drforsythe

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About drforsythe

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  1. Can't alter program A series.

    Check for reads and writes using ANY input or output.  What I mean by that is, do a search for X0 and see if there are any reads associated with it.  They may have programmed it to read in whole words of inputs at a time and write that to an internal word (D0, for instance).  Post the program and rack layout if you are allowed.  I currently do not have the software installed, but depending on the format, may be able to get it installed.  Regarding the PC boards, it is possible they are converting the signals from DC to AC or PNP to NPN?  If you have prints, post them as well (if you are allowed).
  2. Studio 5000 EDS not registered in offline build

    Just a thought...  Are you running RSLinx and Logix as an administrator?  That has been a solution to EDS files not getting registered properly and not recognizing certain modules.
  3. A lot of people program that way.  I think the intent is to go back to put some "default" values in but they often don't go back to finish that step.   On another note- I used to work for a distributor of Mitsubishi.  I would commonly run into the problem where someone had uploaded their programs using Medoc to create their backups.  For small, simple machines this would work fine.  For PLCs that were programmed using the GPP units, we would often run into a problem where whole sections of machinery would not work.  The problem was that the GPPs had tables that could be filled out to configure their remote I/O networks.  Medoc did not have these tables, so when the program was uploaded, that data would not get uploaded.  Therefore, when the program was downloaded again, the remote I/O would not work.  For users of Medoc, the TO/FROM instructions needed to be added to the program in order to configure the network.  In this case, people thought they were doing the right thing and because of a large gap in functionality between Medoc and the GPPs, they would get hosed.
  4. Solenoid interlocks

    The circuit shown is a solenoid locking safety switch.  The arrow inside the circle denotes a positive break contact as IO_Rack stated.  The symbol is used to show that a device has contacts that are mechanically linked so that if they weld, the contacts will open when the actuator opens. (At least that is what is supposed to happen.)  This is most likely a gate switch that will show "closed and locked" when the gate is closed and the solenoid is on, which locks the gate or door shut.
  5. This is one of those topics where people are going to answer 'absolutely' based on their experience.  There is potential for high emotions and lots of cheerleading for or against certain manufacturers.  I will provide my viewpoint without really endorsing any one brand.  I have used all three brands. STRENGTHS - consider cost, availability of product and support personnel.  In my opinion, two of the three have decent software and one has always lagged.  All three offer world-class hardware and capabilities. WEAKNESSES - The biggest potential weaknesses from my viewpoint are cost and support with software a close third.  Geography has a lot to do with the support.  The best support for Mitsubishi is going to be in Asia, the best support for Siemens is going to be Europe and the best support for Allen Bradley is going to be North America.  (Don't get offended if you offer great support for one of those companies outside of the areas listed.  It is a general rule, not an absolute for EVERYONE who supports the products.)  Two of the above companies are GENERALLY more expensive than the other.  Two of the companies generally have better software than the third.  The company that doesn't have the best software has generally made up for that by making a nearly seamless upgrade path as hardware becomes obsolete.  The other two are quite as easy.  You figure it out.   OPPORTUNITIES - This is highly dependent on the industry being served.  Each of the three have their core industries that they serve and that is highly dependent on the location of the industry.  All three are in the steel industry and automotive industries, for example.  The main thing that has determined which of those companies are selected in those industries starts with location and the available inventory, support and software.   THREATS - Again, geography can come to play with all of these companies.  All of them have inventory in all major areas, but not all inventory. These three companies have huge presence in the world, but they don't have everything everywhere.  I have had issues with Mitsubishi and Siemens with lead times on replacement parts because I am in the metro Detroit area.  I have not typically had this issue with Allen Bradley.  I would think the same situation happens with any of the manufacturers if you are trying to source something away from any their "home" continent. I have purposely not answered your question specifically because there are so many variables.  Strenths, weaknesses, opportunities and threats are all dependent on the individual or company making the analysis as it relates to their particular situation and needs.  Each manufacturer provides claims that their product is easiest to use, has the fastest processor, the broadest instruction set, the most robust hardware.  They are all partially right because each one has their own unique measure of their claims that do not consider what the competitors claim.  Sorry to muddy the water.  All three companies make great products that can control most any process.  All three have broad offerings that all integrated within their families. I look forward to the responses to see how each fairs on a SWOT analysis. D
  6. In search of L33ER 200-800mA AO card/module

