Count welds

[ateist75]

Hi all!
I would like to count the number of arc ignitions in a weld cycle and compare it to a num reg with the correct number of welds. I have a DI that shows that a weld is started (ARC ignition confirmed).
We have had some problems with operators that starts the program in the wrong line after they have been changing weld nozzle for example.
And in some cases they have skipped a weld without noticing.

So, how is the best way to do this?  I appreciate all help!  

[prnuk2003]

Set up a TRAP connected to the digital input to increment a num data for each weld. Each 'part' will have a different number of welds per cycle so compare them after the cycle is complete - if its different then generate a warning, otherwise reset the num data to zero

[ateist75]

Set up a TRAP connected to the digital input to increment a num data for each weld. Each 'part' will have a different number of welds per cycle so compare them after the cycle is complete - if its different then generate a warning, otherwise reset the num data to zero

Thanks! I have never used the trap function, i have to read a little bit i think. But now i know where to start. 

[ateist75]

Actually, if someone could show a example of trap programming (and maybe use my ARC established input in the example) i would appreciate it.
I made som tryes yesterday but i am uncertain how the trap routine should be programmed.

[prnuk2003]

Quick example of a TRAP.
Use nCount after each cycle and reset it befor the next. 

MODULE WELD_CNT(SYSMODULE)
    !************************************
    PERS NUM nCount:=0;
    VAR intnum Monitor;
   
    PROC Init_Monitor()
      ! Insert this routine in Main for example
      IDelete Monitor;
      CONNECT Monitor WITH tExample;
      ISignalDI diArc_OK,high,Monitor;
    ENDPROC
   
   
    TRAP tExample
      Incr nCount;
    ENDTRAP

  ENDMODULE

[ateist75]

Thank you verry much, now it is crystal clear. trap funcionality opens up alot of possiblites for me. Should have used it a long tima ago 

[HWK0329]

Another easy way, is to echo the start to the PLC and let the PLC handle everything. This way they can stop the clamps from opening or letting the operator take the part out without it being welded all the way.

[ateist75]

Another easy way, is to echo the start to the PLC and let the PLC handle everything. This way they can stop the clamps from opening or letting the operator take the part out without it being welded all the way.

Yes, that was my first plan. But we dont have external  PLCs on all our weld cells so the trap solution is possible to implement faster and cheaper.