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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

Honeywell Excel 50 User Manual

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