Rockwell Automation 1761-NET-DNI DeviceNet Interface (DNI) - Manual (Page 90)

Publication 1761-UM005B-EN-P - October 2006
90 Glossary
DeviceNet Master
A product capable of owning input/output (I/O) on a DeviceNet
network.
DeviceNet Slave
A product whose data (or portion of) can be owned by DeviceNet
master.
DF1 Full Duplex
DF1 is a standard (open) point-to-point communication protocol.
Virtually all Allen-Bradley controllers (PLC-3, PLC-5R, SLC, MicroLogix)
that support an RS-232 communication port support DF1.
Explicit Messaging
A DeviceNet message that gets/sets device configuration information.
Heartbeat
A mechanism that lets a device, set of devices, or a connection check
for operation or integrity. Also known as a watchdog.
Input Buffer
A set of 16-bit words that is available to a master on a DeviceNet
network. The input buffer in DNI Series A is configurable from 1… 16
data words (DNI Series B is configurable from 1…32). The data in the
input buffer originates from the device connected to the RS-232 port
(either by the DNI reading the data, or the RS-232 device writing the
data to the DNI). The input buffer terminology is used because the
data is input data to the DeviceNet master.
Messaging
A general term that identifies the exchange of data between devices.
The two major types of DeviceNet messaging are:
• I/O - DeviceNet master and DeviceNet slave.
• Peer-to-peer - Between compatible devices without a master’s
involvement.
Output Buffer
A set of 16-bit data words that is available to a Master on a DeviceNet
network. The output buffer in DNI Series A is configurable from 1…16