DIN, Ladder Logic
Posted: Sun Aug 30, 2015 7:53 am
I have a Float Valve in my MLT. This is a DIN named “Float MLT”.
I have an Element in my MLT that is controlled by an Out name “MLTe”.
I have a valve for water flow that is a Out name “Fill MLT”
Process Start Water
State 0 => “Fill MLT”
Out “Fill MLT” asserted.
Exit Condition “Float MLT” asserted go to State 1 “Heat MLT”.
State 1 => “Heat MLT”
Out “ MLTe” under PID Control to 168 degrees.
Exit Condition none as I hold the MLT at 168 until I manually go to my next state.
State 2 => “Add Grain” …..
What I want is to have the following Logic in the Ladder Logic (or another method):
“Float MLT” must be asserted for Out “ MLTe” to work. I would want the “MLTe” to be PID controlled.
I put the “Float MLT” in the first Contact and the “ MLTe” in the Coil. This as expected causes the “MLTe” to assert as soon as the “Float MLT” is asserted.
What I am trying to do is shut the “ MLTe” off if the “Float MLT” is not made.
I have “destroyed” an Element when I got it out of water (adjusting water Temp manually by adding and draining water) and hope to find a method so that it will shut off when the Float is not made.
Can I do this? If so, how?
I have an Element in my MLT that is controlled by an Out name “MLTe”.
I have a valve for water flow that is a Out name “Fill MLT”
Process Start Water
State 0 => “Fill MLT”
Out “Fill MLT” asserted.
Exit Condition “Float MLT” asserted go to State 1 “Heat MLT”.
State 1 => “Heat MLT”
Out “ MLTe” under PID Control to 168 degrees.
Exit Condition none as I hold the MLT at 168 until I manually go to my next state.
State 2 => “Add Grain” …..
What I want is to have the following Logic in the Ladder Logic (or another method):
“Float MLT” must be asserted for Out “ MLTe” to work. I would want the “MLTe” to be PID controlled.
I put the “Float MLT” in the first Contact and the “ MLTe” in the Coil. This as expected causes the “MLTe” to assert as soon as the “Float MLT” is asserted.
What I am trying to do is shut the “ MLTe” off if the “Float MLT” is not made.
I have “destroyed” an Element when I got it out of water (adjusting water Temp manually by adding and draining water) and hope to find a method so that it will shut off when the Float is not made.
Can I do this? If so, how?