Schneider Electric INTERBUS Basic Specifikace stáhnout pdf (Strana 143)

Glossary

31004624 8/2009 143

CRC

cyclic redundancy check. Messages that implement this error checking mechanism

have a CRC field that is calculated by the transmitter according to the message’s

content. Receiving nodes recalculate the field. Disagreement in the two codes

indicates a difference between the transmitted message and the one received.

CSMA/CS

carrier sense multiple access/collision detection. CSMA/CS is a MAC protocol that

networks use to manage transmissions. The absence of a carrier (transmission

signal) indicates that a network channel is idle. Multiple nodes may try to

simultaneously transmit on the channel, which creates a collision of signals. Each

node detects the collision and immediately terminates transmission. Messages from

each node are retransmitted at random intervals until the frames are successfully

transmitted.

DDXML

Device Description eXtensible Markup Language

device name

A customer-driven, unique logical personal identifier for an Ethernet NIM. A device

name (or role name) is created when you combine the numeric rotary switch setting

with the NIM (for example, STBNIP2212_010).

After the NIM is configured with a valid device name, the DHCP server uses it to

identify the island at power up.

DeviceNet protocol

DeviceNet is a low-level, connection-based network that is based on CAN, a serial

bus system without a defined application layer. DeviceNet, therefore, defines a layer

for the industrial application of CAN.

DHCP

dynamic host configuration protocol. A TCP/IP protocol that allows a server to

assign an IP address based on a device name (host name) to a network node.

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Schneider Electric INTERBUS Basic Specifikace Strana 143