Timer

snorky · Apr 10, 2005

Hello all,
I am trying to replace an old eberly plc in our starch kitchen.
Got most of it sorted today but am struggling with a timer.
The agitate cycle needs to change from summer to winter via input from a switch.
Output to be on for 10 mins then off for 30 mins for summer and on 15mins then off 30 for winter. I have a switch on a panel that brings on an input for timed agitate but cannot get my head round how to do the timer.
I am useing RSLogix 500 on a MicroLogix 1200.
It used to be done with an old timer fixed to a relay base in the pannel but it must be possible with the plc.
Cheers
Snorky

bernie_carlton · Apr 10, 2005

Assume SWITCH is ON in Summer, T4:0 is the Agitate ON timer



 

     SWITCH                  +---------------+

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

                             | 600           |

                             | T4:0.PRE      |

                             +---------------+

     SWITCH

 ------|\|-------------------+---------------+

                             | MOV           |

                             | 900           |

                             | T4:0.PRE      |

                             +---------------+

snorky · Apr 10, 2005

timer

Bernie
Thanks for the reply.
Will this keep cycling as long as the input summer/winter is high and the timed agitate input is on.
It needs to come on for a given time then go off for a given time continusily whilst the timed agitate input is on. The time differences change depending on summer/winter
Sorry if I did not make this clear.
Cheers
Snorky

bernie_carlton · Apr 10, 2005

Set up T4:0 and T4:1 as 1 second timebase timers



 

 Agitate Input  T4:1/DN

 ----||----------|\|---+----+----------------+

                            | TON            |

                            | T4:0           |

                            | (Preset)       |

                            | (Current)      |

                            +----------------+                

 

    T4:0/TT                    Agitate

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

 

    T4:0/DN

 -----||-------------------+-----------------+

                           | TON             |

                           | T4:1            |

                           | 1800            |

                           | (Current)       |

                           +-----------------+

snorky · Apr 10, 2005

Bernie
Thankyou I think I got It.
Give it a whirl first thing.
Thanks
Snorky

Timer

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