Rockwell Automation 1738-ADNX ArmorPoint I/O DeviceNet Adapters - Manual (Page 6)

Publication 1738-UM001A-EN-P - February 2005
Preface 4
Cyclic DeviceNet communications method in which the adapter
sends data cyclically based on a configured time value. Data is
independently received cyclically from the sender. Data in both
directions can be acknowledged or unacknowledged
depending on the run time configuration of the system.
MACID Media Access Control Identifier (DeviceNet network address).
Master A DeviceNet network device (e.g., 1771-SDN) that initiates
communication with DeviceNet slave devices (e.g.,
ArmorPoint I/O modules) to retrieve data. The master only
receives unprompted data when the slave is enabled for COS
and there is a change in the device’s operating state.
Max Backplane MACID The 1738-ADNX has a unique attribute, Max(imum)
Backplane MACID. This value represents the highest node
address of a module residing on the backplane. This value
must be greater than or equal to the right most backplane
ArmorPoint I/O module, but must be less than that of any
non-backplane Subnet module.
Offline State of the adapter when it is not powered or maintaining
normal communication exchanges with other DeviceNet
devices.
Online State of the adapter when it is powered and maintaining
normal communication exchanges with other DeviceNet
devices.
PointBus The ArmorPoint I/O backplane PointBus maintains all
DeviceNet network protocol but also offers configuration
capabilities.
Polled DeviceNet communications method in which a module sends
data in response to received data.
Primary Network The primary DeviceNet network is defined as the DeviceNet
link that provides the direct connection between the
ArmorPoint DeviceNet adapter and a DeviceNet scanner.
RSNetWorx for DeviceNet Configuration software for the adapter and Subnet modules.
Scanlist The list of Subnet modules connected to the adapter. When
ADR is active, the scanlist stores the configured values of
each of the Subnet modules’ configurable parameters. When
ADR is not active, the scanlist stores only the module identity
information.
Scanner Operating state of the ArmorPoint DeviceNet adapter when it
retrieves I/O data from Subnet modules.
Slave A DeviceNet network device that cannot initiate
communication (except when configured with COS enabled)
but responds to a DeviceNet master device.
Strobe Adapter sends data in response to the strobe command. The
single bit allocated to the adapter in the strobe message is not
used. If the configured size of the input data (sent from the
adapter) is greater than 8 bytes, the strobe connection
establishment will fail. In this case, the input size must be
reconfigure to 8 bytes or less.
Term: Definition: