Rockwell Automation RECOMM-PBUS PROFIBUS Communications Module - Manual (Page 115)

Glossary Glossary-3
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
non-volatile storage (NVS) - 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.
parameter messaging - Used to configure, monitor, and diagnose
devices over the PROFIBUS network.
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.
PROFIBUS network - A network that uses RS485 to connect
devices (such as controller, drives, and motor starters). A
PROFIBUS network can support a maximum of 126 devices. Each
device is assigned a unique node address and transmits data on
the network at the same data rate.
A cable is used to connect devices on the network. It contains the
bus signal. Devices can be connected to the network in a daisy
chain connection.
General information about PROFIBUS and the PROFIBUS
specification are maintained by the PROFIBUS Trade Organization
(PTO). PTO is online at http://www.profibus.com.
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.