Rievtech ELC Series - Page 92

EN
Programmable Relay ● User Manual for ELC, EXM and PR Series 92 2020 v6.0 ● © Rievtech Co.,
Ltd. ● www.rievtech.com
Actual value Ax = (internal value at input Ax * gain) +
offset
Gain and offset calculation
The gain and offset are calculated based on the relevant
high
and low values of the function.
Example 1:
The available thermocouples have the following technical
data:
–30 to +70 ℃, 0 to 10 V DC (i.e. 0 to 1000 in xLogic).
Actual value = (internal value ∙gain) + offset, thus
–30 = (0 ∙A) + B, i.e. offset B = –30
+70 = (1000 ∙A) –30, i.e. gain A = 0.1
Example 2:
A pressure sensor converts a pressure of 1000 mbar into a
voltage of 0 V, and a pressure of 5000 mbar into a
voltage of 10 V.
Actual value = (internal value. gain) + offset, thus
1000 = (0·A) + B, i.e. offset B = 1000
5000 = (1000 ∙A) +1000, i.e. gain A = 4
Example of analogue values
Process
variable
Voltage
(V)
Intern
al
value
Gain
Offset
Value
shown
(Ax)
–30
0
C
0
0
0.1
–30
–30
0
0
C
3
300
0.1
–30
0
+70
0
C
10
1000
0.1
–30
70
1000
mbar
0
0
4
1000
1000
3700
mbar
6.75
675
4
1000
3700
5000
mbar
10
1000
4
1000
5000
0
0
0.01
0
0
5
500
0.01
0
5
10
1000
0.01
0
10
0
0
1
0
0
5
500
1
0
500
10
1000
1
0
1000
0
0
10
0
0
5
500
10
0
5000
10
1000
10
0
10000
0
0
0.01
5
5
5
500
0.01
5
10
10
1000
0.01
5
15
0
0
1
500
500
5
500
1
500
1000
10
1000
1
500
1500
0
0
1
–200
–200
5
500
1
–200
300
10
1000
1
–200
800
0
0
10
–10000
–10000
10
1000
10
–10000
0
0.02
2
0.01
0
0
0.02
2
0.1
0
0
0.02
2
1
0
2
0.02
2
10
0
20
6.1.4. Special functions list – SF
When you create your circuit program in xLogicsoft, you
find the special function blocks in the SF list.
You can invert the inputs of SF’s individually, i.e. the circuit
program converts a logical “1” at the input into a logical “0”;
a logical “0” converts to logical “1”. The table also specifies
whether the relevant function can be set retentive (Rem).
The following SF’s are available:
Table 21 SF - Special Functions List