Rockwell Automation RECOMM-CNET ControlNet Communications Module - Manual (Page 154)

Glossary-2 ControlNet Communications Module
Explicit Messaging - Used to transfer data that does not require
continuous updates. It is typically used to configure or monitor a
device’s parameters on the network.
fault action - Determines how the module and connected product
act when a communications fault (for example, a cable is
disconnected) occurs or when the scanner is switched out of run
mode. The former uses a communications fault action, and the latter
uses an idle fault action.
fault configuration - When communications are disrupted (for
example, a cable is disconnected), the module and SP600 drive can
respond with a user-defined fault configuration. The user sets the
data that is sent to the drive in the fault configuration parameters
(parameters 15 (Flt Cfg Logic) through 24 (Flt Cfg D2 In). When a
fault action parameter is set to use the fault configuration and a fault
occurs, the data from these parameters is sent as the Command
Logic, Reference, and/or Datalink(s).
flash update - The process of updating firmware in the module.
The module can be flash updated using the X-Modem protocol and
a RECOMM-232 serial converter.
hold last - When communications are disrupted (for example, a
cable is disconnected), the module and SP600 drive can respond by
holding last. Hold last results in the drive receiving the last data
received via the ControlNet connection before the disruption. If the
drive was running and using the reference from the module, it will
continue to run at the same reference.
I/O connection - 1-to-n-based I/O messaging link in which I/O data
is produced or consumed by a device without any interpretation.
I/O data - I/O data, sometimes called “implicit messages” or “input/
output,” transmit time-critical data such as a Logic Command and
Reference. The terms “input” and “output” are defined from the
scanner’s point of view. Output is transmitted by the scanner and
consumed by the module. Input is transmitted by the module and
consumed by the scanner.
Logic Command/Logic Status - The Logic Command is used to
control the SP600 drive (e.g., start, stop, direction). It consists of
one 16-bit word of input to the module from the network. The
definitions of the bits in this word depend on the drive.
The Logic Status is used to monitor the SP600 drive (for example,
operating state, motor direction). It consists of one 16-bit word of
output from the module to the network. The definitions of the bits in
this word depend on the drive.
master - see scanner