Rockwell Automation 20-COMM-H RS485 HVAC Adapter FRN 2.xxx User Manual
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Glossary
20-COMM-H RS-485 HVAC Adapter User Manual
Publication 20COMM-UM009D-EN-P
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.
PowerFlex 7-Class (Architecture Class) Drives
The Allen-Bradley PowerFlex 7-Class family of drives supports DPI and
includes the PowerFlex 70, PowerFlex 700, PowerFlex 700H, PowerFlex
700S, PowerFlex 700L, and PowerFlex 7000. These drives can be used for
applications ranging from 0.37…3000 kW (0.5…4000 HP).
R
Reference/Feedback
The Reference is used to send a setpoint (for example, speed, frequency,
torque) to the drive. It consists of one word of output to the adapter 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 the drive. It consists of one word
of input from the adapter to the network. The size of the word (either a
16-bit word or 32-bit word) is determined by the drive.
S
Scanner
A scanner is a separate module (of a multi-module controller) or a built-in
component (of a single-module controller) that provides communication
with adapters connected to a network. See also Controller.
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.
T
Type 0/Type 1/Type 2 Control
When transmitting I/O, the adapter can use different types of messages for
control. The Type 0, Type 1, and Type 2 events help Allen-Bradley
personnel identify the type of messages that an adapter is using.
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, Reference, and Datalink
data. If the drive was running and using the Reference from the adapter, it
will stay running but at zero Reference.