EXCEL 50/100/500/600/800 | DATA POINTS |
•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
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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.
SYSTEM BUS
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LON
Fig. 4. Global datapoints are available to all controllers on the system bus
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