ElectronGuru

MrPLC Member
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Everything posted by ElectronGuru

  1. Access Allen Bradley PLCs from a web browser?

    Typing the AB device's IP address into the address field of any browser should pull up the AB device's web page. Some devices will require that the web pages feature be enabled. When you do this, you'll only get the details (firmware, configuration, diagnostics, etc) for that IP device. So you'd get the info for a ethernet card in a ControlLogix chassis, but not the controller card, itself. From the web page of the device with the IP address, you should then be able to browse the chassis and get the same info for each individual device. 
  2. RSLogix 5000 Tag Scope

    If you're using version 28 or higher of Studio5000, you can use parameters instead of tags. While you would still have to copy and paste them from one program to another, they are editable online in the run mode, and therefore much more flexible. Instead of scoping a local tag with an alias to an output, I create an output parameter of the data-type BOOL, and give a "connection" to the I/O point. If I ever need to, I can change that connection while online and in the run mode. 
  3. V21 is when they changed from RSLogix 5000 to Studio 5000. I believe that all ControlLogix L6 and below controllers are hard-stopped at V20, and there are only a handful of L7s that will dip down to V19. Use Rockwell's Product Compatibility & Download Center (PCDC, link is below) to determine what you can flash your controller to, but make sure you have that version of Logix or Studio available on your laptop. You'll need it to upgrade the existing stored project to the same level as the newly flashed controller, and then download to that controller. https://compatibility.rockwellautomation.com/Pages/MultiProductSelector.aspx?crumb=111
  4. I just now quickly glanced at V17, 18 and 19 release notes and didn't see anything that jumped off the page as the filter being a new feature. I currently only have V28 through 32 installed on my laptop, so I can't dig around and find where to activate that feature. In the versions I have, it doesn't appear that the search filter can be toggled on or off. If it could be, I would expect it to be under Tools, Options, which is where you should start looking if you haven't already. You might also check under the View tab. It's kind of a silly placebo, but have you tried closing and re-opening the project to see if it shows back up?  Anyone else have any thoughts or solutions on this?
  5. Is V16 the one that's not showing the search filter? Have you seen that search filter in that project before?
  6. You appear to have different versions in the two images. The one appears to be V28-ish; the bottom one is definitely an older version. I looked around in my V28 and V32 and can't find anything to toggle that filter on and off. Check the versions and their release notes to see when they added that filter. I'd be curious myself to know if that can be turned on and off.
  7. Program Mode is used to download projects to the controller or to have easier time of making online edits. The controller is in Program when the controller's is key/toggle switch is place in PROG, or when placed in Program from the online tool bar in Studio if the key/toggle is in Rem.  Many output cards have the feature you've shown that allows analog cards to go to zero, hold last state according to code scan, or go to a user-defined value, and for digital outputs to turn outputs on, off, or hold last state. 
  8. PowerFlex DC Drive

    Have you auto-tuned the drive? If not, try doing a speed tune (parameter 1027) and see if that helps. I have seen loose motor or encoder wires, damaged or misaligned encoder couplings, etc. cause issues with responses to changes in speed reference. Also, incorrect values on encoder and motor nameplate parameters can cause speed control problems. Do you get the problem on decel commands, as well? You have relatively long accel/decel times (50/45 secs) but your S-curves are on the default settings. If you're driving a high-inertia load, overshooting the commanded speed reference might be expected without some S-curve added.
  9. PowerFlex 755 F12 (HW OverCurrent)

    That's quite a tale and I can't wait to hear how (and if) you're able to get it solved.  Since this works on some drives and not others, my first inclination would be to run online compare tools in CCW or Drive Executive to see what differences there are in firmware, I/O configurations, and parameter settings. For me personally, I've found that encoders can cause a lot of issues when running test modes such as what you described above, especially if the encoders are set to quad check. Maybe start there from within the compare tool(s)?  
  10. Powerflex 700s (Alarm condition)

