Rockwell Automation RECOMM-IBUS Interbus Communications Module - Manual (Page 114)

Glossary-2 Interbus Communications Module
DPI product - A device that uses the DPI communications interface
to communicate with one or more peripheral devices. For example,
a motor drive such as an SP600 drive is a DPI product. In this
manual, a DPI product is also referred to as “product” or “host.”
Explicit Messaging - see Peripheral Communications Protocol
(PCP) Messaging.
fault action - Determines how the module and connected product
act when a communications fault (for example, a cable is
disconnected) occurs or when the modules receives a “Stop
Transmission” command from the scanner. 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 10 (Flt Cfg Logic) through 19 (Flt Cfg D2)). 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 Interbus 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 data - I/O data 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.
Interbus Network - An Interbus network uses RS485 to connect
devices (for example, controllers, drives, and motor starters) and it
can support a maximum of 126 devices in a daisy chain
connection., Each device is assigned a unique node address and
transmits data on the network at the same data rate.
General information about Interbus and the Interbus specification
are maintained by the Interbus Club at http://www.ibsclub.com.
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.