14
TERMS
This manual uses the terms listed in the following table unless otherwise noted.
Terms Description
ACPU A generic term for MELSEC-A series CPU modules.
Buffer memory Memory for intelligent function modules to store setting values and monitor values.
Built-in Ethernet port CPU
module
A generic term for MELSEC-Q series CPU modules and MELSEC-L series CPU modules with built-in Ethernet port.
C24 Another term for serial communication modules.
CC-Link IE A generic term for CC-Link IE Controller Network and CC-Link IE Field Network.
Connected station (host station) Connected station (host station) indicates a station directly connected to external devices
Control CPU A CPU module that controls each module. In a multiple CPU system, a control CPU can be set for each module.
CPU module A generic term for MELSEC programmable controller CPU.
Device Supported devices and internal devices (X, Y, W, etc.) of the CPU modules
E71 Another term for Ethernet interface modules
Engineering tool A tool for setting, programming, debugging, and maintaining programmable controllers.
The tool indicates GX Developer, GX Works2, and GX Works3 etc.
For the supported tools, refer to the following manual.
The user's manual for the module used or the MELSEC iQ-R Module Configuration Manual
External device A device which sends request message to the supported devices (such as a personal computer, HIM, measuring instrument,
ID units, barcode readers, regulators, and C24s).
Intelligent function module A generic term for MELSEC iQ-R series modules, MELSEC-Q series modules, and MELSEC-L series modules that have
functions other than input or output, such as A/D or D/A converter modules.
LCPU A generic term for MELSEC-L series CPU modules.
Link device Internal devices (LX/LY/LB/LW/RX/RY/RWr/RWw) of the network modules
MC protocol An abbreviation for MELSEC communication protocol
Protocols to access supported devices or programmable controller connected to supported devices from external devices.
Module access device A generic term for module device access of MELSEC iQ-R series and intelligent function module devices of MELSEC-Q/L
series.
Multidrop connection A connection when connecting a personal computer and multiple external devices or C24s in 1:n or m:n basis using RS-422/
485 interface
Network module A generic term for MELSEC programmable controller which can be connected to Ethernet, CC-Link IE Field Network, CC-
Link IE Controller Network, MELSECNET/H, and MELSECNET/10.
Other station Other station indicates a station connected to the connected station (host station) on the network.
QCPU A generic term for MELSEC-Q series CPU modules.
QnACPU A generic term for MELSEC-QnA series CPU modules.
RCPU A generic term for MELSEC iQ-R series CPU module.
Relay station A station that relays data link to other station with mounting more than one network modules on one programmable controller.
Request message A processing request message sent from external devices to the supported devices
Response message A processing result message sent from SLMP compatible devices in response to the request message
Special function module A generic term for MELSEC-A series modules and MELSEC-QnA series modules that have functions other than input or
output, such as A/D or D/A converter modules.
Supported device A generic term for devices which receive MELSEC communication protocol messages.
User frame A data name used when registering the fixed format part in a message to be transmitted between an external device and a
serial communication module, and using it for data transmission and reception. (The content of data in a user frame must be
the same as the specifications of the external device.)
Register the order (transmission control code, C24 station No., sum check, fixed data, etc.) of the head and end part of a
message to be transmitted to serial communication module.
This function is used for the on-demand function of MC protocol and the data send/receive function by nonprocedural
protocol.
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