MVI56E-MNETC ♦ ControlLogix Platform
Glossary of Terms
Modbus TCP/IP Multi Client Enhanced Communication Module
Setup Guide
ProSoft Technology, Inc.
Page 69 of 72
April 18, 2011
P
Peer-to-Peer
A network relationship between devices where each device can send commands
as a master or client, and respond to commands as a slave or server.
Power Supply
Device that supplies electrical power to the I/O chassis containing the processor,
coprocessor, or other modules.
Protocol
The language or packaging of information that is transmitted between nodes on a
network.
S
Server
A Server is a software program, or the device on which that program runs, that
provides a specific kind of service to a Client software program, or the device on
which that program runs, on an Ethernet network.
A Server on an Ethernet network is equivalent to a Slave on a Serial network.
Simplex
A communications circuit or system designed to either transmit data or receive
data, but not both. Broadcast television is an example of simplex communication
system. A television station sends a TV signal but cannot receive responses
back from the television sets to which it is transmitting. The TV sets can receive
the signal from the TV station but cannot transmit back to the station.
Slave
A Slave is a software program, or the device on which that program runs, which
provides a specific kind of service to a Master software program, or the device on
which that program runs, on a serial network.
A Slave on a Serial network is equivalent to a Server on an Ethernet network.
Subnet Mask
A mask used to determine what subnet an IP address belongs to. An IP address
has two components: the network address, and the host (node or device)
address. For example, consider the IP address 150.215.017.009. Assuming this
is part of a Class B network (with a subnet mask of 255.255.0.0), the first two
numbers (150.215) represent the Class B network address, and the second two
numbers (017.009) identify a particular host on this network.
