Rockwell Automation 1395 ControlNet Communication Board - Manual (Page 16)

3–2 Configuration & PLC Interfacing
Publication 1395–5.37– March, 1999
Parameter Table – A table which contains all parameters that are
available in the Drive and adapters.
Sink Parameter – Sink parameters accept data from other
parameters which is then used by the Drive to
perform the desired functions. An example of a
sink is the external velocity reference parameter
which accepts a speed reference from a device
such as a PLC.
Scheduled Transfer – Deterministic and repeatable transfers that are
continuous and asynchronous to the ladder-logic
program scan.
Unscheduled Transfer – Non-deterministic data transfers through
ladder-initiated communication or programming
devices.
Source Parameter – A parameter that contains real time information
that is available for use by other devices. These
devices can include PLC controllers, operator
interface devices, program terminals, etc.
Operation The primary purpose of the CNA board is to allow the 1395 Drive to
be directly controlled by a PLC via ControlNet. This adapter has one
Digital communication channel with a redundant connector to allow
for backup communication to the PLC.
All scheduled data transfers between the PLC and the 1395 Drive must
be configured on a ControlNet network. You must specify where I/O
data is to be read from or written to when establishing the relationship
between processors, I/O adapters and data table file addresses.
!
ATTENTION: When configuring this drive on a
ControlNet network, you must request a Network
Update Time (NUT) of 5ms or greater. A NUT less
than 5ms may cause data transfers to (and from) the
drive to become non–deterministic.