<11. DeviceNet Glossary >
11-1
IM 34M6H28-01E
1st Edition : Feb.01,1999-00
11. DeviceNet Glossary
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Bus-off:
Indicates that the error rate in the network is very high.
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CAN:
CAN is short for Controller Area Network. It is a communications protocol
developed as a LAN for use in an automobile. DeviceNet employs CAN technology.
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I/O communications:
This is a communications function which allows the exchange of control information (I/O
data) between masters and slaves in real time. This module supports the following two
types of I/O communications protocols of DeviceNet.
Polling:
Sends a polling instruction containing output data from the master to a specified slave; the
master then receives a response containing the input data from the slave (1 : 1 communica-
tion).
Bit Strobe:
Multicasts (broadcasts) a bit strobe request instruction from the master to multiple slave
systems and receives a response containing input data from each slave. Improves network
throughput as a request can be communicated to multiple slave systems simultaneously (1:
N communication). However, this is possible only in the case of slave systems with input
data of less than 8 bytes.
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ODVA :
ODVA is short for Open DeviceNet Vendor Association, Inc. It is a non-profit organization
formed by machine vendors with the aim to administer and popularize the DeviceNet
specification.
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Connection:
This is a logical communication channel for facilitating communications between nodes.
Maintains and manages communications between nodes.
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Device Profile:
Standardizes the configuration and behavior (the smallest data configuration and opera-
tion) of devices of the same type (equipment, etc.). Provides mutual exchangeability
between devices of the same type. Also known as a device model.
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Node:
Devices (equipment) linked in DeviceNet are called nodes.
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