SOME COMMON TERMS
ATL = air to load
ATU = air to unload
ATC = air to close
ATO = air to open
FC = fail close
FO = fail open
NC = normally closed
NO = normally open
cut in = to start functioning when operating parameter falls below lower limit
cut out = to stop functioning when operating parameter raises above upper limit

DIGITAL LOGICS
under-construction

INTERGRATED CIRCUIT (IC)
under-construction

PROGRAMMABLE LOGIC CONTROLLER (PLC)
under-construction

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