Chapter - Continuous Control
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Chapter - Continuous Control. Examples. A Feedback Controller. Continuous Feedback - Logical Output. Ladder Logic Example. Block Diagram. An Example. Continuous Feedback and Output. Proportional Control Equations. Modeling Behavior with Differential Equations.

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PID CONTROL AND STATUS BITS

pid.CTL:DINT

pid.EN:BOOL - the PID function is enabled and running

pid.PVT:BOOL -

pid.DOE:BOOL - 0=d/dtPV; 1=d/dtError

pid.SWM:BOOL - 0 = automatic, 1 = manual

pid.MO:BOOL

pid.PE:BOOL - 0=independent PID eqn; 1=dependent

pid.NDF:BOOL - 0=no derivative smoothing; 1=derivative smoothing

pid.NOBC:BOOL - 0=no bias calculation, 1=yes

pid.NOZC:BOOL - 0=no zero crossing calculation; 1=yes

pid.INI:BOOL - 0=not initialized; 1=initialized

pid.SPOR:BOOL - 0=setpoint not out of range, 1=within

pid.OLL:BOOL - 0=above minimum CV limit; 1=outside

pid.OLH:BOOL - 0=below maximum CV limit; 1=inside

pid.EWD:BOOL - 0=error outside deadband; 1=error inside

pid.DVNA:BOOL - 0=ok; 1=Error is below lower limit

pid.DVPA:BOOL - 0=ok; 1=Error is above upper limit

pid.PVLA:BOOL - 0=ok; 1=PV is below lower limit

pid.PVHA:BOOL - 0=ok; 1=PV is above upper limit


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pid.SP:REAL – setpoint

pid.KP:REAL - proportional gain

pid.KI:REAL - integral gain

pid.KD:REAL - derivative gain

pid.BIAS:REAL - feed forward bias

pid.MAXS:REAL - maximum scaling

pid.MINS:REAL - minimum scaling

pid.DB:REAL - deadband

pid.SO:REAL - set output percentage

pid.MAXO:REAL - maximum output limit percentage

pid.MINO:REAL - minimum output limit percentage

pid.UPD:REAL - loop update time in seconds

pid.PV:REAL - scaled PV value

pid.ERR:REAL - scaled Error value

pid.OUT:REAL - scaled output value

pid.PVH:REAL - process variable high alarm

pid.PVL:REAL - process variable low alarm

pid.DVP:REAL - positive deviation alarm

pid.DVN:REAL - negative deviation alarm

pid.PVDB:REAL - process variable deadband alarm

pid.DVDB:REAL - error alarm deadband

pid.MAXI:REAL - maximum PV value

pid.MINI:REAL - minimum PV value

pid.TIE:REAL - tieback value for manual control

pid.MAXCV:REAL - maximum CV value

pid.MINCV:REAL - minimum CV value

pid.MINTIE:REAL - maximum tieback value

pid.MAXTIE:REAL - minimum tieback value

pid.DATA:REAL[17] - temporary and workspace (e.g. integration sums)‏

PID

CONTROL

REALS


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