Triggered AO with Delay

Hi,
I want to trigger a delayed analog output. I am using the DAQmx trigger property node to start the AO after a certain amount of time. Can anyone tell me, what is the shortest delay that can be used with the property node ? Is the timing done through the software or is it hardware controlled ? I am using a M series PCI-6229 DAQ card.
i want to delay the AO by around 20 micro seconds from the digital trigger.
thanks
Colm

Hi Colm,
the Start>>More>>Delay Units Property help says
Specifies the units of Start>>More>>Delay.
Sample Clock Periods (10286)
Complete periods of the Sample Clock.
Ticks (10304)
Timebase ticks.
Seconds (10364)
Seconds.
Start>>More>>Delay
Specifies an amount of time to wait after the Start Trigger is received before acquiring or generating the first sample. This value is in the units you specify with Start>>More>>Delay Units.
So depending either on the Sample clock you've got setup, or the Timebase you're using it is then hardware controller, but you must make sure that you've armed the trigger before it actually arrives.
20uS on a timebase of 20MHz is a resolution 50ns, so a delay of 400.
If you specify in seconds, then it will be calculated and linked to the master timebase.
By deafult the delay units should be on Ticks
Hope that helps
Sacha Emery National Instruments (UK)
Message Edited by SachaE on 03-27-2006 03:59 PM
Message Edited by SachaE on 03-27-2006 04:00 PM
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Fal_client, fal_server triggering when applying with delay .

Hi,
I'm on 10.2.0.3 RAC witn physical standby , old fasion config with no standby redo so shiping only after log switch .
We've got 10h delay and looks like gap resolving via fal client/server is triggered only when the acctual arch log
needs to be recovered and is not found on standby site, no when it is not shipped .
So, is that feature or bug ?
In my understanding gap resolving should trigger as soon as gap is detected ..
Looks like delay we using messed things up .
Regards.
Greg

Hi,
Well, the shipment of archive files is done by Primary database's Background. There is no involvment of Standy database in shipment of archive log files.
Hence Standy database cannot detect the recieved archived log files, unless while recovering. While trying to recover if it finds any missing archive log file, it sends a request to the primary for that particular log file and again Primary Database sends the files.
No, its not a bug, rather a neccessity. As Standby database does not know which sequence# is generated into archive log.
Yes, identifying the missed archived log while recovering will increase the delay. Below the example:
Primary Generates seq#: 100
Recovery process at DR : 90
Files transfered at DR:
90
91
92
93
94
95
96
97 missed
98
98
.. and so on.
Here until Standby recovers 96 seq number, it wont be able to know that Seq# 97 is missing, and hence the delay.
but for this we have to increase the Recovery speed by other ways documented.
Below given link is for Oracle 10g Best Practises: Dataguard Redo Apply and Media Recovery.
http://www.oracle.com/technetwork/database/features/availability/maa-wp-10grecoverybestpractices-129577.pdf
Hope this answers to your question.
regards,
Sajjad

Triggered pulse with variable delay using 6023E, getting started

I am having a hard time getting started with my PCI-6023E. My goal is to use it to create a programically controlled delay between the pulse I am inputting and the pulse I hope to output from the 6023E. I have installed the 6023E into a computer and am trying to trigger using a function generator. I am looking at the output using a scope. I think that maybe I have to "turn on" the output of a certain pin. I can't figure out which pins to connect where. I think I am supposed to use Counter Group Config.vi to control the delay, but i'm not sure. Any help or direction to helpful documents would be very much appreciated.
Thanks,
Emily

Hi Emily,
The PCI-6023E is supported by both the Traditional NI-DAQ driver and the NI-DAQmx driver. Since you are getting started with development of a new application, I would highly recommend the NI-DAQmx driver (right now I believe you are using Traditional NI-DAQ because of the Counter Group Config.vi). See the article here for information on the advantages of the NI-DAQmx driver.
Let's first take a look at the hardware level and what the 6023E is capable of:
The 6023E digital I/O lines are static, meaning that they either output a digital value or read a digital value at the instant the software function is called. Ideally, you would receive a digital trigger and specify in software a delay past the trigger to output the digital value from another line. However, the 6023E does not support triggers for digital tasks.
Any timing or delay will have to be taken care of on a software level. You could continually poll the digital line connected to your function generator to look for the trigger occurrence. When that trigger is detected, a software delay could be implemented before making a digital write to another line. If you choose to go the route of NI-DAQmx, there are a number of shipping examples included with the driver that could get you started. They can be found by going to Help>>Find Examples in LabVIEW to bring up the NI Example Finder. From there you would browse in the directory Hardware Input and Output>>DAQmx
Regards,
Andrew W
National Instruments

