SIREC D Display Recorder 7ND4000

4 Programming
4.1 INTRODUCTION
This chapter provides information for programming
the Recorder. Custom programming is required to
define functions and allows you to personalize features
for performing specific applications and tasks.
The programmed information is stored in nonvolatile
memory until modified by you. Programming is simplified
with menu-driven prompts which minimize the
amount of time required for programming. You have
to program the points or data channels both for
scaling, display and logging or recording. Other
options allow the user to program the display,
alarms and event monitoring as well as overall unit
operation.
NOTE
Programming will be easier with a full understanding
of the programming structure. For
this reason, it is recommended that you read
this entire chapter before attempting to program
your Recorder.
NOTE
Refer to Figure 4-1 for the overall Recorder
programming and menu Flow Chart. Refer to
Chapter 3 of this Manual for the Display and
Function menus.
4.1.1 Basic Recorder Functions.
The SIREC D is a 6 point or 12 point recorder of
which, depending on options, up to 12 channels
may be live or real world inputs. These are typically
voltages or currents. Any channel not being used to
record or display live inputs may be used as a computational
channel. Inputs can be conditioned or
scaled to display any range of engineering units.
Refer to Figure 4-2.
Siemens AG C79000-G7374-C211-01
SIREC D Manual
Programming
A. Levels of Data Handling - There are four
distinct levels of data handling, namely conversion,
conditioning, scaling and display/record.
1. Conversion - Conversion applies only to live
inputs and is the process of converting real world
analog signals into a 16-bit digital value that can
be used by the Recorder. There are three fullscale
ranges for all conversions, 100 milliVolts, 1
Volt or 10 Volts DC, full scale. The converted values
pass to a conditioning block which converts
the binary value, which is effectively a percentage
of full scale, into a value useful to the user.
2. Conditioning - Conditioning includes converting
the binary value into a representative voltage,
conditioning and linearizing this voltage to represent
for example, a real world temperature as
might be input by a thermocouple or RTD, and
applying any other computation as required. The
conditioning block handles 12 channels. The outputs
from the conditioning block are referred to as
base points and may be fed back to the inputs of
the conditioning block to form the basis (base
point) for other base point computations. This includes
tracking peak or valley values, doing moving
averages, timed averages, difference, totalization
or any other user-entered equation.
The input to any channel in the conditioning block
can be any one of the base points, or in the case
of channels 1 through 6, can be the live inputs.
Live inputs can have input and output scaling applied
in the conditioning block unless this is predefined
by the nature of the input, i.e., thermocouples.
3. Scaling - The outputs of the conditioning block
are also the values represented in the Digital
Windows and are real-world engineering values.
The outputs of the conditioning block are also fed
through to a scale block where a chart scale is
applied to each point. The chart scales determine
what part of the full scale range will be used by
the display/record block. There are two sets of 8
scales available to the user. The second set is an
alternate set which can be applied to the base
points in place of the normal set when triggered
by an external event. Each chart scale may be
applied to any one or more of the base points to
provide an output scaled point.
4-1