User manual

Using SIMATIC PCS 7 OSx @aGlance1-6
SIMATIC PCS 7 OSx 4.1.1 @aGlance
1.2 Planning the SIMATIC PCS 7 OSx @aGlance Setup
The hot link (or monitor) provides your application with tag data that is
updated every time the tag values change. For a Windows application, the
@aGlance/IT Client Runtime program must be running in order to enable
hot links. This is not necessary for a Linux or UNIX application. Before you
establish the hot links, you need to consider these points.
 OSx @aGlance supports up to 16 tag points per hot link.
 Up to 256 hot links are permitted for each client.
 Up to ten clients can connect to the OSx @aGlance server.
You must purchase the @aGlance option for each station that you want to
use as an @aGlance server. Having more than one server on the system
provides you a backup capability in the event that one station acting as
server fails. You can also divide the data acquisition tasks, allowing one
server to provide trending data, for example, while another provides hot
links, and yet another provides cold links.
Use these guidelines when you determine which OSx stations are to be
servers.
 OSx Station Role — In most cases, do not choose the primary, which is
the busiest station on the system. Choose a non-primary unless you
anticipate extensive work with trending; in this case, the primary can
supply trending data most efficiently. Because of the configuration
work being done on the station with the sysadmin role, the sysadmin
may not be a good choice as a server. Any other role is acceptable
except for out_of_service.
 Connection Type — Either an operator or a supervisory station is an
appropriate choice for a server.
You can change the station acting as server at any time by changing address
information within the client. The new station must have the @aGlance
option installed.
When you configure the application client, you need to know the IP address
of each station that is to be a server. If the OSx station communicates on
two networks, you need both network IP addresses.
Determining Hot
Links
Choosing t he Host
Station
Obtaining
IP Addresses