Promag CON-485 Series Operations Instructions download pdf (Page 41)

Memo-Graph S 5 Operation / adjusting device settings - Set-up to commissioning

Endress+Hauser 41

Detailed settings in the set-up under Signal settings - Analogue combinations:

Set-up -> Signal settings -> Analogue combinations -> Mathematics channel x

Formula Individual channels can be mathematically combined with each other and calculated with functions (g) / factors (a or b)

/ constants (c). The mathematics channels calculated in this way are treated as “real” analogue inputs, independent of

whether connected conventionally or via PROFIBUS (limit values, display, etc.).

Formula “f = (g(y1)*a) ? (y2*b) + c”: this enables you to use functions or calculate two channels with each other.

Formula “f = g(y1:y2)*b + c”: this enables you to form the average or the sum for consecutive channels y1 to y2.

Channel identification Explanation of the calculation carried out with this channel (or designation of the mathematics channel).

Function “g” For formula f = (g(y1)*a) ? (y2*b) + c: the mathematical function “g” is carried out on signal y1. This result can be calcu-

lated simultaneously with another signal y2. If the function is only to be used on y1, switch the second part of the for-

mula (y2+b) off by selecting “not used” for combination “?”.

" Caution!

lg, ln, sqrt only apply to R+ (quantity of pos. real numbers)

For formula f = g(y1:y2)*b+c: selection as to whether the average or the sum is to be formed from channels y1 to y2.

Signal “y1” Channel, which is to be combined with another (“y2”).

! Note!

Mathematics channels are can be cascaded.

Factor “a” Factor by which signal “y1” is multiplied. Factory setting: “1”.

Combination “?” Mathematical operator for combining the channels.

Signal “y2” Second signal, “y2”, that is to be combined with the first (“y1”).

Factor “b” Factor by which signal “y2” or g(y1:y2) is multiplied. Factory setting: “1”.

Constant “c” Constant that is added to the result of the combination of both signals “y1” and “y2”. Factory setting: “0”. Entry in the

technical (or physical) unit of the mathematics channel.

Engineering units Technical (or physical) unit of the calculated channel, e.g. “Watt” when multiplying voltage (“Volt”) and current

(“ampere”).

Decimal point Number of places after decimal point for the 4-digit display.

Zoom start Here, enter the lowest value that the mathematical combination can produce.

Example:

y1 measuring range = 0...10, a = 5, y2 measuring range = 0...20, b=3, k=4, addition of the channels according to the

formula: y = (0*5) + (0*3) + 4. Result: enter “4”.

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 97 98

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Promag CON-485 Series Operations Instructions Page 41