need help one more time

hidroela · Oct 14, 2004

This time I need help with this one
There is two limit switch an I want to measurement the time
From when the first limit switch is closed to when the second
limit switch is open

panic mode · Oct 14, 2004

XIC I:1.0/0 XIO I:1.0/1 BST TON T4:0 0.001 19999 0 NXB MOV T4:0.ACC N7:0 BND

hidroela · Oct 14, 2004

Sorry but this is to much for me

I don’t understand in this way

BST ????? ,NXB ????

i just get this from the help file inrslogic5
Branch structures on rungs consist of a minimum of three instructions: BST, NXB and BND. These correspond to Branch Start, Next Branch and Branch End. Using branch instruction mnemonics is only necessary when creating branched rungs in the Rung Edit Buffer or when editing .PC5 files.
The BND instruction must always be preceded by at least one pair of BST/NXB's. A BND must be present for each preceding BST mnemonic. For example, a complete rung with parallel branched outputs would appear as:

SOR XIO I:001/00 BST OTE O:000/00 NXB OTE O:000/01 BND EOR

but I am still lost

Terry Woods · Oct 14, 2004

hidroela,

Your drawing is not very clear...

Are the limit switches more than a truck length apart?

Is it possible for both switches to be tripped at the same time?

hidroela · Oct 14, 2004

yes they are more than a truck apart

no they would no be tripped at the same time

g.robert · Oct 14, 2004

I am not at the office so I can't provide example. I believe you could use just one timer and use the input from the limit switch like a traditional stop start. Use normally close from LS 2 and normally open from LS 1. You would need holding bit off timer.

Momentary signal from LS 1 would start (the switch would have to release prior to reaching LS 2) ans LS 2 would stop. Even if the LS 1 is held closed the entire travel you could use latching bit to accomplish task. IMHO this would be a much cleaner program.

Terry Woods · Oct 14, 2004

While I'm waiting for your reply...

The process is as simple as you stated...

When Limit Switch-1 goes ON... start a timer.

When Limit Switch-2 goes OFF... grab the time and disable the timer.

OK, I see your reply... what I said above applies.

Here is a very simplified code...



               +--------+

   LS2         |  Copy  |

---|\/|--------+  Time  +------(    ) RST & DISABLE TMR

               |  some  |

               |  where |

               +--------+



             RST

   LS1       TMR   

---|/\|--+---|/|------(    ) RUN TMR

         |

   RUN   |

   TMR   |

---| |---+







   RUN

   TMR

---| |-----|  TIMER  |---(   )

hidroela · Oct 14, 2004

panic mode

I am not sure but that’s what you imply

$~hidroela\chico.jpg$

hidroela · Oct 14, 2004

Terry Woods

-|\/|- what that symbol mean

Terry Woods · Oct 14, 2004

---|\/|-- means Transition from ON-to-OFF

---|/\|-- means Transition from OFF-to-ON

If you don't have this function available, there are simple ways to create it.

In your last visual...

If I:001(0) represents Limit Switch-1 and...
I:001(1) represents Limit Switch-2 then...

You are running the timer and repeatedly saving the accumulated time until Limit Switch-1 goes OFF. Then you no longer run the timer nor do you grab accumulated time. Not good.

Try this...





     LS2

----|\/|---------------(   ) RST TMR







                RST

    LS1         TMR

----| |---+-----|/|------(   ) RUN TMR

          |

    RUN   |

    TMR   |

----| |---+



    RUN

    TMR

----| |----------+--------|  TIMER  |---+----(   )

                 |                      |

                 |                      |

                 +--------|   MOV   |---+

This will begin moving the accumulated time as soon as LS-1 goes ON and continue to do so until LS-2 GOES OFF.

LS-2 can not GO OFF until it has first gone ON.

Terry Woods · Oct 14, 2004

BTW, this will probably need switch debouncers.

Terry Woods · Oct 14, 2004

Soooo....????

hidroela · Oct 14, 2004

So Terry Woods I should implement some thing like this

$~hidroela\LAST.jpg$

Thanks all you Guys for your help

Terry Woods · Oct 14, 2004

In your line 0000 the timer is Reset before the time starts.

Since the truck is NOT at Limit Switch-2 when it IS at Limit Switch-1, your RESET TIMER will be asserted at the time that Limit Switch-1 comes ON!

All the time that Limit Switch-2 is NOT ON your timer is being DISABLED!

You are looking at the STATE of the switch... not the ACTION!

If you do not have a Transition detector then try this...



               WAS

    LS2        LS2

----| |--------|/|----+----( SET ) WAS LS2

                      |

                      +----(     ) LS2 OFF-to-ON  ...This is equivalent to ---|/\|---

 

               WAS

    LS2        LS2

----|/|--------| |----+----( RST ) WAS LS2

                      |

                      +----(     ) LS2 ON-to-OFF  ...This is equivalent to ---|\/|---

Hey... not fair... you editied your previous code after I read it... didn't you?

Now I have to look at your new code...

Your new code is confusing and complicated.

Rube · Oct 14, 2004

If I understand what you're trying to do this should work:

need help one more time

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