Siemens 440 manual P07782 Value y1 of DAC scaling, P07792 Value x2 of DAC scaling

Issue 01/06 Parameter Description

Note:

The DAC-linear characteristic is described by 4 coordinates, based on a two-point equation:

y - P0778 = P0780 − P0778 x - P0777 P0779 − P0777

For calculations the point-gradient form (offset and gradient) is more advantageous:

y = m ⋅ x + y0

The transformation between these two forms is given by:

m =	P0780 −	P0778	y0 =	P0778 ⋅ P0779	−	P0777 ⋅ P0780	≤
	P0779 −	P0777		P0779	−	P0777

200 %

For scaling of the input the value of y_max and x_min has to be determined. This is done by the following equations:

						y
						ymax
		P0780⋅ P0777 −		P0778⋅ P0779	P0780
	xmin =					y2
			P0780 −	P0778
					P0778
		(x max− x min) ⋅ P0780 − P0778				y1
	y max =					y0
			P0779 − P0777
						m			x
					xmin			xmax
						P0777	P0779
						x1		x2
P0778[2]	Value y1 of DAC scaling							Min:	0	Level
	CStat:		CUT	Datatype: Float		Unit: -		Def:	0	2
	P-Group:		TERMINAL	Active: first confirm		QuickComm.: No		Max:	20

Defines y1 of output characteristic.

Index:

P0778[0] : Analog output 1 (DAC 1)

P0778[1] : Analog output 2 (DAC 2)

P0779[2] Value x2 of DAC scaling					Min:	-99999.0	Level
	CStat:	CUT	Datatype: Float	Unit: %	Def:	100.0	2
	P-Group:	TERMINAL	Active: first confirm	QuickComm.: No	Max:	99999.0

Defines x2 of output characteristic in [%].

Index:

P0779[0] : Analog output 1 (DAC 1)

P0779[1] : Analog output 2 (DAC 2)

Dependency:

Affects P2000 to P2003 (referency frequency, voltage, current or torque) depending on which setpoint is to be generated.

P0780[2] Value y2 of DAC scaling				Min:	0
CStat:	CUT	Datatype: Float	Unit: -	Def:	20
P-Group:	TERMINAL	Active: first confirm	QuickComm.: No	Max:	20

Defines y2 of output characteristic.

Index:

P0780[0] : Analog output 1 (DAC 1)

P0780[1] : Analog output 2 (DAC 2)

Level

2

MICROMASTER 440	Parameter List
6SE6400-5BB00-0BP0	95