Appendix 1: Data-Point Attributes; Analog Input Data-Point Attributes - Honeywell Excel 50 User Manual

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APPENDIX 1: DATA-POINT ATTRIBUTES

The information pertaining to a particular data-point is referred to as its attributes.

In the following sections, the data-points available on the Excel 50 MMI are

presented. Depending upon the data-point's type (analog input, digital output,

etc.), it can have various different attributes. The meanings of these attributes are

explained most extensively in section "Analog Input Data-Point Attributes".

See also section "Types of Physical Data-Points" on page 25 for a description of

analog input data-points. Their editable and non-editable attributes are displayed

in the following series of screens:

Fig. 78. Analog input data-point attributes (as exemplified by OATemp)

In the first screen, the data-point's name (which is non-editable) is displayed. You

can edit the switch-point value/state (the engineering unit is non-editable) and/or

change the operating mode field from "AUTO" to "MANUAL" (and vice-versa). See

also section "The 'Operating Mode' Attribute".

NOTE: If the operating mode is changed, an alarm screen with the message

"Manual operation" or "Auto operation" appears. Confirm the

alarm with CANCEL. You may now proceed to the next screen.

In the second screen, you can enable/disable trend logging for this data-point by

changing the attribute "Trend Log" from "ON" to "OFF" (and vice-versa). You can

also edit the values for "Cycle" and/or "Hyster".

NOTE: If "Cycle" is set to anything other than 0, time-based trending is enabled.

If "Cycle" is set to 0, then value-hysteresis trending is enabled using the

absolute value specified for "Hyster".

EN2B-0222GE51 R0216

EXCEL 50 MMI - USER GUIDE

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