Rockwell Automation RECOMM-CNET ControlNet Communications Module User Manual

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Glossary

Glossary-3

module - Devices such as drives, controllers, and computers
usually require an module to provide a communication interface
between them and a network such as ControlNet. An module reads
data on the network and transmits it to the connected device. It also
reads data in the device and transmits it to the network.

The RECOMM-CNET ControlNet module is a module that connects
SP600 drives to a ControlNet network. Modules are sometimes also
called “adapters,” “cards,” “embedded communication options,”
“gateways,” and “peripherals.”

node addressing - The legal range or ControlNet addresses is
1-99. The ControlNet module includes two rotary switches to allow
the ControlNet address to be set. The ControlNet module reads the
vlaues of the switches only at power up.

non-volatile storage (NVS) - NVS is the permanent memory of a
device. Devices such as the module and drive store parameters and
other information in NVS so that they are not lost when the device
loses power. NVS is sometimes called “EEPROM.”

operator interface module (OIM) - A device that can be used to
configure and control a SP600 drive.

PCCC (Programmable Controller Communications Command) -
The protocol used by some controllers to communicate with devices
on a network. Some software products (for example, VS Utilities)
also use PCCC to communicate.

ping - A message that is sent by a DPI product to its peripheral
devices. They use the ping to gather data about the product,
including whether it can receive messages and whether they can
log in for control.

reference/feedback - The reference is used to send a reference
(for example, speed, frequency, torque) to the product. It consists of
one word of input to the module from the network. The size of the
word (either a 16-bit word or 32-bit word) is determined by the drive.

Feedback is used to monitor the speed of a product. It consists of
one word of output from the module to the network. The size of the
word (either a 16-bit word or 32-bit word) is determined by the drive.

RSNetWorx for ControlNet - A software tool for configuring and
monitoring ControlNet networks and connected devices. It is a 32-
bit Windows application that runs on Windows 95, Windows 98, and
Windows NT. Information about RSNetWorx for ControlNet software
can be found at http://www.software.rockwell.com/rsnetworx.

scanner - A separate module (of a multi-module controller) or a
built-in component (of a single-module controller) that provides
communication with modules connected to a network.