Micromod Micro-PWC: 53PW6000 MicroPWC Configuration Guide - Manual (Page 315)

Micro-PWC CONFIGURATION GUIDE
Historical Block Data Collection 295
10.0 Historical Block Data Collection
10.1 Introduction
The Historical Block Database is designed for the efficient collection of data from a large number of
tag.atoms. Like the data collected in the Historical Database, the Historical Block Data is stored for use by
other applications, such as Logging, Trending and Data Archiving.
Historical Block configuration is used to create and edit Historical Blocks. Each Historical Block is a single
entity which contains data collected from multiple points in the controller database. All tags which are
named in the configuration of the Historical Block share the same settings for Collection Rate, Storage
Node, Computations, Pause and Raw Data.
The following guidelines should be observed when configuring Historical Block Data Collection.
• For optimum performance, each Historical Block should contain from 50 to 500 controller
tag.atoms.
• The recommended collection period is 30 seconds or longer.
• No more than 500 tags should be collected per instance in time from the same controller (i.e.,
no more than 500 tags should share the same Start Time). If more than 500 tags are being
collected, offset the time interval. For example, collect each set of tags every 30 seconds with
a start time deviation of 15 seconds.
• Up to 5,000 points can be collected per Micro-PWC server using Historical Block Data
Collection.