Michael Lloyd

MrPLC Member
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About Michael Lloyd

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  • Birthday 06/01/58

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  • Gender Male
  • Location Texas
  • Country United States
  • Interests Photography, Flying, Electronics, Long Range Shooting, Reloading, Fishing, Hunting

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  1. Logix Tag-Based Alarms

    One other possibility is that a lot of us like what we've come up with. We don't use AB HMI software. We use Cygnet or ClearSCADA (although Schneider has done what they always do when they buy something and let ClearSCADA founder). I took a look at Plant Pax recently... that thing is a pig... 
  2. How would you interpret this CPT

    If that's the case, and I'm not misunderstanding, the FXNo would never go above 7 and that's not happening in real life and can't happen or 3/4 of the control system wouldn't work. _Fx is called from 14 different routines (some not used). The following is one of the calls that places 21 into the Input Parameter of the subroutine called _Fx. the input parameter is the tag FxNo JSR(_Fx,2,21,MstrDmd,IbdPosGas)  
  3. How would you interpret this CPT

    FxNo-1 AND 7 is the equation. FxNo MINUS 1 AND 7 Every time the pointer indexes something else is computed and read into and out of tables pointed to by FxNo (Function Number), I think.... FxTblStart is the pointer for the table. FxNo is the index for the desired calculation. I think... 
  4. How would you interpret this CPT

    Destination: FxTblStart ; this is an integer that is used as a pointer for some interesting array "stuff" (see PDF link below) Source: FxNo-1 AND 7 In this case FxNo = 20 20-1 = 19 AND 7? AND is a boolean statement. The CPT instructions say AND is a bitwise operator (because it is) so the intent is not to add 19 and 7 together. Fx17-24 (see the PDF), among other tags, is DataType REAL[8,2,16]. The arrays that I've used are x,y. BTW, This is from the boiler control program that I've bi... complained about for a few years. It came without documentation. In my spare time I've manage to document a large part of it. The routine is, I think, my final WTH thing to figure out. As much as I want to hate it there's a level of old school programming skill that's enviable (and irritating) in this thing. Before anyone jumps on the pulpit, yes, I'm very well versed in fired heater and boiler control as well as combustion. I've done it for 1/2 of my life. There is a simpler way to do what they did BUT I'm not going to rewrite the PLC program and HMI just because I don't understand what they did. I'd rather understand it than delete it. Here's a PDF of the routine: https://www.dropbox.com/s/nmt5pepvn8qr6l3/Fx.pdf?dl=0 The tags aren't documented. That's what I'm working on now. The HMI has two screens that references most of the tags. The first screen (below) shows 20: as selected. I'm trying to troubleshoot why the feedback for the FGR Damper position doesn't match the setpoint. Visibly it's in the correct position. It looks like there's characterization for the output and the feedback but until I understand what Fx is doing I'm not going to let the tech touch anything.   
  5. Micrologix 1100 Write to Modbus compressor

    I had to do something the align the neurons. LOL I'm up in NW NM. Ironically I've had a better quality of life here than my kids down in TX. NM does winter pretty well and in this part of NM it's not that harsh
  6. Micrologix 1100 Write to Modbus compressor

    Curious minds want to know what the problem was. I made the attached PDF to let my SCADA group know what the problem ended up being with a MODBUS ASCII problem (why... why is MODBUS ASCII even necessary in 2021?).  SLC PLC talking to a Fisher ROC. "Nothing had changed in either program", "I only looked at it, I didn't change anything". The clue came from decoding the Function Code returned. 131. It's not easy to see 131h in the attached PDF because of the ASCII protocol.  Page 2,3, and 4 are the useful bits in the attachment. The rest of it was from my spreadsheet. I guess attachments aren't allowed anymore so I'll go with a dropbox link instead https://www.dropbox.com/s/e9usj5u7qmq5m0m/MODBUS%20ASCII%20and%20RTU%20Decode.pdf?dl=0
  7. 1756-EN2T Anomalies

    Subnet mask? Default router address?
  8. opening .RSS file

    You didn't attach it correctly. It doesn't open. Use the Insert Other Media button
  9. 1756 ENBT/A Web Page Help Needed

