1756-HSC and PresentValue

[mechman02 0]

I have a need in my project to overwrite the PresentValue tag in my HSC card from the logic using a move instruction and the LoadPreset bit. I have been unable to do so thus far. Am I supposed to be able to do so? If so, what would prevent me? Thanks. Edited 23 Aug 2006 by mechman02

[TimWilborne 108]

Can you post what you have? Probably something simple

[Craig 0]

I am pretty sure you will not be able to load a value into the present value tag the load preset bit is for loading a preset value into a different register in you HSC when your presentvalue exceeds the presetvalue a bit is set. There are 4 modes you can operate the HSC in and with some wiring you can freeze and hold the presentvalue and then restart and or reset it counting again. But not move a value into it. Suggest you reset it when required then start the count again.

[Smoke 0]

You might want to look at these links. http://domino.automation.rockwell.com/appl...85?OpenDocument http://domino.automation.rockwell.com/appl...89?OpenDocument http://domino.automation.rockwell.com/appl...2B?OpenDocument http://domino.automation.rockwell.com/appl...DC?OpenDocument