Rockwell Automation 20-750-BNETIP BACnet/IP Option Module User Manual
Page 81
Rockwell Automation Publication 750COM-UM005B-EN-P - June 2014
81
Glossary
Status Indicators
LEDs that are used to report the status of the option module, network, and drive.
They are on the option module and can be viewed when the drive is powered and
its cover is removed.
Stop Action
When communication is disrupted (for example, a cable is disconnected), the
option module and drive can respond with a stop action. A stop action 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 option module, it will stay
running but at zero Reference.
Subnet Mask
An extension to the IP addressing scheme that lets you use a single network ID
for multiple physical networks. A bit mask identifies the part of the address that
specifies the network and the part of the address that specifies the unique node
on the network. A ‘1’ in the subnet mask indicates the bit is used to specify the
network. A ‘0’ in the subnet mask indicates that the bit is used to specify the
node.
For example, a subnet mask on a network may appear as follows: 11111111
11111111 11111111 11000000 (255.255.255.192). This mask indicates that 26
bits are used to identify the network and 6 bits are used to identify devices on
each network. Instead of a single physical Class C network with 254 devices, this
subnet mask divides it into four networks with up to 62 devices each.
Update
The process of updating firmware in a device. The option module can be updated
using various Allen-Bradley software tools. See
for more information.
Zero Data
When communication is disrupted (for example, a cable is disconnected), the
option module 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 option module, it will stay running
but at zero Reference.