BECKHOFF KL3102 - Manual (Page 6)

Description of functions
6 KL3102
Description of functions
The analog input terminal KL3102 processes signals within the range from-
10 to +10 V with a resolution of 16 bits (65535 increments). The inputs of
the KL3102 are differential inputs which share a common earth. As a result
the KL3102 is ideally suited to measuring earth free voltage drops. In the
standard version a filter is active with a stop frequency (64.5 dB) of 50 Hz.
The filter constant and with it connected the conversion time is adjustable
in wide areas.
Output format
of process data In the default setting, process data is represented in the twos complement
(-1 corresponds to 0xFFFF). By way of the feature register, other modes of
representation can be selected (e.g. signed amount representation,
Siemens output format).
Measured value Decimal output Hexadecimal output
-10V -32768 0x8000
-5V -16383 0xC001
0V 0 0x0000
5V 16383 0x3FFF
10V 32767 0x7FFF
LED display
The two RUN LEDs indicate the operating state of the affiliated terminal
channel.
RUN LED:
On – normal operation
Off – a watchdog-timer overflow has occurred. The green LEDs go off if no
process data is transferred by the bus coupler for 100 ms.
Process data The process data that is transferred to the bus coupler is calculated on the
basis of the following equations:
X_adc:
AD converter output values
Y_aus: Process data to the PLC
B_a,A_a: Manufacturer gain und offset adjustment (R17, R18)
B_h,A_h: Manufacturer scaling (R19, R20)
B_w,A_w: User scaling (R33, R34)
a) neither user nor manufacturer scaling active:
Y_a = (B_a+X_adc) * A_a
(1.0)
Y_aus = Y_a
b) Manufacturer scaling active: (default)
Y_1 = B_h + A_h * Y_a
(1.1)
Y_aus = Y_1
c) User scaling active:
Y_2 = B_w + A_w * Y_a
(1.2)
Y_aus = Y_2
d) Manufacturer and user scaling active:
Y_1 = B_h + A_h * Y_a
(1.3)
Y_2 = B_w + A_w * Y_1 (1.4)
Y_aus = Y_2
The straight-line equations are activated by means of R32.