steer clear from it. I believe there's an idea in the IE which asks for this.
I agree that option 2 makes sense, but I don't think it should be something the user specifies. Either LV can detect it automatically or it can't, but I doubt NI would let you have an option which creates the possibility for this kind of bug.
I'm not sure, but the mark as modifier option on the IPES might be the option you're looking for. I know that it exists and I know very roughly what it does, but the documentation for it is very limited and I never actually played around with it, as usually I don't need these kinds of optimizations.
You may well be right that a new option on the IPES is desirable and you should probably add it to the idea exchange.
As for NIWeek, I'm not going this year, so I have no idea what kinds of sessions are around, but it's a great place to find people who know what they're talking about and ask them about it directly. Certain people in LV R&D would probably be ideal for this and if you ask relevant people, you might even get their names. I'm sure buying them a beer would also help to loosen their tounges. If you ask me, this type of interaction is the main value of the conference, not the sessions themselves.
Try to take over the world!

Oracle coherence first read/write operation take more time

I'm currently testing with oracle coherence Java and C++ version and from both versions for writing to any local or distributed or near cache first read/write operation take more time compared to next consecutive read/write operation. Is this because of boost operations happening inside actual HashMap or serialization or memory mapped implementation. What are the techniques which we can use to improve the performance with this first read/write operation?
Currently I'm doing a single read/write operation after fetching the NamedCache Instance. Please let me know whether there's any other boosting coherence cache techniques available.

In which case, why bother using Coherence? You're not really gaining anything, are you?
What I'm trying to explain is that you're probably not going to get that "micro-second" level performance on a fully configured Coherence cluster, running across multiple machines, going via proxies for c++ clients. Coherence is designed to be a scalable, fault-tolerant, distributed caching/processing system. It's not really designed for real-time, guaranteed, nano-second/micro-second level processing. There are much better product stacks out there for that type of processing if that is your ultimate goal, IMHO.
As you say, just writing to a small, local Map (or array, List, Set, etc.) in a local JVM is always going to be very fast - literally as fast as the processor running in the machine. But that's not really the focus of a product like Coherence. It isn't trying to "out gun" what you can achieve on one machine doing simple processing; Coherence is designed for scalability rather than outright performance. Of course, the use of local caches (including Coherence's near caching or replicated caching), can get you back some of the performance you've "lost" in a distributed system, but it's all relative.
If you wander over to a few of the CUG presentations and attend a few CUG meetings, one of the first things the support guys will tell you is "benchmark on a proper cluster" and not "on a localised development machine". Why? Because the difference in scalability and performance will be huge. I'm not really trying to deter you from Coherence, but I don't think it's going to meet you requirements when fully configured in a cluster of "1 Micro seconds for 100000 data collection" on a continuous basis.
Just my two cents.
Cheers,
Steve
NB. I don't work for Oracle, so maybe they have a different opinion. :)

Hmi wizard for indicators inside cluster array

I am setting up a config screen for use with the DSC and tag engine. I have an indicator and analog value inside a cluster array. Can you use the hmi wizard to make unique conditions for the indicator in each array element?? or would I have to use a sub vi to write the values to the elements inside the clusters??
Attachments:
TOOLPASS_CHANNEL_CONFIG_DATA.vi ‏17 KB

Hi,
The simple control in the cluster or in an array will not have a way to invoke the HMI Wizard to create simple HMI code because the control turns into a more complicated control type. Using a sub vi to unbundle the cluster should be a workaround for this application.
Regards,
Remzi A.

Scrollable cluster arrays as control, writing programmatically at the same time?

I would like to have a cluster array (just an example, you may suggest better solution), where each row (cluster-element) contains signal selection from combobox, and its value and unit.
I would like to have a signal list, where in each row, I can select which signal I want to show e.g. "motor speed", "motor torque", "motor power". And when signals are selected, the value of the
signals are automatically updated elsewhere. So basicly, I want to select which signals I monitor, and then watch them change over time. I use single cluster array because I want it to be scrollable. The problem is:
* let's say I have one row in the array. Then I add a row by editing the control in the GUI (now the array control has size 2).
* I have property node (write: array control -> value) to update the values and units in my software.
* I use array control output as the input in the subVI where I read my selections and write updated signal values.
* It can happen that I use that array control output when it still has size 1, and while I have added the second element, the software updates the control, and overwrites my new element addition.
So, I run into writing conflict. Only single user, just this problem. How should I avoid this?
(e.g. how can I know that user is not interacting with the control, so that I can update its value and unit fields)

First suggestion is to post the code you have.
But that being said what you want to do can be done. I think the problem you are having is a race condition between the user and the software. Where the user chagnes the value and the software changes it back. I suggest reading the value of the control and replacing its value but keep the signal names the user entered, then write that back to the control.
Another suggestion is to have two separate arrays, one that is signal selection, and one is values. Then you only need to update the values table with the new data and the signal names never get overwritten. You'll likely want to couple the two arrays so when one index value changes the other changes with it. This can be done with an independent scrollbar control.
Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.

