參數(shù)資料
型號： TSPUNO
英文描述： TREND SERVER PROG. SINGLE
中文描述： 趨勢服務(wù)器PROG。單
文件頁數(shù)： 87/104頁
文件大?。?/td> 3878K
代理商： TSPUNO
43-TV-25-11 GLO Issue 11 03/02 UK
79
Example:-
The temperatures of two adjacent kilns are being monitored. Kiln 1 is being
monitored on Analogue Input 1 of a recorder, and Kiln 2 on Analogue Input 2. It is notice-
able that when Kiln 1 reaches a temperature above 750 °C, the Kiln 2 temperature
increases by 2% of the Kiln 1 temperature. How can the recorder be set up so that this
2% increase is ignored
A high alarm on Analogue Input 1 is set so that when the temperature reaches above
750 °C Relay output 1 is activated.
Set the maths expression for Analogue Input 2 as P2 = A2 - ( (A1/50) * O1). This means
that when the temperature of Kiln 1 is below 750°C, O1 = 0 so the above expression will
be P2 = A2.
When the temperature is above 75 0°C, O1 = 1 so the term A1/50 (which is 2% of the
value of A1) will be subtracted from the value of A2. This will give the temperature of Kiln
2 as it would be without the effect of Kiln 1.
Calculations are performed in the order in which they are written from left to right. So
for the expression
P1 = A1 + A2/2 * A3
, the sequence of calculations would run as fol-
lows:-
A1 + A2
then r / 2
then r *A3
where ‘r’ is the result of the calculation performed on the preceding line. Use round
brackets to change the order of precedence - e.g. P1 = A1 + (A2/2) * A3 would give a dif-
ferent result from the above example as A2 is divided by 2
before
it is added to A1.
Spaces are not recognised in maths
expressions and the expression can be writ-
ten anywhere within the 250 character text
field.
More than one set of brackets can be
used in a maths expression. For example, if
you wanted the value of the square root of
Analogue Input 3 to be rounded to the near-
est whole number the expression would be
written in one of three ways as shown opposite.
In the first and third example the round
brackets surrounding
A3
can be omitted -
they are included to make the expression
easier to understand.
Maths and Fail Safe
When using output relays in a maths expression be aware the maths is reporting the
literal state of the relay.
If Pen 1 (P1) equals output channel 4 (O4) and fail safe
is On with no alarm triggered, the relay will be energised
and P1 will return 1.
P1 = ROUND[$(A3)]
P1 = #(SQRT[A3])
P1 = #($(A3))
P1= O4
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