Chapter 4
NI-FBUS CM Software
©
National Instruments Corporation
4-17
NI-FBUS Hardware and Software User Manual
4.
Right-click the session descriptor icon and select
WaitTrend
.
5.
The dialog box that opens waits until the NI-FBUS Communications
Manager receives a trend from any device on the bus. The trend data is
displayed in the
Results
box when the trend is received. The
Trend
dialog continues to wait for and display trends as they are received
until you close it with the
Cancel
button.
You can wait on trends from all types of descriptors, not just session
descriptors. For example, if you wait on a trend from a device
descriptor, the dialog box only displays trends coming from the device
that the specified descriptor represents. The same is true of link, virtual
field device, and block descriptors.
To exit the NI-FBUS Dialog utility, select
Exit
from the
File
menu.
Configuring the Link Active Schedule File
If you want to do scheduling and use publishers and subscribers, you must
follow the instructions in this section. You may ignore this section if there
is no schedule, if the schedule is downloaded over the network to
your Fieldbus interface, or if you are using software such as the NI-FBUS
Configurator.
Introduction to the Link Active Schedule File
You must download the Link Active Schedule file to your Fieldbus
interface before the board can have Link Active Scheduler functionality
on the Fieldbus network.
Save the Link Active Schedule file as an
.ini
file. You can download this
file to your interface board using the NI-FBUS Dialog utility.
For detailed information about the parameters in the Link Active Schedule
file, refer to the
Data Link Layer
section of the
Final Specification
version
of the
F
OUNDATION
TM
Fieldbus Specification
document.
