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About the Generic Terms and Abbreviations
Unless otherwise specified, this manual uses the following generic terms and
abbreviations to explain the QJ71MT91 MODBUS
R
/TCP interface module.
Generic Term/Abbreviation
Description
QJ71MT91
Abbreviation for the QJ71MT91 MODBUS
R
/TCP interface module.
MODBUS
R
/TCP
Generic term for the protocol designed to use MODBUS
R
protocol messages on a
TCP/IP network.
MODBUS
R
serial protocol
Generic term for the protocol designed to use MODBUS
R
protocol messages on a
serial interface.
FC
Abbreviation for the function code.
SC
Abbreviation for the sub code.
Programmable controller CPU
Generic term for the Q00JCPU, Q00CPU, Q01CPU, Q02CPU, Q02HCPU,
Q06HCPU, Q12HCPU, Q25HCPU, Q02PHCPU, Q06PHCPU, Q02PHCPU,
Q25PHCPU, Q12PRHCPU, Q25PRHCPU, Q02UCPU, Q03UDCPU, Q04UDHCPU
Q06UDHCPU, Q13UDHCPU, Q26UDHCPU, Q03UDECPU, Q04UDEHCPU,
Q06UDEHCPU, Q13UDEHCPU and Q26UDEHCPU.
GX Developer
Generic product name for SWnD5C-GPPW-E, SWnD5C-GPPW-EA, SWnD5C-
GPPW-EV, and SWnD5C-GPPW-EVA. ("n" means version 4 or later.)
"-A" and "-V" mean "volume license product" and "version-upgrade product"
respectively.
Ethernet module
The QJ71E71-100 Ethernet interface module.
Ethernet Address
A machine-specific address that is also referred to as the MAC (Media Access Control)
address. This is used to identify the addresses of external devices over a network.
The Ethernet address of the QJ71MT91 can be verified on the MAC ADD column of
the rating plate.
MELSECNET/H
The MELSECNET/H network system.
Master
The side from which a request is sent to execute a function.
Slave
The side where the execution request from the master is processed and its execution
result is sent.
Master function
The function that allows communication with the MODBUS
R
/TCP compatible slave
device as the master of MODBUS
R
/TCP.
Slave function
The function that allows communication with the MODBUS
R
/TCP compatible master
device as the slave of MODBUS
R
/TCP.
Request message
The message used to give a function execution request to the slave
In the MODBUS
R
protocol, a function execution request is given from the master to
the slave.
A function execution request cannot be given from the slave to the master.
Response message
The message with which the slave returns a function execution result to the master.
Target device
Generic term for the communication targets connected for data communication.
(personal computer, other QJ71MT91 MODBUS
R
/TCP interface module, MODBUS
R
protocol compatible device, etc.)
Personal computer
The IBM PC/AT or compatible DOS/V-based personal computer.
MBRW
Abbreviation for Z.MBRW or ZP.MBRW.
MBREQ
Abbreviation for Z.MBREQ or ZP.MBREQ.
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