Rockwell Automation RECOMM-485 RS485 DFI Communications Module User Manual

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Glossary

Glossary-3

module - Devices such as drives, controllers, and computers
usually require a module to provide a communication interface
between them and a network such as RS485 DF1. 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 RS485 DF1 module connects SP600 drives to an RS485 DF1
network. Modules are sometimes also called “adapters,” “cards,”
“embedded communication options,” “gateways,” and “peripherals.”

node address - An RS485 DF1 network can have as many as 255
devices connected to it. Each device on the network must have a
unique node address from 0 to 254.

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 - 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.

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.