    The alarm description you're getting " Fallada eix arrastr" according to Google Translate is "Drag Axis Failure", which I can't find in the Fault/Alarm Descriptions in the manual (Publication 20D-PM001D-EN-P - March 2019). @VFD Guy is correct that to better help you solve this, we could really use the exact numeric alarm code. Whether you're using an A3 or A6 HIM, you should be able to use the HIM to navigate to the Alarms section, follow @VFD Guy's suggestion of deleting the alarm que, and see what alarm then shows up. The yellow flashing STS light on the front of the drive indicates a Type 2 alarm, meaning you're not going to start that drive until you find and remove the condition causing the flashing light. Going back to your original post, you said that, " an alarm condition exist (run inhibit stat) bit 1 is true ( no enable)". I assume you're looking at parameter 156, "Start Inhibits". When bit 1 is true the book instructs us that there is "no enable" as seen by the drive. Sometimes inputs fail and the drive can't see that the 24 volts is present at a terminal block. If I were there in your facility, I would immediately look to see which digital input is programmed as Enable, then go look at the digital input status parameter to see if that bit is true when 24 volts is applied at the correct terminal block. There are cases where drive peripherals can cause an inhibit that manifests itself as a "drive not enabled" alarm condition. For example, if you have a Safe Speed Monitor card installed and someone placed that SSM in Program Mode, the drive would be disabled, you'd have a yellow light, and no other indication as to what's causing the start inhibit. Program Mode in an SSM card is logically in series with Drive Enable, but there's nothing in the HIM, drive parameters, or Alarm que that would indicate this is the issue. That said, I started a Connected Components Workbench project and added a PowerFlex 700S drive to it and I don't see that SSM is an available option for that drive, but I'm using V10 (V13 is the most current) so I might not have the latest available info. The other thing that concerns me is you said this is not a new installation, which leads me to believe that this was working for a period of time, then stopped. Which, in turn, always leads me to the same question; what changed? Did someone change a parameter setting? The easiest way to check this is to get on line with the drive using CCW and check the "Show Non-Defaults" to see what has changed from factory settings. (I can't remember if the A3 HIM has this feature but the A6 does. @VFD Guy, do you know if there's a changed parameters feature on the A3?) If used as a drive enable, did the digital input burn out? As mentioned above, find out where digin for enable is programmed, and check that the drive sees that bit go true when 24VDC is applied. Is there a peripheral somewhere that is holding the drive in "not enabled"? Is there a 20-COM card, or any other extras installed on the drive that might be causing the issue? Start with easiest stuff first, and work your way through it. 
  11. Powerflex 700s (Alarm condition)

    @VFD GuyExactly. That’s for the hair splitting elaboration. 
  12. Powerflex 700s (Alarm condition)

    My mistake; it appears to only be the PowerFlex 70 that requires digital input 6 to be the drive enable input. 
  13. Powerflex 700s (Alarm condition)

    Is this a new installation, or one with recent changes made to it? Or is this something that was working and then stopped? Assuming it may be a new installation, some of the PowerFlex 7- series drives require the Enable to be wired to terminal 6. If your safety/enable circuit is wired to a different terminal, you could be inhibited even though the circuit is true.
  14. Analog output fault

    Sounds like you found it. Each family of I/O cards have their own options, all with similarities and differences. The 1756 analog output diagnostic cards have a feature that lets you ramp to the user defined value in fault mode. The 1768 input cards have output files that aren't even described in the manuals. Sometimes we just have to muscle though it with trial and error to what works. 
  15. Can you decrease the scan time in Studio 5000

    @pcmccartney1 yeah, I misread the OP, as well. And unfortunately, I'm not well versed in View, either. I'm more of an ME guy and live primarily in FT Studio.
  16. Can you decrease the scan time in Studio 5000

    Gotchya, and sorry for the misunderstanding. @Joe E. and @pcmccartney1 have given good advice above. Be careful about getting too low on the display update rate because it can take up a lot bandwidth on your network.
  17. How can I improve my counter's accuracy?

    Counting from 0 - 1000 in 500ms is pretty quick when related back to changing the state of an output. Any compare instruction (EQU, LIM, etc) will only remain true for the period of time the .ACC is either equal to, or within the limit of the instruction, which is this case is likely just a few milliseconds.  When I've come across similar challenges I've had pretty good luck using an OTL as the output instruction. Even if the EQU is true for only 1ms during the scan, that's enough to latch the output regardless of whether it's in a continuous, periodic, or event task. The drawback is, of course, you will now also need an OTU to unlatch the output at some later point. As mentioned above, more info about your controller, version of Studio, and process would be helpful.
  18. Can you decrease the scan time in Studio 5000

    Logix controllers do not have regularly scheduled input and output scans in the same manner that an older SLC500 did. Logix looks at tags as needed when the code being scanned is utilizing said tags. As for how much time a controller spends actually scanning tags/code, that is a matter of how many rungs of code, how well the code is written, etc. The only way I know to decrease the scan time is to write and organize the code to scan as efficiently as possible. I don't know of any "gas pedal" we can push to make it scan faster. I assume you're looking at the scan times in the task monitor(s), yes? You're not looking at the watchdog timer setting? There is a limit to how long the code is allowed to be scanned, which is set by the watchdog timer.  In Logix, each task will have its own watchdog timer with a default setting of 500ms (same as your stated scan time), which can be changed from 0.1 to 2B ms. Whatever value the watchdog timer is set to is the longest amount of time the task is allowed to be scanned before the watchdog timer for that task throws a controller fault. I'm only mentioning this because your stated scan time is (perhaps coincidentally) the same as the watchdog default setting, and I just wanted to make sure we're on the same page. Hope this helps. 
  19. MikeC

