Types Of Data-Points; Types Of Physical Data-Points; Types Of Pseudo Data-Points - Honeywell Excel 50 User Manual

Pressing the SYSTEM TOPICS fast-access key will cause a listbox with a
corresponding heading to appear (see Fig. 32).
Regardless of your application or configuration, this listbox will always contain the
same three items from which to choose.

Types of Data-Points

With the Excel 50 MMI, it is possible to obtain information on a total of three
different basic groups of data-points:
 physical data-points (consisting of five different types);
 pseudo data-points (consisting of two different types);
 remote data-points (consisting of two different types);
 totalizer data-points (e.g. pulse counters, reset input).

Types of Physical Data-Points

Physical data-points are inputs and outputs directly connected to a hardware
device such as a sensor or an actuator. The Excel 50 MMI is equipped to handle
a maximum of 22 physical data-points. Physical data-points include the following:
 analog inputs (i.e. measured values received from field devices),
 analog outputs (i.e. modulating or floating control signals generated by the
controller, itself),
 digital inputs (i.e. state or alarm signals received from field devices),
 digital outputs (i.e. commands issued by the controller, itself), and
 totalizer signals (i.e. reset inputs or pulse meter inputs generated by / received
from field devices).

Types of Pseudo Data-Points

Pseudo data-points are generated in software to achieve the application. They are
not connected to any hardware device. Pseudo data-points include the following:
 pseudo analog (e.g. internally calculated values, calculated setpoints,) and
Fig. 32. System topics
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EXCEL 50 MMI - USER GUIDE
EN2B-0222GE51 R0216