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TERMS
Unless otherwise specified, this manual uses the following terms.
Term
Baton pass
Buffer memory
Control system
Dedicated instruction
Device
Engineering tool
Global label
Intelligent function module
Link device
Link refresh
Link scan (link scan time)
Logical channel
MELSECNET/10 mode
MELSECNET/H extended mode
MELSECNET/H mode
Module label
Normal station
Process CPU (redundant mode)
Redundant system
Relay station
Standby system
System switching
Description
A token to send data over a network
Memory in an intelligent function module for storing data such as setting values and monitored values.
When integrated into the CPU module, this memory refers to a memory for storing data such as setting values and
monitored values of the Ethernet function, and data used for data communication of the multiple CPU system
function.
A system that controls a redundant system and performs network communications in a redundant system
An instruction that simplifies programming for using functions of intelligent function modules
A memory of a CPU module to store data. Devices such as X, Y, M, D, and others are provided depending on the
intended use.
A tool used for setting up programmable controllers, programming, debugging, and maintenance
A label that is valid for all the program data when multiple program data are created in the project.
There are two types of global label: a module specific label (module label), which is generated automatically by GX
Works3, and an optional label, which can be created for any specified device.
A module that has functions other than input and output, such as an A/D converter module and D/A converter
module
A device (LB, LW, LX, LY, SB, or SW) in a MELSECNET/H network module
Data transfer between a link device in a network module and a device in a CPU module.
Link refresh is performed in the END processing of the CPU module's sequence scan.
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.
Eight input channels that can be changed by using a program. The channel number can be specified from 1 to 64 by
changing the values in the link special register.
This channel number is used to receive only the messages selected on the receiving station when they have a lot of
information types. The sending station is equivalent to a broadcasting station, which sends messages to logical
channels. The receiving station is equivalent to a TV receiver in household, which receives the messages in the
required logical channels by switching channels.
Mode that the MELSECNET/H network module operates on the MELSECNET/10 network.
A mode in which the maximum number of link points per station in MELSECNET/H mode is extended.
Values exceeding 2000 bytes to maximum 35840 bytes can be set.
Set this mode for a system that uses a large number of link points per station.
Mode that the MELSECNET/H network module operates on the MELSECNET/H network.
A label that represents one of memory areas (I/O signals and buffer memory areas) specific to each module in a
given character string.
For the module used, GX Works3 automatically generates this label, which can be used as a global label.
A station that performs cyclic transmission and transient transmission with the control station and other normal
stations
A Process CPU operating in redundant mode.
A redundant system is configured with this CPU module. Process control function blocks and the online module
change function can be executed even in this mode.
A system consisting of two systems that have same configuration (CPU module, power supply module, network
module, and other modules). Even after an error occurs in one of the two system, the other system takes over the
control of the entire system.
A station that includes two or more network modules. Data are passed through this station to stations on other
networks.
A backup system in a redundant system
A function which switches the systems between the control system and the standby system to continue operation of
the redundant system when a failure or an error occurs in the control system
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