16
TERM
Unless otherwise specified, this manual uses the following terms.
Term Description
ACPU Another term for the MELSEC-A series CPU module
Baton pass A token to send data over a network
Buffer memory
A memory in an intelligent function module, where data (such as setting values and monitoring values)
exchanged with a CPU module are stored
Buffer memory address
An address that indicates the storage location of data assigned to the buffer memory in an intelligent
function module
CC-Link
A field network system where data processing for control and information can be simultaneously performed
at high speed.
CC-Link dedicated instruction
A dedicated instruction used for transient transmission with a CC-Link IE Field Network device. This
instruction allows a master/local module to communicate with the device on the same network.
CC-Link IE Field Network A high-speed and large-capacity open field network that is based on Ethernet (1000BASE-T)
CC-Link IE Field Network interface board The abbreviation for the Q81BD-J71GF11-T2 CC-Link IE Field Network interface board
CCPASET The abbreviation for GP.CCPASET
Control CPU
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.
Control system CPU A CPU module that controls operations in a redundant system
Cyclic transmission
A function by which data are periodically exchanged among stations on the same network using link devices
(RX, RY, RWw, and RWr)
Data link Generic term for cyclic transmission and transient transmission
Dedicated instruction An instruction that simplifies programming for using functions of intelligent function modules
Device A device (X, Y, M, D, or others) in a CPU module
Disconnection A process of stopping data link if a data link error occurs
Ethernet adapter module The abbreviation for the NZ2GF-ETB CC-Link IE Field Network Ethernet adapter module
Ethernet device A generic term for devices, such as personal computers, that support IP (Internet Protocol) communications
GX Works2 The product name of the software package for the MELSEC programmable controllers
Head module The abbreviation for the LJ72GF15-T2 CC-Link IE Field Network head module
Intelligent device station
A station that exchanges I/O signals (bit data) and I/O data (word data) with another station by cyclic
transmission. This station responds to a transient transmission request from another station and also issues
a transient transmission request to another station.
Intelligent function module
A MELSEC-Q, -L, or iQ-R series module that has functions other than input and output, such as an A/D
converter module and D/A converter module
LCPU Another term for the MELSEC-L series CPU module
Link dedicated instruction
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 (CC-Link IE Field Network) and on other networks (Ethernet, CC-Link IE Controller Network, and
MELSECNET/H).
Link device A device (RX, RY, RWr, or RWw) in a module on CC-Link IE Field Network
Link refresh
Data transfer between a link device in a module on CC-Link IE Field Network and a device in a CPU
module. Link refresh is performed in the END processing of the CPU module's sequence scan.
Link scan (Link scan time)
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.
Link special register (SW) Word data that indicates the operating status and data link status of a module on CC-Link IE Field Network
Link special relay (SB) Bit data that indicates the operating status and data link status of a module on CC-Link IE Field Network
Local station
A station that performs cyclic transmission and transient transmission with the master station and other local
stations.
Loopback
A function that disconnects the station in which an error has occurred, and continues data link with the
stations that are operating normally. Stations connected after the faulty station can also continue data link.
Master operating station
A station that controls the entire system in the network where a master station and submaster station are
connected. The connected master station or submaster station works as a master operating station.
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