Beckhoff KL4494, Manual

Page: 9 / 40

Product overview
KL4494 9 Version: 2.0.0
Neither user nor manufacturer scaling is active
Y
a
= (B
a
+ X
ADC
) x A
a
(1.0)
Y
out
= Y
a
Manufacturer scaling active (default setting)
Y
1
= B
h
+ A
h
x Y
a
(1.1)
Y
out
= Y
1
User scaling active
Y
2
= B
w
+ A
w
x Y
a
(1.2)
Y
out
= Y
2
Manufacturer and user scaling active
Y
1
= B
h
+ A
h
x Y
a
(1.3)
Y
2
= B
w
+ A
w
x Y
1
(1.4)
Y
out
= Y
2
Key
X
adc
: Output values of the A/D converter
Y
out
: Process data to PLC
B
a
, A
a
: Manufacturer gain and offset compensation
( R17 [
}
33] , R18 [
}
33] )
B
h
, A
h
: Manufacturer scaling (Not implemented)
B
w
, A
w
: User scaling
( R33 [
}
34] , R34 [
}
35] )
The equations of the straight line are activated via register R32.
Analog output channels
The analog output channels of the KL4494 generate signals in the range from -10 V to +10 V with a
resolution of 12 bits (4095 steps). The outputs are single-ended outputs with a common ground potential.
Format of the output values
In the delivery state the process data are shown in two's complement form ( -1
integer
corresponds to 0xFFFF).
Siemens output format [
}
34] can be selected via the feature register R32 as an alternative.
Output value Output voltage
hexadecimal decimal
0x8000 -32768 -10 V
0xC001 -16383 -5 V
0x0000 0 0 V
0x3FFF 16383 +5 V
0x7FFF 32767 +10 V
Process data equations
The process data, which are transferred to the Bus Terminal, are calculated based on the following
equations:
Neither user nor manufacturer scaling is active
Y
dac
= X x A
a
+ B
a
(1.0)