geniusintraining
Lifetime Supporting Member + Moderator
Hello all,
I just don’t get it…
I am having issues with this, I have found the problem but…I still need to learn what is happening
I 21.2 is the upper level detector
I 21.3 is the lower level detector
Q 7.2 is the request to the other PLC to enable the pump
I think F 1.5 is control voltage
F 40.4….I have no idea… e-stop maybe? but whatever
What its doing is controlling the level of a tank, I lost the lower level detector it over flowed onto the ground (300-400 gals)
I don’t want that to happen again (the fix is easy, I will add another Hi/Hi level indicator and that will stop this from happening), but this logic is working and works good for level control …but I still need to learn the logic
I understand that it changes state of Q 7.2 and toggles the output by changing state, set and resets the output, but…if 21.2 is NC and it’s the upper level, then its will be high when fluid is not present and 21.3 will be high when fluid is present…that’s *** backwards? Am I missing something? From what I can tell all is wired NO in the real world, are the German descriptors wrong?
I just don’t get it…
I am having issues with this, I have found the problem but…I still need to learn what is happening
I 21.2 is the upper level detector
I 21.3 is the lower level detector
Q 7.2 is the request to the other PLC to enable the pump
I think F 1.5 is control voltage
F 40.4….I have no idea… e-stop maybe? but whatever
What its doing is controlling the level of a tank, I lost the lower level detector it over flowed onto the ground (300-400 gals)
I don’t want that to happen again (the fix is easy, I will add another Hi/Hi level indicator and that will stop this from happening), but this logic is working and works good for level control …but I still need to learn the logic
I understand that it changes state of Q 7.2 and toggles the output by changing state, set and resets the output, but…if 21.2 is NC and it’s the upper level, then its will be high when fluid is not present and 21.3 will be high when fluid is present…that’s *** backwards? Am I missing something? From what I can tell all is wired NO in the real world, are the German descriptors wrong?