Manuals > Device Connection Guide > Mitsubishi Electric > Public Protocol (Ethernet)

About the connection example

Please see below for an example of connection settings for this driver.

Applicable models etc.	explanation
Connection example [Using Q Series Ethernet unit]	This is an example of Ethernet connection settings with the Q series (using the Ethernet unit).
Connection example [Using Q Series CPU built-in port]	This is an example of Ethernet connection settings with the Q series (using the CPU built-in port).
Connection example [Using the QnUDV series CPU built-in port]	This is an example of an Ethernet connection setting with the QnUDV series (using the CPU built-in port).

Device List

The compatible devices are as follows (see here for how to view the device list).

device	keyword	Start address	explanation	unit	reading	Writing
Input Relay	X	000000	Hexadecimal	bit	○	○
Output Relay	Y	000000	Hexadecimal	bit	○	○
Internal Relay	M	000000	Decimal	bit	○	○
Special Relay	SM	000000	Decimal	bit	○	○
Latching Relay	L	000000	Decimal	bit	○	○
Annunciator	F	000000	Decimal	bit	○	○
Edge Relay	V	000000	Hexadecimal	bit	○	○
Link Relay	B	000000	Hexadecimal	bit	○	○
Special Link Relay	SB	000000	Decimal	bit	○	○
Step Relay	S	000000	Decimal	bit	○	○
Timer Contact	TS	000000	Decimal	bit	○	○
Timer coil	TC	000000	Decimal	bit	○	○
Integration Timer Contact	SS	000000	Decimal	bit	○	○
Accumulator timer coil	SC	000000	Decimal	bit	○	○
Counter Contact	CS	000000	Decimal	bit	○	○
Counter coil	CC	000000	Decimal	bit	○	○
Timer current value	TN	000000	Decimal	word	○	●
Current value of the integration timer	SN	000000	Decimal	word	○	●
Counter current value	CN	000000	Decimal	word	○	●
Data Register	D	000000	Decimal	word	○	●
Special Registers	SD	000000	Decimal	word	○	●
Link Register	W	000000	Hexadecimal	word	○	●
Special Link Register	SW	000000	Hexadecimal	word	○	●
Index Register	Z	000000	Decimal	word	○	●
File register (current block)	R	000000	Decimal	word	○	●
File register (sequential number)	ZR	000000	Hexadecimal	word	○	●
File register (sequential number)	ZZR	0000000	Decimal	word	○	●

When specifying an address for a ZR (file register) in decimal notation, use "ZZR".

About the access station

When connecting to the Q/L series CPU, three connection methods are supported depending on the network configuration. An access station is a connection station that connects to a personal computer via a connection station.

If you are connecting to an access station, please refer to the setting example below.

Access Station 1: When you want to communicate with a PLC connected to a PC

c_plc_0049

Select the driver for access station 1.

c_plc_0099

If you want to communicate one-to-one with the unit, select Access Station 1. If you do not want to use an intermediate connection, select Access Station 1.

Access station 2: When you want to communicate with a PLC connected via a network from access station 1

c_plc_0051

Select the driver for access station 2.

c_plc_0100

Add the driver for access station 2 and set the unit's communication settings to connect to access station 1.

Add another folder and set the connection parameters to access station 2 in the folder's communication settings.

c_plc_0053 　　　 c_plc_0102

Access station 3: When you want to communicate with a PLC connected via a network from access station 2

c_plc_0056

c_plc_0101

Add the driver for access station 2 and set the unit's communication settings to connect to access station 1.

Add another folder and set the connection parameters to access station 2 in the folder's communication settings.

c_plc_0053 　　　 c_plc_0103

When using a CPU with an Ethernet port such as QnUDE, care must be taken when accessing other stations. If you connect directly to the attached port, you will not be able to access other stations.

Therefore, when accessing other stations, you must use an Ethernet unit, and this operation depends on the MC protocol specifications.

For details on models that support inter-station access and other information, please refer to Mitsubishi Electric's "Q Compatible MELSEC Communication Protocol."

Network setting parameters

In the unit connection test dialog and folder network settings, specify the "Network Number", "PC Number", and "Request Unit I/O Number" on the MC protocol. Normally, communication can be achieved with the default settings of "00,FF,03FF". If you want to connect to a PLC on another station via MELSECNET, or if you have a multiple CPU configuration or a redundant CPU configuration, please set it according to the following.

[Connection test dialog]

c_plc_0135

[Folder Properties] c_plc_0134

1.Network Number
If you want to connect to another station via the MELSECNET network, specify the network number. If you want to connect to your own station's CPU (for normal connection), specify 00.

2.PC Number
If you want to connect to another station via the MELSECNET network, specify the slave station number. If you want to connect to your own station's CPU (for normal connection), specify FF.

3.Request unit I/O number
Normally, specify 03FF.
If you have multiple CPUs, specify the following:
Control CPU: 03FF No. 1 QCPU: 03E0 No. 2 QCPU: 03E1 No. 3 QCPU: 03E2 No. 4 QCPU: 03E3
For a redundant CPU, specify 03D0 (control CPU).

CPU Type	Setting Value
Control CPU	03D0
Standby CPU	03D1
A-series CPU	03D2
B-series CPU	03D3
Multi-CPU Unit 1	03E0
Multi-CPU Unit 2	03E1
Multi-CPU Unit 3	03E2
Multi-CPU Unit 4	03E3
Local CPU/Control CPU/Local CPU 03FF	03FF

For more information, please refer to Mitsubishi Electric's "Q Compatible MELSEC Communication Protocol."

Binary and ASCII protocols

Mitsubishi Electric's communication protocol can be selected from "Binary Code Communication" and "ASCII Code Communication". Binary code communication has a shorter packet length, so it allows for faster communication. Unless there is a specific reason not to, we recommend binary code communication.

For example, if you are using GX-Developer, set it in the "Network Parameters" "Operation Settings" dialog.

c_plc_0104

To communicate in binary code, select the binary protocol when selecting the following units.

c_plc_0105

Q/L series equivalent to QJ71E71

Q/L series equivalent to QJ71E71