markn

MrPLC Member
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About markn

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  • Country United States
  1. CMP instruction

    Gambit, Thanks for the reply. I have found and studied the instruction and understand how it works. I enter [ CMP C235 K500 M0] and i get an error.   I'll try again. maybe a typo
  2. CMP instruction

    Hi Guys How do I enter a comparison instruction in GX Developer v8  thanks
  3. Hello All I have a machine down, the PLC is Modicon, the HMI is through a PC. I suspect the issue is with the PLC. Is anyone located in SE Michigan that can come out an help me troubleshoot? Thanks
  4. Mitsubishi FMOV instruction

    Hello, I am a beginner and am having trouble entering FMOV into the program. When I pick the instruction, a window pops up, I fill in Fmov space K0 space do space k4, press enter, the result is an error window. What am I doing wrong? Thanks
  5. SLC5/01

    Hi Guys, Thanks for the advice. I was able to find someone local to go online to reset the processor, turns out the OEM had not put and arc suppression on the relay coils and the resulting noise was scrambling the memory on the SLC5.
  6. SLC5/01

    Hi Ken, Is there any other way to communicate to the SLC, I have an older PC with a serial port. Thanks
  7. Hello Everyone, We have a machine with a SLC 5 plc, the machine is down with CPU Fault light flashing. I can turn on the motor and see input LED lights indicating buttons pressed. But the machine will not cycle, the last time this occurred a local tech reset the CPU. Is there a way that I can do this? As the tech we had used is no longer around. Thanks
  8. Internal relay question

    Hi I am with Crossbow, SFC was much easier for me to learn and I am a total rookie.
  9. When to use STL programming?

    Hey Goody, I don't think I can enlighten anyone as I am obviously just starting out. I am learning on my own and really appreciate the sage feedback I am given through this forum. Anyways, I am using GX developer ver. 8 and what I have learned applies to creating a SFC program. When I first looked at using the SFC function, I wasn't able to enter any ladder functions, I finally stumbled upon the basics. First in creating a new project I checked the SFC function, click OK, this brings up the SFC Block discription, the first block I used a ladder function to energize the 1st state, enter first state discription and check type SFC, click OK , this brings up the SFC editing page. I finally figured out that by clicking on the state box would bring up a ladder type edit page on the right side of the screen which allows entering functions to perform for that particular state. Further on I stumbled upon using the transition functions. anyways sorry to be so long winded.
  10. When to use STL programming?

    Hello Folks, I had the Ah Ha experience this weekend. I have discovered how to use the GX developer to create or program using the SFC feature. I can now understand how to program each State and create a transition to another state. From what I can gather STL is created using either List or Ladder editors. Thank you all for your help.
  11. When to use STL programming?

    Hi Goody, I think I am confused over the difference in STL and SFC, the manual I have only refers to SFC. I can't seem to get past entering the first block. Could you explain how to begin a program using SFC? Markn
  12. When to use STL programming?

    Hi Craig, It would be great to see some examples.
  13. Toggle bit

    Hi Speakerman, You've got the basic idead, however the saw travels and the workpiece is stationary, optionally the workpiece is bored for dowels after being sawn. I,ve actually got the limit switch to toggle an output using the ALT command. I've setup a FX1s-10mr on a bench and am testing my logic as I go. I' using the ALT command in conjunction with a P input and a F input when the saw returns to home position. I,m outputing to a M relay and I think I'll use that as a control bit as well as a control to release the clamp. One thing that I am having a problem figuring out is to insure that the M relay is in the proper phase upon starting the Machine and FX1s. The way the anti_tiedown works, is that the operator must operator must activate both controls within an aloted time, in our case about 500 milliseconds, and it is set up so that the operator must maintain contact inorder for the machine to cycle. There is also an onboard emergency circuit that returns everthing to home position and brakes the saw rotation upon activation. If I can figure out how I will post the code that i have started. Thanks
  14. When to use STL programming?

    Hi Goody, Thanks for the illustration, I'm with you on the ease of understanding. The problem I am having is inputing the info using GX developer. I have started a new program with the STL method checked off, and GX open with what appears to be a STL type chart, so I click on the first box(which I assume is a state), everything is ok till I try to program the Ladder diagram, input an NO contact the when I go to program an output I get an error which reads something like" wrong format or cannot perform a move from this contact. Thanks,
  15. Toggle bit

    Hi Speakerman, Thanks for the reply, I like the control bit-manual operation idea. I,ll try to expand upon what I am trying to achieve. We have an old double mitre saw which has its own hardwired PLC. To operate the saw as it is presently functioning, the operator places the piece upon the table and presses a foot pedal to begin the cut cycle, the saw then clamps the piece and the saw cycles through the cut, returns to the home position and releases the clamp. We would like to use the existing PLC logic to operate the saw, however, we want to add in an anti tie down feature, so that the exisitng foot pedal would operate the clamp only. Upon clamping the piece, the operator would have to insert his finger of each hand into a Banner OSB sensor to start the cut cycle. I,ve worked out the logic for the anti-tie down feature, but I am having trouble with the logic to replace the exisitng footpedal_start_cycle. My thought was to use the existing signal that the foot_pedal switch now sends to the machines' existing PLC. Something like this: Saw down; (signal from exisitng limit switch) O K to clamp Clamp ;signal from foot switch Start cut cycle ;signal from anti-tie down to existing foot switch input Regards