gromit

MrPLC Member
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About gromit

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  1. PLC5 First-out logic

    Thanks pcmccartney1. At the end of the day I finally built and tested the first-out logic as solicited. The average program scan time is under 20 msec, which contributes to the successful operation of the first-out scheme. As mentioned, I fully tested it today with no errors. Tomorrow, we will be starting the skid/system and the first-out logic will be required to assist with identifying inputs which cause intermittent trips or shut downs. FIRSTOUT.pdf FIRSTOUT.RSP
  2. PLC5 First-out logic

    BobLfoot, I believe the latter is what I am looking for, whereby the first bit in a trip string latches in as the culprit that caused the trip...ergo first-out. thanks
  3. PLC5 First-out logic

    Does anyone have PLC5 First-out logic?
  4. FlexI/O RIO baud rate

    Reading through several publications, it appears that cycling power after changing the dip switch settings is the right course of action. Thanks.
  5. FlexI/O RIO baud rate

    After changing the Flex IO baud rate via the S2-3 and S2-4 dip switches, does the new baud rate automatically become active, or must the power be cycled on the Flex I/O adapter ? thanks
  6. PLC5 maximum of four timers acc strategy.

    Thanks Mickey... I couldn't figure out how to make the SRT--(Sort) instruction work. Please see the attached logic that works perfectly. MAX_ACC_DDS.pdf
  7. I have four timers used in my PLC5 program and want to capture the highest accumulated value of the four, much like the processor maximum scan time, where I can manually reset it. Is there a simple ladder logic scheme that can accomplish this with the PLC5 instruction set? Thanks.
  8. PLC5 floats to integers via modbus

    Thanks Mickey
  9. How can I marshall floating point files into integer files to be read by ModbusTCP link?
  10. I was able to create the 2nd order polynomial equation in Excel and used it in the CPT (Compute) instruction. Then, tested it and it works great. THANKS FOR THE ASSISTANCE!
  11. Thanks Michael, I plan to test it out tomorrow and hope the 5 breakpoints and the 2nd-order poly is accurate enough. much appreciated
  12. Thanks Mickey. Using the mycurvefit website, I was able to plot a 2nd order polynomial curve with five breakpoints, and then put the calculation into the CPT-compute instruction. Take a look at the pic, if you have time, and let me know if this is what you had in mind. Thanks!
  13. Thanks NevergoldMel. You are correct, the first curve was very linear, but this curve is more in line with actual characteristics. So, is there a way to create a poly in PLC5?
  14. How can I create a function generator or polynomial in PLC5/80? By this I mean I need a eleven point curve that changes the output based on the input. I do this all the time with DCS logic, but I don't see a "Polynomial" of "Function" block in RSLogix5. A simple curve might look like this. input        output     x1=    0    ...y1=    0 x2=    10    ...y2=    31 x3=    20    ...y3=    58 x4=    30    ...y4=    89 x5=    40    ...y5=    118 x6=    50    ...y6=    147 x7=    60    ...y7=    178 x8=    70    ...y8=    216 x9=    80    ...y9=    238 x10=90    ...y10=   269 x11=100    ...y11= 300
  15. How can I create a function generator or polynomial in PLC5/80? By this I mean I need a eleven point curve that changes the output based on the input. I do this all the time with DCS logic, but I don't see a "Polynomial" of "Function" block in RSLogix5. A simple curve might look like this. input   output   x1= 0 y1= 0 x2= 10 y2= 20 x3= 20 y3= 31 x4= 30 y4= 49 x5= 40 y5= 59 x6= 50 y6= 79 x7= 60 y7= 101 x8= 70 y8= 142 x9= 80 y9= 178 x10= 90 y10= 224 x11= 100 y11= 300