Example

Prerequisites

Sensor: temperature sensor, measuring range –50 to 100 °C

Temperature to be measured 25 °C

Order of events with LOGO!Soft Comfort

The sensor converts the temperature from 25 °C to a voltage value of 5.0 V.
LOGO! converts the 5.0 V to the standardized value 500.
Using the sensor and measurement range data, LOGO! ascertains the value 0.15 for the gain and the value –50 for the offset.
According to the formula:
Analog value = (standardized value x gain) + offset
LOGO! calculates as analog value:
Analog value = (500 x 0.15) - 50 = 25

Order of events with LOGO!

The sensor converts the temperature from 25 °C to a voltage value of 5.0 V.
LOGO! converts the 5.0 V to the standardized value 500.
From the sensor and measuring range data you must establish the values for gain and offset.
According to the formulas:
Gain = (maxSensor – minSensor) / (maxnorm – minnorm)
and
Offset = minSensor – (Gain x minnorm)
it follows that
Gain = (100 – (-50)) / (1000 – 0) = 0.15
Offset = -50 – (0.15 x 0) = -50
According to the formula
Analog value = (standardized value x gain) + offset
LOGO! calculates as analog value:
Analog value = (500 x 0.15) - 50 = 25

Additional examples

Physical quantity
Electric quantity of sensor
Standardized value
Gain
Offset
Analog value
0 V
5 V
10 V
0
500
1000
0.01
0
0
5
10
4 mA
12 mA
20mA
0
500
1000
10
0
0
5000
10000
0 mA
10 mA
20 mA
0
500
1000
1
50
50
550
1050
1000 mbar
3700 mbar
5000 mbar
O V
6.75 V
10 V
0
675
1000
4
1000
1000
3700
5000
-30 °C
0 °C
70 °C
0 mA
6 mA
20 mA
0
300
1000
0.1
-30
-30
0
70

Physical quantity	Electric quantity of sensor	Standardized value	Gain	Offset	Analog value
	0 V 5 V 10 V	0 500 1000	0.01	0	0 5 10
	4 mA 12 mA 20mA	0 500 1000	10	0	0 5000 10000
	0 mA 10 mA 20 mA	0 500 1000	1	50	50 550 1050
1000 mbar 3700 mbar 5000 mbar	O V 6.75 V 10 V	0 675 1000	4	1000	1000 3700 5000
-30 °C 0 °C 70 °C	0 mA 6 mA 20 mA	0 300 1000	0.1	-30	-30 0 70