PcoValCon (FB)

FUNCTION_BLOCK PcoValCon

This function block is designed for controlling a control valve. The function block has build in a PID-controller, and software for Manual positioning.

InOut:

Scope	Name	Type	Initial	Comment
Input	SpExt	INT	0	1: External setpoint. Calculated setpoint or output from another PID controller (e.g. PCO_PIDCON) in a cascade control system.
	PV	INT	0	2: Process value (to be controlled). Process value obtained from the system
	Track	BOOL	FALSE	3: Tracking mode. PCO_VALVCON can be set in Tracking mode if Track = TRUE. Output of the controller will be set to TRACK_VALUE. (Track mode has higher priority compared to balancing mode). Track is independent of operation mode of PCO_VALVCON.
	TrackSp	INT	0	4: Tracking value. Output of the controller will be set to TrackSp if Track = TRUE
	Bal	BOOL	FALSE	5: Balancing mode. PCO_VALVCON can be set in Balancing mode if Bal = TRUE and Track = FALSE. Output of the controller will be set to BalSp. Bal is independent of operation mode of PCO_VALVCON.
	BalSp	INT	0	6: Balancing setpoint. Output of the controller will be set to BalSp if Bal = TRUE
	RevAct	BOOL	FALSE	7: RevAct = FALSE, controller will increase output if Setpoint is less than Process value. RevAct = TRUE, control- ler will decrease output if Setpoint is greater than Process value
	EnAuto	BOOL	TRUE	Enable auto operation of PID controller
	EnOpn	BOOL	TRUE	9: Enable valve to open
	EnCls	BOOL	TRUE	10: Enable valve to close
	ActPos	INT	0	11: Actual position of the valve Scaling 0-10000
	Opn	BOOL	FALSE	12: Valve is open
	Cls	BOOL	FALSE	13: Valve is closed
	Rdy	BOOL	TRUE	14: Valve is ready for operation. (Ready=FALSE results in external error)
	Remote	BOOL	TRUE	15: Valve can be controlled from OS (Remote=FALSE means local operation)
	InhibError	BOOL	FALSE	16: InhibError=TRUE : Suppress all alarm. InhibError=FALSE : No suppression
	Alarm1	BOOL	FALSE	17: Auxiliary alarm no. 1
	Alarm2	BOOL	FALSE	18: Auxiliary alarm no. 2
	Alarm3	BOOL	FALSE	19: Auxiliary alarm no. 3
	Alarm4	BOOL	FALSE	20: Auxiliary alarm no. 4
	Alarm5	BOOL	FALSE	21: Auxiliary alarm no. 5
	Alarm6	BOOL	FALSE	22: Auxiliary alarm no. 6
	RampTime	TIME	TIME#30s0ms	23: Actuator time. (from 0% to 100 % position)
	RampActive	BOOL	FALSE	24: RampActive= TRUE activates ramp under manual positioning.
Inout	Scada	PCO_VALVCON_TYPE		25: Structure variable for connection to Scada system
Output	Error	BOOL	FALSE	Operation continues with error. The output ErrorID gives more details about the error.
	Out	INT	0	1: Output from the controller (0-27648)
	OutMax	BOOL	FALSE	2: Output limited to the high value
	OutMin	BOOL	FALSE	3: Output limited to the low value
	ErrorID	ERROR_ID	ERROR_ID.NO_ERROR	4: Err number, Output provides an error identifier if an invalid value was applied to an input