Windows Server 2012 - Hyper-V - iSCSI SAN - All Hyper-V Guests stops responding and extensive disk read/write

We have a problem with one of our deployments of Windows Server 2012 Hyper-V with a 2 node cluster connected to a iSCSI SAN.
Our setup:
Hosts - Both run Windows Server 2012 Standard and are clustered.
HP ProLiant G7, 24 GB RAM, 2 teamed NIC dedicated to Virtual Machines and Management, 2 teamed NIC dedicated to iSCSI storage. - This is the primary host and normaly all VMs run on this host.
HP ProLiant G5, 20 GB RAM, 1 NIC dedicated to Virtual Machines and Management, 2 teamed NIC dedicated to iSCSI storage. - This is the secondary host that and is intended to be used in case of failure of the primary host.
We have no antivirus on the hosts and the scheduled ShadowCopy (previous version of files) is switched of.
iSCSI SAN:
QNAP NAS TS-869 Pro, 8 INTEL SSDSA2CW160G3 160 GB i a RAID 5 with a Host Spare. 2 Teamed NIC.
Switch:
DLINK DGS-1210-16 - Both the network cards of the Hosts that are dedicated to the Storage and the Storage itself are connected to the same switch and nothing else is connected to this switch.
Virtual Machines:
3 Windows Server 2012 Standard - 1 DC, 1 FileServer, 1 Application Server.
1 Windows Server 2008 Standard Exchange Server.
All VMs are using dynamic disks (as recommended by Microsoft).
Updates
We have applied the most resent updates to the Hosts, WMs and iSCSI SAN about 3 weeks ago with no change in our problem and we continually update the setup.
Normal operation
Normally this setup works just fine and we see no real difference in speed in startup, file copy and processing speed in LoB applications of this setup compared to a single host with 2 10000 RPM Disks. Normal network speed is 10-200 Mbit, but occasionally
we see speeds up to 400 Mbit/s of combined read/write for instance during file repair
Our Problem
Our problem is that for some reason all of the VMs stops responding or responds very slowly and you can for instance not send CTRL-ALT-DEL to a VM in the Hyper-V console, or for instance start task manager when already logged in.
Symptoms (i.e. this happens, or does not happen, at the same time)
I we look at resource monitor on the host then we see that there is often an extensive read from a VHDX of one of the VMs (40-60 Mbyte/s) and a combined write speed to many files in \HarddiskVolume5\System Volume Information\{<someguid and no file extension>}.
See iamge below.
The combined network speed to the iSCSI SAN is about 500-600 Mbit/s.
When this happens it is usually during and after a VSS ShadowCopy backup, but has also happens during hours where no backup should be running (i.e. during daytime when the backup has finished hours ago according to the log files). There is however
not that extensive writes to the backup file that is created on an external hard drive and this does not seem to happen during all backups (we have manually checked a few times, but it is hard to say since this error does not seem leave any traces in event
viewer).
We cannot find any indication that the VMs themself detect any problem and we see no increase of errors (for example storage related errors) in the eventlog inside the VMs.
The QNAP uses about 50% processing Power on all cores.
We see no dropped packets on the switch.
(I have split the image to save horizontal space).
Unable to recreate the problem / find definitive trigger
We have not succeeded in recreating the problem manually by, for instance, running chkdsk or defrag in VM and Hosts, copy and remove large files to VMs, running CPU and Disk intensive operations inside a VM (for instance scan and repair a database file).
Questions
Why does all VMs stop responding and why is there such intensive Read/Writes to the iSCSI SAN?
Could it be anything in our setup that cannot handle all the read/write requests? For instance the iSCSI SAN, the hosts, etc?
What can we do about this? Should we use MultiPath IO instead of NIC teaming to the SAN, limit bandwith to the SAN, etc?

