Rockwell-automation 20-COMM-M Modbus/TCP Adapter Bedienungsanleitung PDF herunterladen (Seite 87)

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 http://

www.software.rockwell.com/support/download/detail.cfm?ID=3390.

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.

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Rockwell-automation 20-COMM-M Modbus/TCP Adapter Bedienungsanleitung Seite 87