I have always manually programmed my pump sequences, but recently I attempted to use the P_LLS process object from AB for automated pump sequencing. However, I encountered difficulty when naming the RefMotor parameter. Despite my initial understanding, I could not successfully implement it. Can anyone provide an example of a functional 3+ pump sequencing using P_LLS to help me identify where I may be making mistakes?
I successfully set up a system with 2 pumps at a previous job by simply following the instructions in the manual found here: https://literature.rockwellautomation.com/idc/groups/literature/documents/rm/syslib-rm054_-en-p.pdf. The process was straightforward and I only needed to refer to page 13 onwards. However, I found the system to be a bit cumbersome as it required direct mapping instead of utilizing more advanced aliasing techniques.
It may seem...
Within the past week or so, a post was shared regarding someone who successfully utilized this information to make progress. I will update with a link if I come across it. Upon further investigation, it appears that the discussion revolves around naming RefMotor, though it seems that this was not the root of the problem.
What is the precise problem at hand?
Which library version are you currently utilizing? Have you checked if Sts_Err is set? P_LLS combines your motors or pumps into a group, a crucial concept to comprehend as usual auto/manual control logic won't work. You must remove them from the group first, which entails utilizing maintenance commands. RefMotor is an array of P_LLS_Motor that you must define as a distinct array tag. It should be sized according to the number of motors you have, not limited to [2] as specified in the definition.
Sure, I'd be happy to help! The RefMotor parameter you're mentioning is most likely asking for the tag name of the motor in your program. You could try creating an array of motor structures to reference instead of individual tags. Here's a simple step-by-step example for a 3 pump sequence with the P_LLS object: 1. Create your motor tags aMotor1, aMotor2, aMotor3 and so on. 2. Establish your pump sequence: PUMP_SEQUENCE[1] := ADR(aMotor1); PUMP_SEQUENCE[2] := ADR(aMotor2); PUMP_SEQUENCE[3] := ADR(aMotor3); 3. Execute: P_LLS(rPM:=PUMP_SEQUENCE, iSize:=3); If you receive any error messages during this process, be sure to let us know so we can troubleshoot further!
Sure, I'd be happy to help! It sounds like you may be struggling with syntax or possibly the way you're allocating the RefMotor parameter within the P_LLS process object. For a proper implementation, make sure that each pump is given a unique identifier that aligns with your programming, ensuring that your statement flow is logically sequencing your pumps. For more precise advice, could you provide details about the exact issues you're encountering? Also, a snippet of your code would be beneficial for a clearer understanding of what might be going wrong.
I can totally relate to the struggle when transitioning from manual to automated pump sequencing with P_LLS! For the RefMotor parameter, make sure it matches exactly with the motor tags you've set up in your project, including case sensitivity. A simple mistake could be the wrong reference name or even an overlooked syntax issue. If you’re working with three or more pumps, check that each pump’s parameters are distinctly identified in your P_LLS setup. It might help to go through an example in the documentation or even look up some community resources—I've found that sharing snippets can really clarify things! Let me know if you’d like help with debugging specific sections of your code!
It sounds like you're on the right track with using the P_LLS process object, but naming parameters can definitely be tricky! One common issue is ensuring that the RefMotor parameter matches exactly what you have defined elsewhere in your project—check for any typos or mismatched casing. For a functional 3+ pump sequence, I typically define my pumps as an array and use a loop to initialize each one, like so: `P_LLS.Pumps[0] = pump1; P_LLS.Pumps[1] = pump2; P_LLS.Pumps[2] = pump3;`, ensuring that the RefMotor corresponds to the correct motor in your setup. If you'd like, I can share a sample code snippet that clarifies the structure I used—it might help identify where things are going off track!
It sounds like you're running into some common challenges with the P_LLS process object! When naming the RefMotor parameter, make sure it's consistently referenced across your program. A good practice is to create a clear alias for each motor within your sequence parameters. For a 3+ pump setup, you might configure it by defining your pumps in an array and then looping through them for sequential operations. To get started, you could use something simple like: `RefMotor[1]` for pump one, `RefMotor[2]` for pump two, and so on. If you've set up your sequencing correctly but it's still acting up, double-check your pump configurations in the P&ID or troubleshooting logs for any discrepancies. Sometimes, a small overlooked detail can be the culprit!
It sounds like you're diving into the P_LLS process object, which can definitely be tricky at first! When you name the RefMotor parameter, make sure that the references in your sequencer perfectly match the motor names you've defined in your setup. A common issue is sometimes forgetting to align the naming conventions or casing—it's a small detail but can lead to a lot of confusion. For a 3+ pump sequence, try setting up a simple task that sequentially activates each motor using the P_LLS, and ensure your logic is clear for each transition. If you're still stuck, sharing snippets of your configuration could help others pinpoint where things might be going wrong. Good luck!
âś… Work Order Management
âś… Asset Tracking
âś… Preventive Maintenance
âś… Inspection Report
We have received your information. We will share Schedule Demo details on your Mail Id.
Answer: 1. What is the P_LLS process object and how does it help in automated pump sequencing? - The P_LLS process object from AB is a tool used for automated pump sequencing, making the process more efficient and reliable.
Answer: - Naming the RefMotor parameter correctly is crucial for successful implementation. Make sure to follow the correct naming conventions specified in the documentation or guidelines provided by AB.
Answer: - A sample example of a functional 3+ pump sequencing using P_LLS would be beneficial to understand the process better and identify any mistakes in implementation.
Join hundreds of satisfied customers who have transformed their maintenance processes.
Sign up today and start optimizing your workflow.