Definitions Of Terminology - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

DEFINITIONS OF TERMINOLOGY

Term
Cyclic transmission
Transient transmission
Link dedicated instruction
RAS
Control station
Normal station
Reserved station
Relay station
Reconnection
Disconnection
Device
Link Device
Link scan time
Link refresh
Buffer memory
Baton pass
Control station shift time
Group No.
A - 18
A function by which data are periodically exchanged among stations on the network using
link devices
A function of communication with another station, which is used when requested by a
dedicated instruction or GX Developer
Dedicated instruction used for transient transmission.
Abbreviation for Reliability, Availability, and Serviceability.
This term is used to express the overall usability of automation systems.
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.
Station that is not actually connected to the network.
It must be included in the total number of stations in the network, since it is to be connected
in the future.
A station that includes two or more network modules. Data are passed through this station
to stations on other networks.
Processing of restarting data link when a faulty station becomes normal.
Processing of stopping data link when a data link error occurs.
Devices (X, Y, M, D, etc.) that are contained in a CPU module.
Devices (LB/LW/LX/LY) that are contained in a network module.
Time required for data of each station to be sent in order and to make one rotation in the
network.
The link scan time changes depending on the data volume or transient transmission
request.
Link scans are performed "asynchronously" with sequence scans of the CPU module.
Processing of data transfer between link devices of the network module and CPU module
devices.
Link refresh is performed in "END processing" of the sequence scan of the CPU module.
Memory area in an intelligent function module, in which data are temporarily stored.
The network module does not have any buffer memory area that is offered to the user.
A control mechanism in which transmission right (token) is passed around the network for
data transmission.
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 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.
Description
A - 18