Definitions Of Terminology - Mitsubishi Electric MELSEC Q Series Reference Manual

DEFINITIONS OF TERMINOLOGY

Definitions of the terms used in this manual are explained below.
Term
Cyclic transmission
Transient transmission
Link dedicated instruction
CC-Link dedicated instruction
RAS
Control station
Normal station
Reserved station
Relay station
Undefined station
Return
Disconnection
Device
Link device
Link scan time
Link refresh
Routing
Buffer memory
Baton pass
Control station switching time
Shared group No.
Group No.
Control CPU
Control system CPU
A function by which data are periodically exchanged among stations on the same network using link
devices (LB, LW, LX, and LY) of a CC-Link IE Controller Network module.
• LB/LW is used to send data of one station to all stations. (1:N communication)
• LX/LY is used to send data of one station to another station. (1:1 communication)
A function of communication with another station, which is used when requested by a dedicated instruction
or a programming tool
A dedicated instruction used for transient transmission with a programmable controller on another station.
This instruction allows a master/local module to communicate with programmable controllers on the same
network.
Dedicated instruction that is used for transient transmission with CC-Link IE Controller Network compatible
devices. This allows communication with a station on the same network.
The abbreviation for Reliability, Availability, and Serviceability.
This term refers to usability of automated equipment.
Only one station that controls the network to which it is connected.
Each station's send range for cyclic transmission is assigned to the control station.
Station that performs cyclic transmission according to the range assignment of the control station
A station reserved for future use. This station is not actually connected, but counted as a connected
station.
A station that includes two or more network modules. Data are passed through this station to stations on
other networks.
Station to which a station No. is to be set in the sequence program, however, that has presently no station
No. because the UINI instruction has not been executed yet.
Processing that restarts data link when a station recovers from an error
Processing that stops data link if a data link error occurs.
A device (X, Y, M, D, or others) in a CPU module
A device (LB, LW, LX, or LY) in a module on CC-Link IE Controller Network
Time required for all the stations on the network to transmit data.
The link scan time depends on data volume and the number of transient transmission requests.
Data transfer between a link device in a module on CC-Link IE Controller Network and a device in a CPU
module.
Link refresh is performed in the END processing of the CPU module's sequence scan.
A process of selecting paths for communication with other networks.
CC-Link IE Controller Network requires communication paths to be preset using routing parameters to
communicate with stations on different networks.
Memory area in the CC-Link IE Controller Network module, in which data are temporarily stored
A token to send data over a network
Time taken from when the control station went down due to a reason such as power-off until data link is
started by the sub-control station
Number that is assigned to a station to allow it to share cyclic data with any given stations.
Cyclic data can be shared only with stations of the same group.
Number that is assigned for transient transmission to any given stations.
By specifying a group of stations as transient transmission target, data can be sent to the stations of the
same group No.
A CPU module that controls connected I/O modules and intelligent function modules.
In a multiple CPU system, there are multiple CPU modules and each connected module can be controlled
by a different CPU module.
A CPU module that controls operations in a redundant system
Description
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