Micromod Micro-PWC: 53PW6000 MicroPWC Configuration Guide - Manual (Page 269)

Micro-PWC CONFIGURATION GUIDE
Trends 249
7.0 Trending
7.1 Introduction
Types of trend recording available on the Micro-PWC include:
• Current trending
• Historical trending
• Archival trending
The current, historical, and archival trending functions display the values of one or more points in an
analog trend format similar to that presented by a conventional strip chart recorder.
A current trend for each point appears as a part of the point display; current trends are not configurable,
and are not stored. Current trending for a point exists only when the point is on display. Long term trending
is handled separately and is available in two forms:
• Up to 9,999 console group-wide Historical Trends (each of which can be configured to display
up to 8 traces) are available on the Micro-PWC. The configuration of these trends can be
performed on any Micro-PWC, and is then distributed to all other Micro-PWCs in the same
console group. The storage location of the actual trend data can be configured by the user via
the Historical or Historical Block database options, available from the Configure option on the
System Window menu.
• Archival Trending permits Historical Trends to be transferred to a removable tape cartridge,
creating a permanent record which can be retrieved and displayed at a later date.
Any non-text (i.e., non-ASCII) point which exists in the Historical database or Historica Block database can
be trended.
See the Micro-PWC Operator’s Manual for details on use of the various features of the Historical Trend
display.
7.2 Accessing Historical Trends
Historical trend configuration is performed in the Operator Window. The pointer must first be in an Operator
Window which has keyboard focus.
To enter trend configuration using the menus, from the menu bar choose Select > Trend. A pop-up window
(
Figure 7-1 ) appears , containing an entry box and numeric keypad.
TC00211A
Figure 7-1. Trend Index Entry Window