    If the TON instruction is repeatedly restarting in the run mode you may have a free-running timer, which is a timer that is deliberately resetting itself through its own .DN bit. The Timer.DN tag is placed on an XIO instruction in series with the TON, and it runs over and over and over, without ever stopping. This is only one of a hundred possibilities. Two things you can do: Right click on the timer tag and run a cross reference report to find out everywhere it's being used and figure it out. Follow @Michael Lloyd's suggestion and post the code here so we can try to help you narrow it down.
  20. 1734-IB8S "Blip"

    Electricity is extremely predictable except in three scenarios: ground faults, arc faults, and lightning. In those cases, typically all bets are off. It is interesting that you had false indications on only one of several I/O cards on a backplane. When something like this happens, I usually ask myself, "what's different". Some random thoughts, in no particular order: With no minor faults in the fault log, I'd be inclined to think that no faults occurred and this is truly an electrical field device/wiring anomaly, rather than a card problem. Are the limit switches physically located where they might be more susceptible to stray currents during bad weather than other related I/O? Is the shielding or grounding different on this card or its I/O points/field devices compared to others on the backplane?  Did you get this error on inputs 0-3 and 4-7? Is the 24V field power supply shared with any other I/O? Have you checked the RTBs for dust or loose connections? Find anything that looks suspicious?
  21. servo auto tuning

    Auto-tuning is the process of introducing a new motor to a drive. It typically only needs to be done on new installations, or when a motor is damaged and needs to be replaced. Most rotating auto-tune functions will energize the motor for a few seconds without rotating it, accelerate the motor to something below its nameplate rated speed, decelerate to energized but not moving again (ramp to hold), and then announce, if it's a good tune, that auto-tuning is complete.  The reason for this is that every motor has its own "finger print", and auto-tuning allows the drive to become more familiar with that particular motor. Once auto-tuning is completed, the drive and motor will run more efficiently together, and presumably last longer. You don't need to monitor or change any parameters during this process; just let it run. Personally, I prefer to run the auto-tuned without the motor being coupled to the load. Some drives will offer coupled (inertial) tunes, while other may require uncoupled (rotational) tunes. But you should never have process material in the system if you do a coupled auto-tune.
  22. Powerflex 755

    There are only two jumpers that I know of on the MCB for the PowerFlex 755 drive; Safety and Enable for frames 1...7, and Enable for frames 8...10. So if this is possible, I don't think that jumpers would be involved. It might be possible to find the two or three tabs on the plug part of the MCB that are for power, hook power to them, then program while communicating via the Ethernet or serial ports. But without an adapter made for that purpose, I would be really warry of trying that. Again, if anyone else knows of a safe and effective method of doing this, please jump into the thread.  @VFD Guy, you ever hear of this? Question for @MTPControl; Why do you need to configure the MCB outside of the drive?
  23. Powerflex 755

    Not that I'm aware of. The main control board (MCB) is plugged into and powered through the backplane. I don't know of any safe means of attempting to power the MCB inside or outside of the drive without line power applied to the drive. If anyone else has a method for this, I'd like to hear it. If you have drive tools software, such as Drive Executive of Connected Components Workbench, you can configure your drive offline and then download the project to the drive once you're ready for power. If you're using ControlLogix, you can configure the drive in Studio5000 and once all the power and networks are up and running, the controller will take over the drive for you.  
  24. "No Project" displayed on the PLC

    This means that you have an L7 or L8 controller with the digital, scrolling display, and that display is currently saying "No Project". If so, you are correct that the controller literally has no project. This happens only under a few conditions: You have purchased a new controller that has never had a project downloaded to it. For a few moments when performing a download. (One of the first download steps is deleting the current project), When the controller has a major non-recoverable fault. Is there also a red fault light activated on the front of the controller? If so, this means the controller experienced a major non-recoverable fault, and has cleared its own project. This is generally considered a hardware failure and as often as not means the controller will need to be replaced. You can try downloading a project to the controller and see if it starts running normally. If it doesn't, you may try to flash the firmware on the controller and then download. And if that doesn't work, replace the controller. 
  25. PF527 Bus undervoltage user limit

    Thanks @VFD Guy! I've never needed to adjust or even look at those settings in an AC drive and only knew (as I said) that most drives don't allow it. Point of interest: though DC drives are a bit of dying art, the Allen Bradley PowerFlex DC drive allow line voltage max/min threshold settings as part of its normal parameters settings.