ABB SM2000 User Manual Supplement page 8

...2 MATH CONFIGURATION
...2.8 Creating Math Blocks
*
Log
–
6
Source Id
None
Analog i/p A1
Analog i/p A2
Analog i/p A3
Analog i/p A4
Analog i/p A5
Analog i/p A6
a1
a1+
Enter constant (—999 to 9999)
5
a1+52.4
a1+52.4*
a1+52.4*Log(
Source Id
Analog i/p A1
Analog i/p A2
Analog i/p A3
Analog i/p A4
Analog i/p A5
Analog i/p A6
a1+52.4*Log(a2)
a1+52.4*Log(a2)—
Source Id
None
Digital Source 1
Digital Source 2
Digital Source 3
a1+52.4*Log(a2)–md1
Fig. 2.4 Worked Example
Maths Equations
Analog I/P
Input Type 4.0 - 20.0 mA
Engineering range
0 to 20000 Litres/sec
Short tag 8 Character
Long tag 20 Characters
Filter time constant
In seconds
Fault detect level (%)
110%
Broken sensor detection Upscale
2 . 4
Note. A digital signal must be assigned
to a digital source before it can be
selected as a Math block source – see
Reset Source/Digital Source 1.