Operation Using a Programmable Logic Controller (PLC)
Purge
Purge
Purge Recipe
Recipe
Recipe Sequence
Sequence
Sequence
YES
NO
Purge Recipe
System Command
Write ‘11’ to Input Re gis te r 00
System Mode = Purge A, B, C, or D
(Output Register 00 = ‘13’, ‘14’, ‘15’,
or ‘16’)
System opens component solvent
valve at remote stack to allow
solvent flow through mix manifold(s)
and out gun.
Purge time set according to the
sequence assigned to current
phase, in recipe.
No action taken.
Either pumps are currently
running or an alarm condition
exists.
Is system in Standby
or Pumps Of f?
YES
NO
YES
System Mode = Standby : Mix
Not Ready
(Output Register 00 = ‘19’)
System closes all solvent valves
at remote stack(s).
Is solvent flow switch
1, 2, 3, or 4 ON?
Purge no flow timeout
expired?
NOTE: A, B, C,and D will
correspond to solvent flow
switch 1,2,3, and 4
respectively .
Purge phase time
expired?
YES
Is there another purge
phase?
NO
NO
No solvent flow detected.
Generate alarm.
NO
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