LGT_CTL1: Lighting control 1,constant lighting control

Block LGT_CTL (FB821) calculates the lighting value for the actuator (positioning value). Also provides the status for achieved minimum lighting value and brightness state.

Functioning

The block calculates the lighting value:

Step	IF	THEN
1	[Brgt] > [SpBrgt] or [Brgt] < [SpBrgt]	[LgtVal] = [LgtCmdPrgsVal] - [StepVal] oder [LgtVal] = [LgtCmdPrgsVal] + [StepVal]
2	[LgtVal] < [LgtCmdCtlMin] or [LgtVal] > [LgtCmdCtlMax]	[LgtVal] = [LgtCmdCtlMin] or [LgtVal] = [LgtCmdCtlMax]
3	[LgtVal] < [LgtCmdActMin] or [LgtVal] > [LgtCmdActMax]	[LgtVal] = [LgtCmdActMin] or [LgtVal] = [LgtCmdActMax]

The block calculates status:

Step	IF	THEN
1	[LgtVal] <= [LgtCmdTshVal] +[LgtCmdActlMin]	[LgtValMinRd] = 1
2	[Brgt] >= [SpBrgt]+0.5*[HysBrgtCtl]	[BrgtSta] = 1

Input values

Pin	Description	Data type	Standard value	Engineering unit or text group	Min.	Max.
Brgt	Brightness	REAL	0.0	lx	0.0	3.40E38
SpBrgt	Brightness setpoint	REAL	500.0	lx	0.0	3.40E38
HysBrgtCtl	Hysteresis brightness control.	REAL	100.0	lx	0.0	3.40E38
LgtCmdPrgsVal	Lighting command progress value	REAL	1.0	%	0.0	100.0
LgtCmdActlMax	Lighting command maximum actual value	REAL	100.0	%	0.0	100.0
LgtCmdActlMin	Lighting command minimum actual value	REAL	1.0	%	0.0	100.0
LgtCmdCtlMax	Lighting command max. control value.	REAL	100.0	%	0.0	100.0
LgtCmdCtlMin	Lighting command min. control value.	REAL	1.0	%	0.0	100.0
StepVal	Step value	REAL	1.0	%	0.0	100.0
LgtCmdTshVal	Lighting command threshold value.	REAL	0.95	%	0.0	100.0

Output values

Pin	Description	Data type	Standard value	Engineering unit or text group	Min.	Max.
LgtVal	Lighting value.	REAL	0.0	%	0.0	100.0
LgtValMinRd	Minimum lighting value reached.	BOOL	0	False, True
BrgtSta	Brightness state.	BOOL	0	False, True	-3.40E38

Process response

Standard (see General rules and information).

Troubleshooting

Standard (see General rules and information).