23 lines
772 B
Markdown
23 lines
772 B
Markdown
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##### The idea is to use:
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***
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* X26 : Q2 is doing changeover EMD
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* X27 : Q3 is doing changeover EMD
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On Q1 DB1.X26 == DB1.DBX301.2
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On Q1 DB1.X27 == DB1.DBX301.3
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On Q1 DB1.X28 == DB1.DB301.4
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So in this case using priority:
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***
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* Q1 can always change format because the AIR is taken from ALPLA
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* Q2 can always start the change and will not pause.
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* When Q2 is changing is set the X26 bit
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* Q3 must wait until X26 signal is off to start the changeover
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* If Q3 is doing the changeover and the X26 bit is set, then must pause until X26 is clear
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* When Q3 is changing is set the X27 bit
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* Q4 must wait until X26 and X27 signal is off to start the changeover
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* If Q4 is doing the changeover and the X26 or X27 bit is set, then must pause until X26 and X27 are cleared.
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