Midline Instruction S7-300 processor

[Rod_Hackney 2]

I have a processing line in one our facility that was programmed by a vendor. It has several midline output instructions used in the logic. (#) They have M addresses associated with it. As soon as the preceding logic prior to the midline output is true, it is my understanding a 1 is stored in that memory location. Do you have to repeat the (#) midline instruction wtih a INOTI instruction in front of it to place a 0 in the M location? Help files are not very clear on this issue. Any assistance is appreciated.

[Groo 7]

The midline coil is just a coil, if the preceding logic is true, the address associated with the coil is true, if its false the address is false. The logic after the midline continues as if it was not there. Change the view to STL and you will see how it works. So no, you don't need anything special to change it to zero, the logic will change it to zero when the logic becomes false, same as any other coil.

[Rod_Hackney 2]

Thanks, I will check the logic out with this in mind.