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Product overview
2.4
Basic function principles
The high-precision KL3172 analog input terminals can measure two voltages (KL3132, KL3162, KL3172,
KL3182) or two currents (KL3142, KL3152) and display them with a resolution of 16 bits (65535 steps). High-
precision measurements are ensured through cyclic self-calibration.
By default, the inputs are switched as differential inputs. For terminals KL3132, KL3162, KL3172 and
KL3182, terminal point -E1 of the first channel can be switched to internal analog ground with bit R32.6
[} 50] of the feature register.
Specification
The specification values are valid after at least 30 minutes warm-up time. The self-calibration largely
compensates for internal drifts, but the internal reference (like any electronic component) is slightly
temperature dependent and must stabilize.
The channels of the KL31x2 are not electrically isolated. Note CommonMode effects.
Process data
Analog values are represented as follows:
Input signal
KL3142-0000
KL3152-0000
0 mA
4 mA
20 mA
20 mA
Input signal
KL3132-0000
-10 V
+10 V
Calculation
The terminal continuously records measured values and stores the raw values of its A/D converter in register
R0 [} 48] (RAM). After each acquisition of the analog signal, a correction is calculated using the
compensation and, if necessary, calibration values. This is followed by manufacturer and user scaling:
Y
= (X
+ B
) x A
A
ADC
A
A
Y
= ((X
+ B
) x A
) x (A
A
ADC
K
A
A
)
K
Y
= Y
x A
+ B
H
A
H
H
Y
= Y
x A
+ B
off
H
W
W
14
KL3162-0000
KL3172-0000
0 V
0 V
10 V
2 V
KL3182-0000
-2 V
+2 V
(1.0)
Manufacturer compensation (if calibration inactive)
/
(1.1)
Manufacturer compensation / calibration (if calibration activated)
GK
(1.2)
Manufacturer scaling
(1.3)
User scaling
Version: 2.6.0
KL3172-0500
KL3172-1000
0 V
0 V
500 mV
1 V
Value
dec
hex
0
0x0000
65535
0xFFFF
Value
dec
hex
-32768
0x8000
+32767 0x7FFF
KL31x2/KS31x2
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