Workflow with delay using ABAP OO

Hi,
I am new to workflow and trying to design a workflow where the workflow should be triggered after certain number of days.
For ex: Suppose the sales order is created. Then, I need to fire parallel workflows for Administrator like -
1) 10 days after sales order is created contact department X
2) 15 days after sales order is created, create dispatch order.
I thought of having a workflow with start event 'ABC' and trigger this event 'ABC' from function module which creates sales order. Then have fork for parallel flows mentioned above. But how can I introduce this delay? I checked wait step, but it waits for an event.
Also, is there any document/weblog which describes creating workflows along with ABAP class(Not using BOR object). I checked this link
/people/jocelyn.dart/blog/2006/06/28/getting-started-with-abap-oo-for-workflow-using-the-ifworkflow-interface,
but it does not give corresponding workflow integration.
Regards,
Srini.

Hi,
sorry it took so long to answer.
It is possible to evaluate the latest end date by expression. Therefore you chose expression in field: Reference date.
To get your requested start, you habe to do some work in advance.
Create two new container elements in your workflow for your sales order end date -10 and your sales order end date.
Create a step that calls a Z-Task (you have to create this one!) where you evaluate your Sales order end date and your Sales order end date-10 and write that back into a container element (please check your binding). Alternative back in your workflow include a container operation as a step, where you calculate your latest start date (Sales order end date-10).
Back in your original Step you can now maintain latest start and end date based on your new container elements.
Hth
Ute

Solman CCMS alerts are send with delay

Hello all,
I have set up the availability monitoring with CCMSPING in SolutionManager (EHP1). In rz20 the alert is shown directly after the system crash/downtime etc but the email is send some time later.
Example: Alert in CCMS 07:00:38 CET
Alert sent with SCOT 07:36:50 CET
Emailjob is scheduled every 5 minutes. Does anyone has an idea which causes such a delay?
Thanks
Michael

Hi Michael,
Check in SOST when these mails have been triggered . If it is sent at correct time and received with a delay , then it is an issue with network conjustions . Also check the system time in Tcode STZAC and check whether the time settings are correct .
Eg. Time zone is set correct for the system as well as users etc .
Regards,
Nibu Antony

A problem with delays in timed loops and DAQ

I am programming a simulation for nuclear rewetting for a visitor centre at my company in Switzerland. It involves heating a "fuel rod" and then filling the chamber with water. The pump automatically starts once the rod core reaches 750C. After this, a requirement stipulates that flow rate be checked to ensure the pump is operating at the necessary conditions. If it isn't, the heater must be shutdown to avoid, well... meltdown. However, we must allow 10 seconds for the pump to respond, while still allowing a DAQ rate of 10-100Hz.
The challenge is that I can't add a delay in my main loop else delay all acquisition, but I can't figure out how to trigger a peripheral loop (with DAQ for the single channel of checking flow) from the main loop, and when the peripheral loop determines if flow has initalised, respond back to the main loop with the okay.
I think much of my confusion is in the interaction of the loops and the default feedback nodes that labview is putting in willy nilly. Would the only solution be to have two 'main' loops that don't communicate with eachother but rather do the same thing while operating on different timing? Tell me if you want me to post the file (although its on an unnetworked computer and I didn't think it would be too useful).
Thanks+ Curran
Solved!
Go to Solution.

Here it is! It is not in any form of completion unfortunately.
So reading in the temp with NI9213 and watercolumn height with NI9215, we determine to turn on the pump with NI9472. NI9421 determines whether the pump is on (there is flow) and I must respond accordingly.
I have 3 scenarios similar to this one as well, so having redundant loops with different timing like I mentioned would be way to heavy. I think I may have though up of a solution? At the time the pump is initiated, we record the iteration and wait for a number of iterations that correspond to 10s to pass before fulfilling the pump shutoff requirement?
Attachments:
rewettin1.vi ‏15 KB

Macbook Air 2012 now wakes up with delay

I got a new Macbook Air 13" in July. 2 weeks later I upgraded to Mountain Lion. Since then the login screen wakes up with a delay of a few seconds from sleep. Even though the login screen displays promptly, the keyboard does not respond ... then there is a screen flicker and then only I can type the password.
This is defintely a bug - any idea how to resolve this?

It is either your CD or your Superdrive (you never said explicitly, but sounds like you are using an external USB superdrive).
Have your tried installing CD/DVD sharing on another computer (if that is an option) and trying the install DVD from that computer (and using remote install)? This may rule out the DVDs themselves. If you do this remember:
1) You will have to connect to wireless or wired network when holding down the option key during MBA boot,
2) You will need to run the "remote install MacOS X" application that you have installed on computer with remote DVD drive,
3) The entire process will take a VERY LONG TIME (including the startup on the installer).

Triggered AO with Delay

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