MrPLC Member
  • Content count

  • Joined

  • Last visited

Community Reputation

5 Neutral

1 Follower

About Jobbe9000

  • Rank

Profile Information

  • Country Denmark

Recent Profile Visitors

1162 profile views
  1. Hi Martin, You are able to use both the MAM, MAJ, MATC, and MAPC instructions to superimpose an axis which is already geared to another axis. If your application does not require to be able to run at different speeds, the MAM instruction set to a relative movement would probably be the simplest solution. If the application require to be able to run at different speeds, the MAPC would be the ideal solution. The virtual axis would be your master axis, and the conveyor would be your slave axis.  You could create a indexing profile in the motion analyzer which move the slave axis 1 unit per 1 master unit. Then when executing your MAPC you can pick a suitable master distance, and set your slave scaling to the distance detected by your sensor.
  2. Been searching for some info on this. I have not been able to find something that i think i really trustworthy yet... Only this sheet documenting execution times and memory usage for instructions up until Studio5000 V21.   I am not sure that this is the truth, but to me it looks like the instructions take up the same amount of memory. (still there is a difference in excecution time... and looks like ST is slower than ladder)  There are no memory usage in the structured text tab, for the instructions except the IF..THEN..ELSE statements in the bottom. (This is why i think the instructions take up the same amount of memory)   From what i read, the place where you will gain most memory, is by optimizing your tags... Etc. dont declare boolians, but instead declare either a DINT or an array of boolians. Rockwell 5K processors work in 32bit, so all tags you declare will minimum use 4 bytes.... 32 single bool's will use 32 * 4 bytes, where a single dint with 32 accesable bits will only use the 4 bytes. Now theese numbers above is only "theoretical", because apparently when using the newer versions of Studio5000, memory is also reserved for the tagname and tag description.. I did not know this untill i read it the other day, and i was really surprised with the tradeoff in memory you have to make, to be able to upload a full program with tagnames and comments.   Would be cool if anyone actually know the details, because it is kind of hard to find info on this.
  3. Motion Servo Axis

    You could trigger a MASR and a MAFR instruction before you trigger the MSO instruction. Make sure that the axis.ShutdownStatus is false and that the axis.AxisFault = 0 before you trigger either of the MSO instructions.   You should be able to see what caused the axis to fault in the axis log if you want to figure our why the axis faults.
  4. Motion Servo Axis

    No, you do not need to home it after the MSO. You can use another MRP instruction if you need the position to be a certain value once you enable the axis again.
  5. Motion Servo Axis

    Okay, i understand. The motor will try to keep it position as long as it is enabled, no matter what. There are ways to overcome a problem like this. The simplest way is to simply disable the drive after the MAM is done using the MSF instruction, and then enable the drive again after the welding is done. Instead of readjusting, the motor will then just coast.   
  6. Motion Servo Axis

    Yes, you can set up a trend with the .EN and .DN bits from the MRP instruction, and the .IP bit from the MAM instruction. If the .IP bit from the MAM instruction is set before both the .EN and .DN bits from the MRP, then the MRP instruction didnt finish before the MAM was started.
  7. Motion Servo Axis

    Hi djoey, By "Readjustment" do you mean that the servo moves twice, or that it moves in a "not expected" way ?   The only guess i have so far, is that the MRP instruction is not completed before you execute the MAM instruction. As Rockwell states in the manual  "The instruction execution MAY take multiple scans to execute because it requires multiple coarse updates to complete the request. The Done (.DN) bit is not set immediately, but only after the request is completed." That might explain why it only happens sometimes. To fix this, you could try to add 2 XIC after the MRP instruction with the MRP motion instruction .EN and .DN bits before the MAM instruction is triggered. I hope it will help you. Good luck.
  8. How is logic stored in S7 PLCs?

    Hi,   Take a look at point 2.4 in this PDF   Basicly ladder (LAD) and fuction blocks (FDB) will have an intermidiate compiling step during runtime into STL before compiled into machine code. Siemens SCL (ST) will be compiled directly into machine code, just like STL. This is changed with their newer PLC's 1200 & 1500.
  9. Hi Derreck,   The .PC and .DN bits are cleared in the "pre-scan" the next time you execute the motion instruction. This is intended as written in the help file for the MAM instruction. "The PC bit stays set until the rung makes a false-to-true transition." Like you mention yourself, using only the .PC bit might cause problems for a state machine if not properly handled.   What you can do is use the .EN bit together with the .PC bit. From the help instruction "The EN bit stays set until the process is complete and the rung goes false." The .EN bit will be reset when the rung with the MAM instruction is set to false, and when the MAM instruction is called once again, doing the before mentioned "false-to-true transition", the .PC bit will be reset before the .EN bit is set.   Some people also use the inverse of the .IP bit together with the .PC bit. This also works, 99% times.    
  10. ET200M configuration in unity pro v13.0

    Hi Maha, Take a look at this link In the video he is adding a EDS file to the DTM Library.... I bet you can proceed in the same way with your GSD file, as long as you select the profibus system instead of ther ethernet/ip system.
  11. I just used the text to columns in excel 2016, with just a "Space" as delimiter. and excel break is into 4 cells. Cell A1: XIC Cell B1: ? Cell C1: OTE Cell D1: seven_tags.0 Then dragged the lower right corner of cell D1 down to "seven_tags.7"   Then in Cell G1 i entered =A$1&" "&B$1&" "&C$1&" "&D1 and dragged cell G1 down to G8. This will solve your question about excel, but i dont think you are able to import it into logix again.   If you want to able to import your changes to logix, firstly try to export your routine with just " XIC ? OTE seven_tags.0" created in it, and open the export file in a text editor.. You will see that logix uses XML, Nice! This is the part you want to copy and modify: Copy this 7 times and increment the rung number and seven_tags.index.. Save your file and import the routine back into logix. You can use excel to create the syntaxes for you, in a simelar way as i did in the above explanation. XML should not care about whitespaces and new lines, so you can create the XML as "<Rung Number="0" Type="N"><Text><![CDATA[XIC(?)OTE(seven_tags.0);]]></Text></Rung>" and still be able to import it.   I hope it makes sense, and wish you the best of luck with your auto-generate project :)    
  12. State Machine Based PLC Logic Design

    Hi Madhura, There are a ton of different ways to implement state machines, and alot of compagnies use their own version. If you want to look at some lirerature, you could look at PackML. There is a lot of implementation guides and descriptions on the internet. BUT just be warned.... implementing PackML can be a huge task, and if you only need it for this one project i would suggest that you take look at the standard and take what you find usefull from it. PackML is maintained by OMAC, and the site AutomationML has made a pretty good implementation guide.
  13. Only thing that i can think of, (except if the cable is damaged) is the speed of the cylinders or one of them binding on something. Sometimes there are counter and adjustable throttle valves on theese. I know you have 1 second as discrepancy time which should allow for most binding in either one of the cylinders. Uneven cylinder movements might be the cause of this only happing "once in a while" But again... Same thing could a damaged cable :)   I am not sure that a diagnostic code is available, when you are using the dual channel conf on the input card... like it would when using the DCS block.    Finding periodic faults can be a hassle, but i am hoping you will figure it our! Happy troubleshooting :)  
  14. Hi Glenn, I havent tried this, so can't say that it will work for sure... But try to take a look at page 146, the assembly instance 100 is able to return some I/O words to you... Maybe you are able to setup in the drive, which words to return.. In that case it might be possible to get the analouge value that way.   Might be worth a shot
  15. Not able to establish DDE connection

    Okay, and you have recreated the topic PLC-C on the Windows Server ?