Modbus II
An industrial networking system that uses token*passing peer*to*peer communications at data transfer rates of five megabits per second The network medium is coaxial cable
modem
Modulator/demodulator A device that conditions digital data for transmission along an analog signal path, or conditions input signals received from the path for use as digital data
network
The interconnection of devices sharing a common data path and protocol for communication On Modbus Plus, the devices share in the passing of a common token frame to gain sequential access for sending messages
Network Option Module
A hardware module that is mounted into a common backplane together with a Programmable Controller, communicating with the controller over the backplane The module connects to the Modbus Plus network and provides the central point for communication between the controller's application program and the node devices on the network
node
A device that has a direct point of access to a communications network On Modbus Plus, any device that is physically connected to the network
OSI Model
Open Systems Interconnection Model A reference standard describing the required performance of devices for data communication Produced by the International Standards Organization
| Peer Cop |
|
| A method of peer*to*peer communication between networked | |
| devices in which data is transferred as part of the passing of tokens | |
| between nodes Each node passes the token in the network's | |
| address sequence, and can be configured to transmit data in | |
| addition to the token All nodes monitor the token passes, and can | |
| be configured to extract data from them Nodes are setup for Peer | |
| Cop transfers as part of their initial configuration, and continue | |
| using Peer Cop as long as they are active on the network | Four |
| kinds of Peer Cop communication can be transacted during each | |
| token pass: see Glol Input Glol Output Specific Input | |
| and Specific Output |
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94 | Glossary | 31007492 |
