ABB SM2000 User Manual Supplement page 6

Videographic recorders

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Videographic Recorders

SM1000 and SM2000

Math result (Assigned to recording channels, retransmission outputs)

Constant (Any numerical value, up to 3 d.p.)

Fig. 2.1 Typical Math Block

Note.

Operators are evaluated from left to right therefore the above equation is evaluated as:

[(a1 + 52.4)* Log(a2)] – md2 and NOT as a1 + (52.4* Log(a2)) – md2.

Functions cannot be nested within other functions. To enter an equation requiring nested functions it is necessary to use

another math block, e.g. to evaluate the equation:

----------------------- -

proceed as follows:

52.4 a3

–

Enter math block 1 as m1 = a1 + a2/m2

–

Enter math block 2 as m2 = 52.4 – a3

Digital signals (md1 to md3) are evaluated as 0 (inactive) and 1 (active), thus in the following example:

m1 = a1 + a2*md1

the sum of (a1+ a2) is set to zero if the digital input md1 is also zero.

Source (Analog) – see Table 2.2

Function – see Table 2.4

Source (Digital) – see Table 2.3

Operators – see Table 2.1

2 Math Configuration

IM/SM2000ADV Issue 7

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