Siemens SIREC D Handbuch Seite 190

Programming
H. Engineering Units -
display temperature in either degrees Fahrenheit or
Centigrade.
1. Programming Engineering Units - Use the
UP (↑) or DOWN (↓) Arrow Keys to scroll through
the menu items in the Point Setup Menu and
highlight "Eng units". Press ENTER and the dis-
play reads "units °C" or "units °F".
2. Selecting Units °C or Units °F - Use the UP
(↑) or DOWN (↓) Arrow Keys to toggle between
the two and select the units you wish to use.
Press ENTER and the display returns to the "Eng
units" menu item in the Point Setup Menu.
I.Alarms -
Refer to Paragraph 4.6.14 for
instructions on programming alarms.
J. Chart Scale -
Each point must be assigned to
a Chart Scale. Chart scale assignment is covered in
Paragraph 4.5.2.
4.6.10 Resistance
Detector (RTD).
available for selection.
1. Programming - From the Point Type menu
(Figure 4-12), use the UP (↑) or DOWN (↓) Arrow
Keys to highlight "Rtd" and press ENTER. A list of
available RTD types is presented.
• 10_ Cu
• 100_ PT 385
• 100_ PT 392
• 200_ PT 385
• 200_ PT 392
• 120_ ni
2. Selecting RTD Type - Use the UP (_) or
DOWN (_) Arrow Keys to highlight the desired
RTD type and press ENTER. The Point Setup
menu for Rtd's will be displayed and may require
programming of the following parameters:
• Point Tag (up to 10 characters)
• Decimal fix (0 or 1)
• Filter (seconds 0-30)
• Span/Offset (User selectable in Measurement
menu)
• Engineering Units (Deg C or Deg F)
• Alarm Setpoint (Limit, Deadband and Delay)
• Chart Scale
Each of these parameters is identical to that dis-
cussed in Thermocouple (T/C) Point Options and
Setup above. Refer to Paragraph 4.6.9 for pro-
gramming detail.
4-28
You can select to
Temperature
Several types of RTD's are
4.6.11 Calculated Point Types -
following menu items are available through the
Calculated Point Type menu:
•
Equation
•
High Peak
•
Low Peak
•
High/Low Difference
•
Moving Average
•
Time Average
•
Gated Timer
•
Totalize
Calculations may be performed on current point
values of a single point or a group of points if set in
Equations. The calculations are performed after
each scan of all measured points and the results are
stored until the next point scan.
Point number 1 through 6 may be defined as
any point type on the Point Type Menu.
However, point numbers 7 through 9 and A
through C are programmable as Calculated,
Conditional or External Point Types only.
Moving Average can be set on channels A,
B and C ONLY.
A. Parameters for Setup -
programming requires setting parameters for the
following:
• Point Range(High Peak, Low Peak, Hilo
Difference, Moving Average, Time Average,
Gated Timer, Totalize, Equation)
• Point Tag(all point types)
• Decimal Fix(all except Gated Timer)
• Basepoint(Hi Peak, Lo Peak, HiLo Difference,
Time Average, Moving Average, Totalize)
• Eng Units(all point types)
• Reset Control(all except Moving Average,
HiLo Difference and Equation)
• Alarms(all point types)
• Chart Scale(all point types)
• Time Period(Moving Average only)
• Gate Control(Gated Timer only)
• Flow Rate(Totalize only)
• Low Cutoff(Totalize only)
• Set Equation(Equation only)
Each of these parameters is discussed in detail in
the following paragraphs.
Siemens AG C79000-G7374-C211-01
NOTE
Calculated point
SIREC D Manual
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