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EXCEL 50/100/500/600/800 DATA POINTS
EN2B-0092GE51 R0512
11
• Pseudo analog points
• Pseudo digital points
• Pseudo totalizer inputs
• Pseudo point multistage
Pseudo analog points Pseudo analog points are software points containing an analog value in the user
program. A pseudo analog point could, for example
, contain a flow temperature
setpoint calculated from the room setpoint and the outside air temperature via the
heating curve.
Pseudo digital points Pseudo digital points are software points containing a digital value in the user
program.
For example, logical AND operation.
The AND operation provides a logical 1 output when all input conditions are also
logical 1. Otherwise the output is a logical 0. If the user program contains such an
AND operation on different input conditions, then the output could be available as a
pseudo digital datapoint.
Pseudo totalizer inputs Pseudo totalizer inputs are digital software points from the user program, where a
totalizer counter input is recorded
.
Pseudo point multistage Pseudo point multistage datapoints are identical to flexible datapoint of the type
"multistage" except that they allow for 16 stages (including the “off stage“) and the
attribute "Status Text" allows for 16 status texts to be attached. The attribute "Tech-
nical Address" is not required.
Global Datapoints
If your control and monitoring system contains more than one controller, the con-
trollers communicate with one another via the system bus. Any given controller can
thus both receive (read) datapoints from other controllers and transmit datapoints to
other controllers. Such datapoints are referred to as global datapoints.
NOTE: The term “global” as used here encompasses more than just those points
explicitly labeled as “global” in the CARE engineering tool.
Global datapoints which a controller receives (reads) from other controllers are
referred to as local global datapoints, and global datapoints which a controller
transmits to other controllers are referred to as remote global datapoints.
During CARE engineering, the program engineer must take care that he does not
exceed the maximum allowed 256 global datapoints (remote and local) per
controller.
C
SYSTEM BUS
LON
Fig. 4. Global datapoints are available to all controllers on the system bus