Trend Buffer Control - Honeywell EXCEL 5000 User Manual

EXAMPLES
Control Icons
74-5577–33 (US)
EN2B-0184 GE51 R0518 (Europe)
Purpose In many cases, trend logs include points whose values change frequently. Over a
lengthy time interval, these frequent variations in signal exhaust the capacity of the
trend buffer.
You can delay the filling of the trend buffer by preventing the writing of trend values
to the buffer for a defined time. After this time expires, you permit buffer writing
again for a short interval. The following diagram illustrates this procedure:
Use the CYC and SWI control icons.
Description CYC allows the writing of a point value to a software point during the On time of the
cycle. The software point is part of trend logging. During Off time, the point switches
into a self-hold condition, meaning that it maintains its previous value during the
entire Off time. Because this value does not change for the duration of the Off time,
it is also not written in the trend buffer.
270
CARE CONTROL ICONS

Trend Buffer Control