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Operation Using a Programmable Logic Controller (PLC)
Operation
Operation
Operation Flow
Flow
Flow Charts
Charts
Charts
Purge
Purge
Purge Mode
Mode
Mode Sequence
Sequence
Sequence
YES
YES
YES
YES
NO
NO
NO
NO
Purge A System Command
Write ‘6’ to Input Re gis te r 00
Is system in Standby or
Pumps Of f?
Is solvent flow switch 1 ON?
Purge time expired?
System Mode = Standby: Mix Not Ready
(Output Register 00 = ‘19’)
System closes component
A s olve nt va lve a t re mote s ta ck.
Purge no flow timeout expired?
No solvent flow detected.
Generate alarm.
System Mode = Purge A
(Output Register 00 = ‘13’)
System opens component
A s olve nt va lve a t re mote s ta ck
to allow solvent flow through mix manifold and out gun.
Purge time set according to the purge sequence assigned
to material A in re cipe .
No action taken.
Either pumps are currently
running or an alarm condition
exists.
NOTE: Purge B, C, and D
command works similarly
with solvent flow switch
2, 3, and 4.
3A6287E
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