Rockwell Automation 22-COMM-B PowerFlex BACnet MS/TP Adapter - Manual (Page 66)

G-4 Glossary
N
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.”
P
PCCC (Programmable Controller Communications Commands)
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.
PowerFlex 4-Class (Component-Class) Drives
The Allen-Bradley PowerFlex 4-Class family of drives supports DSI
and, at the time of publication, includes the PowerFlex 4, PowerFlex 4M,
PowerFlex 40, and PowerFlex 400.
R Reference/Feedback
The Reference is used to send a setpoint (for example, speed, frequency,
torque) to the drive. It consists of one 16-bit word of output to the
adapter from the network.
Feedback is used to monitor the speed of the drive. It consists of one
16-bit word of input from the adapter to the network.
S Status Indicators
Status indicators are LEDs that are used to report the status of the
adapter, network, and drive. They are on the adapter and can be viewed
on the front cover of the drive when the drive is powered.
Z
Zero Data
When communications are disrupted (for example, a cable is
disconnected), the adapter and drive can respond with zero data. Zero
data results in the drive receiving zero as values for Logic Command and
Reference data. If the drive was running and using the Reference from
the adapter, it will stay running but at zero Reference.