Allen-Bradley PowerFlex 20-COMM-D, User Manual

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Glossary-8
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.
U
UCMM (UnConnected Message Manager)
UCMM provides a method to create connections between DeviceNet
devices.
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 command data. If the
drive was running and using the Reference from the adapter, it will stay
running but at zero Reference.