Rockwell Automation 25-COMM-D PowerFlex 525 DeviceNet Adapter User Manual
Page 135
Rockwell Automation Publication 520COM-UM002A-EN-E - April 2013
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Glossary
Node Address
A DeviceNet network can have as many as 64 devices connected to it. Each
device on the network must have a unique node address between 0 and 63. Node
address 63 is the default used by non-commissioned devices. Node addresses are
sometimes called ‘MAC IDs’.
NVS (Non-Volatile Storage)
NVS is the permanent memory of a device. Devices such as the adapter 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.”
Objects
The DeviceNet specification defines an object as “an abstract representation of a
particular component within a product.”
PCCC (Programmable Controller
Communications Command)
PCCC is the protocol used by some controllers to communicate with devices on
a network. Some software products (for example, DriveExplorer and
DriveExecutive) also use PCCC to communicate.
Polled I/O Data Exchange
A device that is configured for polling I/O data exchange sends data immediately
after it receives a request for the data. For example, an adapter receives a Logic
Command from the scanner and then sends back the Logic Status of the
connected PowerFlex drive.
PowerFlex 525 Drives
The Allen-Bradley PowerFlex 525 drives are part of the PowerFlex 520-Series of
drives.
Product/Consumer Network
On producer/consumer networks, packets are identified by content rather than
an explicit destination. If a node needs the packet, it will accept the identifier and
consume the packet. Therefore, the source sends a packet once and all the nodes
consume the same packet if they need it. Data is produced once, regardless of the
number of consumers. Also, better synchronization than Master-Slave networks
is possible because data arrives at each node at the same time.
Reference/Feedback
The Reference is used to send a setpoint (for example, speed, frequency, torque)
to the drive. It consists of one 32-bit word of output to the adapter from the
network.
Feedback is used to monitor the speed of the drive. It consists of one 32-bit word
of input from the adapter to the network.
RSLogix 5000 Software
RSLogix 5000 software is a tool for configuring and monitoring controllers to
communicate with connected devices. It is a 32-bit application that runs on
various Windows operating systems. Information about RSLogix software can be
found at
. See also Studio 5000
environment.