![]() The first rung Resets the OnCondition bit. The output bit is not turned on for the next scan because when the ladder scans from the beginning, BitA is turned off by the ladder again and is still off when the rung in question is scanned. However, when the rung was scanned, the logic was NOT true and the bit is NOT on. Sysmac Studio can only show the status of the bits at the end of the scan as bits can change too fast during the scan to display this, so it looks like the coil should be on. When this rung is scanned, BitA is OFF, therefore the coil does not turn on.īitA is turned ON by ladder somewhere after this rung. It is difficult for me to see what the contacts are in your rung, but one (at least) of the three contacts in the lower branch of the rung does this (lets just call it BitA):īitA is turned OFF by the ladder code somewhere before this rung And why will it not become true on the next scan? I don't understand, if the logic is true, the output should be on regardless of scan time. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
December 2022
Categories |