Hi,
> All VMs are using dynamic disks (as recommended by Microsoft).
If this is a testing environment, it’s okay, but if this a production environment, it’s not recommended. Fixed VHDs are recommended for production instead of dynamically expanding or differencing VHDs.
Hyper-V: Dynamic virtual hard disks are not recommended for virtual machines that run server workloads in a production environment
http://technet.microsoft.com/en-us/library/ee941151(v=WS.10).aspx
> This is the primary host and normaly all VMs run on this host.
According to your posting, we know that you have Cluster Shared Volumes in the Hyper-V cluster, but why not distribute your VMs into two Hyper-V hosts.
Use Cluster Shared Volumes in a Windows Server 2012 Failover Cluster
http://technet.microsoft.com/en-us/library/jj612868.aspx
> 2 teamed NIC dedicated to iSCSI storage.
Use Microsoft MultiPath IO (MPIO) to manage multiple paths to iSCSI storage. Microsoft does not support teaming on network adapters that are used to connect to iSCSI-based storage devices. (At least it’s not supported until Windows Server 2008 R2. Although
Windows Server 2012 has built-in network teaming feature, I don’t article which declare that Windows Server 2012 network teaming support iSCSI connection)
Understanding Requirements for Failover Clusters
http://technet.microsoft.com/en-us/library/cc771404.aspx
> I have seen using MPIO suggests using different subnets, is this a requirement for using MPIO
> or is this just a way to make sure that you do not run out of IP adressess?
What I found is: if it is possible, isolate the iSCSI and data networks that reside on the same switch infrastructure through the use of VLANs and separate subnets. Redundant network paths from the server to the storage system via MPIO will maximize availability
and performance. Of course you can set these two NICs in separate subnets, but I don’t think it is necessary.
> Why should it be better to not have dedicated wireing for iSCSI and Management?
It is recommended that the iSCSI SAN network be separated (logically or physically) from the data network workloads. This ‘best practice’ network configuration optimizes performance and reliability.
Check that and modify cluster configuration, monitor it and give us feedback for further troubleshooting.
For more information please refer to following MS articles:
Volume Shadow Copy Service
http://technet.microsoft.com/en-us/library/ee923636(WS.10).aspx
Support for Multipath I/O (MPIO)
http://technet.microsoft.com/en-us/library/cc770294.aspx
Deployments and Tests in an iSCSI SAN
http://technet.microsoft.com/en-US/library/bb649502(v=SQL.90).aspx
Hope this helps!
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How can I read/write data files (text file) from PL/SQL Script

I had an oracle forms pl/sql program to read/write a data file (text file). When this code is run on a command line as a PL/SQL script using the SQL*Plus I am getting an error:
-- sample.sql
DECLARE
vLocation                VARCHAR2(50) := 'r:\';
vFilename                VARCHAR2(100) := 'sample.dat';
vTio                   TEXT_IO.FILE_TYPE;
vLinebuf               VARCHAR2(2000);
vRownum               NUMBER        := 0;
-- use array to store data FROM each line of the text file
TYPE           array_type IS VARRAY(15) OF VARCHAR2(100);
vColumn      array_type := array_type('');
PROCEDURE prc_open_file(p_filename IN VARCHAR, p_access IN VARCHAR2) is
BEGIN
    vTio := TEXT_IO.FOPEN(vLocation||p_filename,p_access);
EXCEPTION
    WHEN OTHERS then
      -- raise_application_error(-20000,'Unable to open '||p_filename);
      message(sqlerrm);pause;
END;
PROCEDURE prc_close_file is
BEGIN
    IF TEXT_IO.IS_OPEN(vTio) then
       TEXT_IO.FCLOSE(vTio);
    END IF;
END;
BEGIN
--extend AND initialize the array to 4 columns
vColumn.EXTEND(4,1);
prc_open_file(vFilename,'r');
LOOP
      LTEXT_IO.GET_LINE(vTio,vLinebuf);
      vColumn(1) := SUBSTR(vLineBuf, 1, 3);
      vColumn(2) := SUBSTR(vLineBuf, 5, 8);
      vColumn(3) := SUBSTR(vLineBuf,10,14);
      Insert Into MySampleTable
      Values
        (vColumn(1), vColumn(2), vColumn(3));
      EXIT WHEN vLinebuf IS NULL;
   END LOOP;
   prc_close_file;
END;
SQL> @c:\myworkspace\sql\scripts\sample.sql;
PLS-00201: identifier 'TEXT_IO.FILE_TYPE' must be declaredIt works on the oracle forms but not on the SQL*Plus. Is there an alternative method using a PL/SQL script? A simple sample would help. Thanks.

Did you ever noticed the search box at the right side of the forum?
A quick search (limited to this years entries) brought up this thread for example
Re: UTL_FILE Examples

How do I write whole array in single write ?

