Honeywell Excel 50, User Manual, Page: 33 / 72

EXCEL 50 MMI - USER GUIDE
25 EN2B-0222GE51 R0216
Pressing the SYSTEM TOPICS fast-access key will cause a listbox with a
corresponding heading to appear (see Fig. 32).
Fig. 32. System topics
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