Specifications

8 – Configuring Points
148 R400
Every time points are configured, the server re-builds the scan packets in order to
re-optimize scanning. For example, the server will ensure that:
• If there are multiple references to an address at the same scan rate, there
will be only one entry in the scan packet.
• If there are multiple references to an address at different scan rates, a single
entry will be made at the fastest rate.
A separate scan packet is created for database addresses. Database addresses are
used to scan information from other point parameters or from files in the server
database. For details, see “Database Addresses” on page 179.
It is strongly recommended that you follow the instructions for optimizing scan
packets (and hence maximizing scanning performance) as described in the online
reference information for each controller interface.
Analyzing the Scanning Load with lisscn
The lisscn utility that comes with PlantScape can be used to list the details about
the currently configured scan packets in the server database.
Use the lisscn utility program to list the currently configured:
• Scan packets in each scan interval (or period)
• Number of scan packets per interval
• Scan packets per interval per second
For details of how you run the lisscn utility, refer to “lisscn” on page 512.
plscpcg.book Page 148 Monday, May 28, 2001 10:11 AM