Glossary, For details about, To the – Rockwell Automation 20-COMM-M Modbus/TCP Adapter User Manual
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20-COMM-M Modbus/TCP Adapter User Manual
Publication 20COMM-UM014C-EN-P
Glossary
A
Adapter
Devices such as drives, controllers, and computers usually require an
adapter to provide a communication interface between them and a network
such as Modbus/TCP. An adapter reads data on the network and transmits it
to the connected device. It also reads data in the device and transmits it to
the network.
The 20-COMM-M Modbus/TCP adapter connects PowerFlex 7-Class
drives to a Modbus/TCP network. Adapters are sometimes also called
“cards,” “embedded communication options,” “gateways,” “modules,” and
“peripherals.”
B
BOOTP (Bootstrap Protocol)
BOOTP lets the adapter configure itself dynamically at boot time if the
network has a BOOTP server. The BOOTP server assigns the adapter a
preconfigured IP address, a subnet mask, and a gateway address; therefore,
you do not have to configure these using the parameters in the adapter.
BOOTP can make it easier to administer an Ethernet network. A free
version of Rockwell Software’s BOOTP Server can be accessed at
.
C
CAN (Controller Area Network)
CAN is a serial bus protocol on which DPI is based.
ControlFLASH
An Allen-Bradley software tool that lets users electronically update
firmware on printed circuit boards.
Controller
A controller, also called programmable logic controller, is a solid-state
control system that has a user-programmable memory for storage of
instructions to implement specific functions such as I/O control, logic,
timing, counting, report generation, communication, arithmetic, and data
file manipulation. A controller consists of a central processor, input/output
interface, and memory. See also Scanner.
D
Data Rate
The speed at which data is transferred on the Modbus/TCP network. You
can set the adapter to a data rate of 10 Mbps Full-Duplex, 10 Mbps
Half-Duplex, 100 Mbps Full-Duplex, or 100 Mbps Half-Duplex. If another
device on the network sets or auto-negotiates the data rate, you can set the
adapter to automatically detect the data rate.