Equation; Operators And Operands Used For Equations; Programming Parameters For Calculated Equation Point Types; Selecting Calculated - Siemens SIREC D Handbuch

I. Equation -
Calculated Point Types allow you to
program an equation to calculate a value using one
or more points and/or constants.
1. Operators and Operands Used for Equa-
tions - Forty operators and/or operands are al-
lowed in any one formula programmed. If the
equation does not compute, the display will read
"bad operand". The following operators/operands
are used:
• P1 to PC - are used to represent Points
• K1 to KF - are used to represent Constants
• )
is a RIGHT Parenthesis
• +
is Add
• -
is Subtract
• *
is Multiply
• /
is Divide
• ^
is Fractional X
• **
is Integer (X
• Sq
is Square Root
• Ln
is Natural Logarithm
• Lg
is Base Ten Logarithm
• Ex
is Exponentiation (e
• (
is a LEFT Parenthesis
2. Programming Parameters for Calculated
Equation Point Types - The following steps de-
tail programming from the Main Menu:
a. Use the UP (↑) or DOWN (↓) Arrow Keys to
highlight "Prog point" and press ENTER. The
display reads "point? X".
b. Use the numeric Keypad to select the Point to
be programmed, 1 to 9 or A to C. Press ENTER
to accept the displayed point number and the
display reads one of the following Point Option
menu items:
• Setup pt X
• Copy pt x
• Restore pt X
• Modify pt X
• Delete pt x
c. Selecting Calculated - Use the UP (↑) or
DOWN (↓) Arrow Keys to highlight the desired
point option and press ENTER. The display will
show an item in the Point Type Menu.
d. Use the UP (↑) or DOWN (↓) Arrow Keys to
highlight "Calculated" and press ENTER. A
menu item in the Point Range Menu will appear.
e. Use the UP (↑) or DOWN (↓) Arrow Keys to
highlight "Equation" point range and press
ENTER.
Siemens AG C79000-G7374-C211-01
SIREC D Manual
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y
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x
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3. Programming Point Tag - Up to a ten char-
acter alphanumeric label card be assigned to
each point.
a. Use the UP (↑) or DOWN (↓) Arrow Keys to
highlight "Point tag" and press ENTER.
b. Use the Alphanumeric keypad to enter the
desired Point Tag and press ENTER to return to
"Point tag".
4. Decimal Fix - This Point Type must be as-
signed a decimal place of up to four places or sci-
entific notation. The choices are:
• 0 = X(no decimal places)
• 1 = X.X
• 2 = X.XX
• 3 = X.XXX
• 4 = X.XXXX
• 5 = Scientific Notation
Decimal places affect displayed point data values
only.
a. Programming Decimal Fix - Use the UP (↑)
or DOWN (↓) Arrow Keys to highlight "Decimal
fix" and press ENTER. The display reads
"places? X".
b. Use the UP (↑) or DOWN (↓) Arrow Keys to
select the number of decimal points required
then press ENTER. The display returns to
"Decimal fix" in the Point Setup Menu.
5. Set Equation - This Point Setup Menu item al-
lows you to program the desired equation.
a. Programming Set Equation - Use the UP
(↑) or DOWN (↓) Arrow Keys to highlight "Set
Equation" and press ENTER. The display reads
"XXX...XX".
Programming
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