Definitions Of Terminology - Mitsubishi Electric MELSEC Q Series Reference Manual

DEFINITIONS OF TERMINOLOGY

Term
Cyclic transmission
Transient transmission
Link dedicated instruction
RAS
Remote master station
Remote I/O station
MELSECNET/10 mode
MELSECNET/H
(MELSECNET/10 mode)
remote I/O station
Reserved station
Relay station
Reconnection
Disconnection
Device
Link Device
Link scan time
Link refresh
I/O refresh
Automatic refresh
Buffer memory
Baton pass
Group No.
A - 19
Function by which data communications are performed periodically between a remote master
station and remote I/O stations using link devices (LB/LW/LX/LY) of network modules.
This function allows communication with another station's programmable controller when a
request is made with a link dedicated instruction or from GX Developer.
Communications can be made with programmable controllers on the same or other networks.
Dedicated instruction used for transient transmission.
An abbreviation for Reliability, Availability, and Serviceability.
This term is used to express the overall usability of automation systems.
Master station on a remote I/O network
Station that performs cyclic transmission according to the range assignment of the remote
master station.
A mode to operate the MELSECNET/H remote I/O module on the MELSECNET/10 remote
I/O network
A remote I/O station where the MELSECNET/H remote I/O module is being operated in
MELSECNET/10 mode
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.
Station that relays transient transmission data to another network.
Link device data of a network module are transferred to another network module via this
station.
Multiple network modules are connected to one programmable controller.
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.
On the remote master station, data are transferred between the master module's link devices
and the CPU module's devices. Link refresh means this processing.
Link refresh is performed in "END processing" of the sequence scan of the CPU module.
On a remote I/O station, data are transferred between remote I/O module's link devices and
the following devices. I/O refresh means this processing.
• I/O module's devices
• Intelligent function module's devices
On a remote I/O station, data are transferred between remote I/O module's link devices and
intelligent function module's devices. Automatic refresh means this processing.
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.
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 - 19