drforsythe

MrPLC Member
  • Content count

    171
  • Joined

  • Last visited

Community Reputation

6 Neutral

About drforsythe

  • Rank
    Sparky

Contact Methods

  • Website URL http://
  • ICQ 0

Profile Information

  • Gender Male
  • Location Metro Detroit Area, Michigan
  • Country United States

Recent Profile Visitors

4071 profile views
  1. Control Panel Builder

    Welcome to the forum.  Please include some more details about yourself, your specific experience building panels and if you have pics that would be great.  Where are you located?
  2. network parameter fo A3A cpu

    I spent some time this morning looking at your program, but I cannot easily determine the mapping of the network devices to the internal memory devices of the PLC.  It would take some time to study the prints, the physical layout of the machine and the program in order to determine the network map.  That is something I could not do in the time I spent this morning.  I would recommend contacting the original machine builder or contact a Mitsubishi office and ask for someone who is familiar with the A series PLC.  I worked on stuff like this over 20 years ago.  The product has long ago been replaced by new PLCs, networks and software to program it all.  I am sorry I cannot help you.  Best of luck in your search.  
  3. network parameter fo A3A cpu

    Attach it to this thread.  I will do my best.  It has been many years...  
  4. Hello.  This topic is not controls-related, but I think I could learn something from the group.  In addition to being an electrical controls engineer, I am a medical first responder for the plant I work in.  It has been suggested that all first responders be easily identifiable by the plant and office staff in case of an emergency.  This request could easily get out of hand- nobody wants to wear a bright green t-shirt to work every day or a hard hat with strobe and light.  My question is this:  Do the first aid response personnel in your places of employment wear or carry anything that helps to identify their role?  If so, please share your experiences and images if you have any.  Silly or comical images are definitely accepted, as they may help to demonstrate what we DON'T want to do.  Thank you and stay healthy and safe!
  5. network parameter fo A3A cpu

    That is a good start, but it doesn't state which device(s) are used in the address ranges.  For instance, Melsecnet/mini can be tagged to X, Y, M, D... devices.  Your program should help us determine what devices were used.  
  6. network parameter fo A3A cpu

    I used to work for a company that sold Mitsubishi 20+ years ago and would have to regularly talk my customers through the setup of their Melsecnet networks.  They would upload a program using Medoc from a PLC that was configured with a GPP unit.  The GPP had tables to fill out for the network settings, but Medoc did not.  When they would download back to the PLC CPU, the network settings would be missing. All that being said, the biggest challenge was knowing what memory areas to read from and write to when setting up the mapping the physical inputs and outputs.  Some customers had well-documented prints that showed the real-world I/O and how it related to the virtual I/O.  Others were not so easy, and we would need to study their code for clues.  Do you have any such info?  Do your electrical prints have the information?  Or is your program documented to show which memory locations were used?  
  7. Starting my career

    If you can get a job in maintenance while you are working on your degree, it will show your employer and other potential employers you can manage work and school at the same time.  It can also show them you are willing to start in a position that will help you be a better engineer.  It will also give you a great perspective from the maintenance side of things.  Sometimes the biggest challenge is getting your foot in the door.  If you are a dedicated, intelligent, hard working person who is not afraid to take on new things, it will get noticed.  The big thing that could hinder you is if travel is an absolute requirement of the job.  Best of luck to you.
  8. How to make analog signal more stable?

    I am not familiar with your controller, but I would use an averaging, or filter command to reduce the fluctuations.  How much is the 0-10V signal changing?  Looking at your graph, the values on the Y-axis are only changing from a min of 73.07 to a max of 74.2.  That is a difference of 1.13.  That is if I read the scaling correctly.  I am not sure what units the X-Axis units are or how those values correspond to a 0-10V signal.
  9. 1756-EN2F

    Is it possible that the Dell managed switch is only allowing traffic from the original MAC address and not the new one?  
  10. Am I correct in reading that the system will repeat itself " until input X1 has been turned off" ?  If that is the case, then X1 would need to stay on for the entire time in order to set the output.  The sequence would abort and reset if X1 goes off at any time.  Or am I misunderstanding the requirement?
  11. After a power outage, Logix5561 lost the program?

    Please post which firmware is loaded into the CPU.  We had a similar issue with 5561 processors.  I believe we had version 16 installed.  It did not matter if the battery was new or not.  We could not find the source of the error.    We upgraded to a newer level and (knocking on wood) have not had the issue since.  
  12. We use a similar flowmeter from a competitor to E-H.  Instead of pulses, we use the analog 4-20mA output signal.  The analog signal is less prone to interference and lost counts.  Our recent machines communicate with the flowmeters over ethernet/IP & Modbus.
  13. tech connect follow up email

    I always leave feedback.  Most of the time it is positive.  I also leave written feedback whenever given the opportunity.  It allows me to express exactly what I liked and what was good but could use a little more attention.  The simple "Strongly Agree" to "Strongly Disagree" selections don't give opportunity for details.  My company pays a lot of money for the service, so I leave the feedback so they can become better.
  14. Force on the Project

    Monitor the tag database and scroll through the tags.  Look in the Force Mask column for values (0 or 1 for bits or numbers and text for numeric and string tags).  Unforced tags will have blanks in the Force Mask.  Forced tags will show a value in that column.
  15. Upgrading L6 Series to L7 ControlLogix

    I have had difficulties with motion instructions when moving from one processor and FW level and going to another.  I cannot recall the details of the FW level but I think it was 18 to 21.  I would suggest making a copy of your file, then opening that copy in Logix 5000.  Then open the controller properties and change the controller type and FW level.  Once the conversion is complete, you will be able to see if all of the code converted.   If you see 0 errors once the conversion is complete, you should be good.  IF USING MOTION commands, you may still have issues, but you will have to cautiously determine how you will validate the conversion.  On our system, it was obvious.  We couldn't run until we changed some code.  If I remember correctly, it just had to do with timing one of the commands.