Hi Jgurus,
I have fetched the record from Oracle and I wants to write those in a file . But problem is for every record in a record set file.writebytes write to a OS file. I don't want this single record write since it will write one by one. I have crores of records to fetch. Critical issue is performance. Can I picked up the rows in bunch and write to file ? I have stored (on smaller record size) all rows in array and now want to write the whole array to file in one OS write operation. Is there any way to do this ? Do any one suggest the better approach ?
For real scenario file size will become around 300MB. I did it but it writes one by one record using next() from record set.
Please advice.
--RajivK.

Can you give any example for a small String or int array. I have stucked at this point. I have wrote the array using for loop but for each iteration in a loop it writes. I have 5 lakh values stored in array. Can anybody show how do write whole array to os file in one write operation instead of getting one by one value and printing it. I am new to java please give details or sample so that I can understand.
Thanks in advance.
--RK.

Incorrect data type when writing to FPGA Read/Write Control

I have run in to a problem this morning that is causing me substantial headache. I am programming a CompactRIO chassis running in FPGA mode (not using the scan engine) with LabVIEW 2012. I am using the FPGA Read/Write Control function to pass data from the RT Host to the FPGA Target. The data the RT host is sending comes from a Windows host machine (acting as the UI) and is received by the RT Host through a network published variable.
The network published shared variable (shared between the RT and Windows system) is a Type Def cluster containing several elements, one of which is a Type Def cluster of fixed point numerics. The RT system reads this shared variable and breaks out the individual elements to pass along to various controls on the FPGA code's front panel. The FPGA's front panel contains a type def cluster (the same type def cluster, actually) of fixed point numerics.
The problem comes in the RT code. After I read the shared variable I unbundle the cluster by name, exposing the sub-cluster of fixed point numerics. I then drop an FPGA Read/Write Control on the RT block diagram and wire up the FPGA reference. I left click on the FPGA Read/Write Control and select the cluster of fixed point numerics. I wire these together and get a coercion dot. Being a coercion dot hater, I hover over it the dot and see that the wire data type is correct (type def cluster of fixed point numerics), but the terminal data type is listed as a cluster containing a Boolean, code integer and source string, also known as an error cluster. I delete the wire and check the terminal data type on the Read/Write Control, which is now correctly listed as a type def cluster of fixed point numerics. Rewiring it causes the terminal to revert back to the error cluster. I delete the wire again and right click on the terminal to add a control. Sure enough, a type def cluster of fixed point numerics appears. Right clicking and adding an indicator to the unbundle attached to the network shared variable produces the proper result. So, until they are attached to each other, everything works fine. When I wire these two nodes together, one spontaneously changes to a error cluster.
Any thoughts would be appreciated.

My apologies I never got back to responding on this. I regret that now because I got it to work but never posted how. I ran in to the exact same problem today and returned to this post to read the fix. It wasn't there, so I had to go through it all over again.
The manifestation of the problem this time was that I was now reading from the Read/Write FPGA front panel control and writing to a network published shared variable. Both of these (the published shared variable and the front panel control) were based on a strict type defined cluster, just like in the original post. In this instance, it was a completely different cluster in a completely different project, so it was not a one-off thing.
In addition to getting the coercion dot (one instance becoming an error cluster, recall), LabVIEW would completely explode this time around. If I saved the VI after changing type definition (I was adding to the cluster) I would get the following error:
Compile error. Report this problem to N.I. Tech Support. Copy cvt,csrc=0xFF
LabVIEW would then crash hard and shutdown without completing the save. FYI, I'm running LabVIEW 12.0f3 32-bit.
If I would then reopen the RT code, the same crash would occur immediately, ad nauseam. The only way to get the RT code to open was to change the type defined cluster back to the way it was (prior to adding the new element).
I didn't realize it last time around (what originally prompted this post), but I believe I was adding to a type def cluster when this occurred the first time.
So, how did I fix it this time around? By this point I tried many, many different things, so it is possible that something else fixed it. However, I believe that all I had to do was to build the FPGA code that the RT code was referencing. I didn't even have to deploy it or run it... I just had to build it. My guess is that the problem was the FPGA Reference vi (needed to communicate with the FPGA) is configured (in my case) to reference a bit file. When the development FPGA Main.vi ceases to match the bit file, I think that bad things happen. LabVIEW seems to get confused because the FPGA Main.vi development code is up and shows the new changes (and hence has the updated type def), but when you ask the RT code to do something substantial (Open, Save, etc), it refers to the old bit file that has not yet been updated. That is probably why the error getting thrown was a compile error.
I'm going to have to do an additional round of changes, so I will test this theory. Hopefully I will remember to update this post with either a confirmation or a retraction.

Read / write cluster array?

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