KL3464 and KL3468 - Basic Function Principles

The KL3464 and KL3468 analog input terminals process signals in the range from -0 V to +10 V with a resolution of 12 bits (4095 steps). The inputs are single-ended inputs with a common ground potential.

Process data output format

In the delivery state the process data are shown in two's complement form ( -1integer corresponds to 0xFFFF). Other presentation types can be selected via the feature register R32 (e.g. signed amount representation, Siemens output format).

Measured value

Input data

decimal

hexadecimal

0 V

0

0x0000

+5 V

16383

0x3FFF

+10 V

32767

0x7FFF

Process data equations

The process data that are transferred to the Bus Coupler are calculated using the following equations:

Neither user nor manufacturer scaling is active

Ya = (Ba + XADC) x Aa

(1.0)

Yout = Ya

 

Manufacturer scaling active (default setting)

Y1 = Bh + Ah x Ya

(1.1)

Yout = Y1

 

User scaling active

Y2 = Bw + Aw x Ya

(1.2)

Yout = Y2

 

Manufacturer and user scaling active

Y1 = Bh + Ah x Ya

(1.3)

Y2 = Bw + Aw x Y1

(1.4)

Yout = Y2

 

Key

XADC:

Output values of the A/D converter

 

Yout:

Process data to PLC

 

Ba ,  Aa:

Manufacturer gain and offset compensation

(R17, R18)

Bh ,  Ah:

Manufacturer scaling

(R19, R20)

Bw,  Aw:

User scaling

(R33, R34)

The equations of the straight line are enabled via register R32.

KL3464 and KL3468 - Basic Function Principles 1:
Signal processing