Instrution GRT

dandrade · Dec 18, 2004

More quick reply, oposite get the manual.
One explanation GRT instrution this part.
Delete GRT change EQU, is worked?!

The Counter:



     PB         +---- CTU ---+

----| |---------| COUNTER    |

                | Preset:  2 |

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

 

      +----- EQU ---+          Out1

------| COUNTER.ACC |----------( )

      |          1  |

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



      +----- GRT ---+        COUNTER

------| COUNTER.ACC |---------[RES]

      |          1  |

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

rsdoran · Dec 18, 2004

What happens when it changes to 1 after it has scanned the EQU output rung?

The Counter is preset for 2, you could use EQU and set it at 2 for reset. I think GRT is used to cover any glitches..ie overcounts etc, its possible for counters, timers etc to go past their presets.

Ken Moore · Dec 18, 2004

I use the GRT instruction for hi speed applications, such as pulse inputs. Because if EQU is used you may miss the exact match.

example:
scan, register = 99
Scan, register =101

if EQU 100 was used the rung would miss the true condition.
so use GRT 99 instead, that way if next scan is 100 or 101 still evaluated as true.

Instrution GRT

dandrade

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rsdoran

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Ken Moore

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