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| 型號： | TSPUNO |
| 英文描述： | TREND SERVER PROG. SINGLE |
| 中文描述： | 趨勢服務器PROG。單 |
| 文件頁數(shù)： | 81/104頁 |
| 文件大?。?/td> | 3878K |
| 代理商： | TSPUNO |
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43-TV-25-11 GLO Issue 11 03/02 UK
73
Appendix A - Maths
Expressions
A maths expression is made up of a number of terms. A term is the smallest
valid component in a maths expression and can be a variable, operator or function.
Certain operators and functions have the same effect in a maths expression - for
example,
$
or
SQRT
will both perform the square root of an operand.
An operand may be a constant (i.e. a fixed number) or a
variable
. The variables
that can be used are described below.
In the following examples P1 (Pen 1) equals the result of the maths
expression shown in the shaded area. A pen number (P1) will be auto-
matically entered when a pen is selected.
An
- The letter ‘A’ followed by a number
causes the reading taken from an analogue
input (denoted by the number) to be inserted in
the maths expression. In this example, the
readings from Analogue Input 1 are being displayed on Pen 1.
In
-
The letter ‘I’ followed by a number causes
the reading taken from a digital input (denoted
by the number) to be inserted in the maths
expression. In this example, the result of digital input 1 multiplied by digital
input 2 is displayed on Pen 9. As digital inputs are read as either 1 or 0, the
result of this maths expression will effectively be an AND function (i.e. digital
inputs 1 and 2 must both be 1 for the value displayed on Pen 9 to be 1 - see
).
On
- The letter ‘O’ followed by a number
causes the state of a Relay output (denoted by
the number) to be inserted in the maths expres-
sion. A Relay output is read as 1 when active and 0 when inactive.
Operators*
- can be either unary or binary. A unary operator requires one
operand after it to make a valid expression, whereas a binary operator
requires an operand on either side. For example # is a unary operator, as in
#2
(2 squared), whereas * is a binary operator, as in
2*3
(2 multiplied by 3).
*
Not
available on the
,
.
A new feature on the
and the
is MU (Memory use) DU,
(Disk use) and PU
*
(PC card use) gives a per-
centage reading of disk or memory space used.
*
Not available on the
,
.
NB. When entering the MU and DU feature using
, ensure the Complex Variables box is ticked.
P1= A1
P1= I1*I2
P1= O1
P1= MU
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