    V17 is "vintage" :)  We started with ENBT/A's about 10 years ago and about a year into a 3 year long project with 53 PLC's, etc, blah blah the rep strongly suggested moving to EN2T's, which we did. It was a good move. The odd comm issues that were "fixed" by sending a tech out at 2am to unplug the ENBT and plug it back in vanished. Your CIP timeouts error growing situation tweaked a memory of diagnostic checks that I did trying to find the issue and I believe that was the same issue we could see but didn't know what to do to fix it other than pulling the card, wait x seconds, and plug it back in. Not a great plan...
  10. studio5000 FBE signal lines

    You can manage the lines by not having any. For instance, using a very simple example of a multiply block\ I created a Multiply block and called it X1. X1 tags are: X1.SourceA, X1SourceB, and X1.Dest In structured text I could do X1.SourceA := tag or value X1.SourceB := tag or value X1.Dest could be mapped to another tag or just use X1.Dest If you don't have Structured text use a MOV move a value to X1.SourceA and X1.SourceB Very crude example.   Here's a real life example of how I map tags to/from a liquid orifice plate calculation: // Liquid Orifice Flow Calculation FI2101.HW := Analog[30].PV; FI2101.Tf := 98.0; FI2101.D := 6.065; FI2101.Bore := 3.625; FI2101.Sg60 := .7813; FI2101.SgF := 0.7726; FI2101.ngpm := 5.667; FI2101.nbph := 8.096; FI2201.HW := Analog[37].PV; FI2201.Tf := 98.0; FI2201.D := 6.065; FI2201.Bore := 3.625; FI2201.Sg60 := .7813; FI2201.SgF := 0.7726; FI2201.ngpm := 5.667; FI2201.nbph := 8.096; The left side is the input to a function block.
  11. Can you do >= and <= and just use the OTE as time suggested?
  12. Two problems on two different computers

    Final resolution was to take my laptop off of the network. The FlexNet "issue" is only an issue when the laptop is in the WAN but I can't find any software or driver that's causing it. I also loaded version 31, some patches, and AOP's. Both computers work now. The desktop is on the network and the laptop isn't. I suppose I should try it on the network since I made the same changes to it. Maybe later :) 
  13. Two problems on two different computers

    You were very helpful Bob. You pointed me to the FlexNet problem. I didn't realize that it wasn't AB software. It looked odd to me. I didn't remember the server being called FlexNet, because it isn't, but for all I knew AB had changed it. I've attached what I think is the last piece of the puzzle. I don't know why "it worked and then it didn't" yesterday.  Note: I think I uploaded it. I can see the file but it popped an upload failed screen when I tried to upload (edit - Nope... no file uploaded. Standby. I'll put it in Dropbox and link it.
  14. Two problems on two different computers

    Once again it appears that posting on a forum will resolve problems For instance - the security key issue "fixed itself". Yesterday, post IT update, there were no Factory Talk service running. They were all gone. I left the laptop on and logged in over lunch. It logged out but things happen in the background. The laptop now has all of the services back and it recognizes my license dongle. No software installs were performed. I think the IT help desk was working behind the scenes. They knew there was a problem as of yesterday. It's not unusual for that to happen. (no longer working, read on) I think the AOP issue is simpler. I tried another group of AOP's. Bear in mind that I downloaded Gigabytes of AOP updates. This one is the most recent: RA1756ApexAnalog_Rel_4.02.26_Signed and I can now edit the RTD cards without crashing the software on the desktop And in the time it took to type this, the laptop "FlexNet" problem is back. When I could see my license files and I checked the server all it said was server. Now it says FlexNet and none of the software is authorized. I turned off the WiFi and shut the computer down. I'll get back on it tomorrow. 1/2 way there...
  15. Two problems on two different computers

    Deleting the RSH and RS? didn't fix it on the desktop. Programs used to work in both. They still open in older versions I just tried to reinstall with repair but there was no option to repair. I can't even reinstall over the top of V28. The strange thing is that the software works, just not with the RTD/TC card