ControlNet System Overview
1–3
Publication 17706.5.20 - June 1997
The part of the interval in which any given data will be sent depends
on its priority, of which there are two levels:
Scheduled Data—time-critical information that must be sent at a
fixed and repetitive rate is sent exclusively in the scheduled portion
of the NUT.
Unscheduled Data—information that does not have strict time
constraints. It is sent only if no data is waiting to be sent at a higher
priority.
The KFC15/KFCD15 module supports non-time-critical messaging
and programming data, and sends only unscheduled data.
Understanding the ControlNet Architecture
The ControlNet cable system provides the flexibility to design a
communication network for your application. To take advantage of
this flexibility, you should spend enough time planning how to install
your cable system before assembling any of the hardware. Consult
the ControlNet Cable System Planning and Installation Manual
(1786-6.2.1) for a full description of the cable system and detailed
installation instructions.
Planning the Host Cable System
A serial or parallel host (computer, controller, or other device) can
connect to the KFC15/KFCD15 module through either the parallel or
RS-232C serial port. Both ports on the KFC15/KFCD15 module
cannot be active at the same time so you must decide which port is
the most appropriate for your application. This decision determines
the cabling and hardware requirements for your system.