    Most of the time when I have seen these levels of current needed, it is for hydraulic control.  In those cases, the manufacturers provide the driver device and allow a voltage (-10 to +10v, 0-5v, 0-10v), current (0 to 20 or 4-20mA) or potentiometer input.   Is the Hawe directional valve drive motor an electric, hydraulic or pneumatic motor?
  7. ACD file to PDF

    Here you go. FRONT_PLC_MIR.pdf
  8. Ethernet Information

    It looks like you gave the part number for the mounting bracket for mounting a FLOW meter to a pipe.  Keyence makes a flow meter that does not require breaking into the pipe, but the bracket must be properly sized.  They have a flow meter that is ethernet/IP-capable that also accepts a PRESSURE switch input (a separate sensor) for sending flow and pressure.  Please clarify what exactly you have.
  9. Frozen Analog Input on Compact Logix

    I would be interested to know the model and manufacturer of the flow meter.  It is not unusual for 4-20mA devices to transmit outside of the 4-20mA boundaries if there is a problem with the sensor.  This is built-in to some models so your controller can tell if there is a problem with the sensor.  On some ultrasonic distance sensors we once used, you could select if the signal would go less than 4mA or higher than 20mA if the sensor failed its diagnostics.
  10. Utility Power at Night

    It is quite common for the utility companies to change the power delivered based on demand or power factor.  If you are in an area where you and your neighbors are using a lot of power during the daytime, but not so much at night, the power company will compensate for that.  The other thing that could be happening is that a plant in your area may have a new piece of equipment that is affecting your plant.  The best thing is to get a power analysis done for at least a week and including at least one weekend.  With the proper test reports, you could identify if the power is surging or sagging and if there is a harmonic component present.  The report would also show you times of the occurrences which will help you and the utility determine the cause of the issues.  Your report should include voltage, current, harmonic and power factor.  You can conduct these tests at the main source to your plant or in discrete locations, depending on the size of your plant or where the problems are.
  11. Input on the left vertical line

    Look into the MC and MCR commands.  Those are the Master Control and Master Control Reset commands.  They will essentially allow you to enable a whole block of logic that is contained between the MC and MCR. 
  12. RSlogix500, Stepper Motor

    As ControlsGirl stated, we will need to know the hardware to start.  Is there a PLC, or is the HMI connected directly to the stepper motor drives?  Please provide the info below: Manufacturer and model numbers for the PLC (if any), stepper motor drives, HMI.  Also, please describe the interconnection of these devices (serial, ethernet, DeviceNet, Profinet, digital I/O, etc.) Also, how are the commands sent to the stepper drives?  There could be several ways, such as direct (serial) commands from the hmi, pulses from a PLC, or index location via network or digital I/O command. Depending on the type of drive you have for the stepper motors, it could be fairly easy.  The more info you give on this forum, the better responses you will receive from the contributors.    
  13. Fork terminals for Mitsu PLS's

    Do a search for Thomas & Betts RA147PT.  Some people use these pin terminals.  Since the wire is inline with the pin, it will be offset from the row below it.
  14. We use Micro Motion flow meters throughout our plant.  They are great meters.  We have had issues with the old (>20 years old) devices after power failures.  I don't recall which model the old ones are, but we cannot even get them repaired reliably.  We have been systematically replacing the old units with the 5700 series transmitters.  They work with some of the old flow sensors, depending on the number of wires in the sensor.  I highly recommend contacting Emerson to find out who your local Micro Motion salesperson is.  They are really good to work with (at least in my experience).
  15. Autotuning Kinetix 350

    Unloaded motors are difficult to tune and will sometimes exhibit the problems you describe.  If I were you, I would try one of the following: Find a load for the motor.  It could be a plain gearbox with no load, or a pulley system.  It is best if you can create a geared ratio of at least 3:1.  The higher the ratio, the better results you will find when doing the autotune. If you can't find a load, then try to change the autotune parameters relating to the motion.  I am not near the software, so I can't tell you specifically what to change.  Start with the distance then change speed.  I have a feeling once you open up these settings, you may see a failure in the autotune.  Again, unloaded motors are hard to tune and that may show up if you try it with a longer move or higher speed.