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 the iQ-R series CPU built-in port]

This is an example of an Ethernet connection setting with the iQ-R 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	00000000	Hexadecimal	bit	○	○
Output Relay	Y	00000000	Hexadecimal	bit	○	○
Internal Relay	M	00000000	Decimal	bit	○	○
Special Relay	SM	00000000	Decimal	bit	○	○
Latching Relay	L	00000000	Decimal	bit	○	○
Annunciator	F	00000000	Decimal	bit	○	○
Edge Relay	V	00000000	Hexadecimal	bit	○	○
Link Relay	B	00000000	Hexadecimal	bit	○	○
Special Link Relay	SB	00000000	Decimal	bit	○	○
Direct Access Input	DX	00000000	Hexadecimal	bit	○	○
Direct Access Output	DY	00000000	Hexadecimal	bit	○	○
Step Relay	S	00000000	Decimal	bit	○	○
Timer Contact	TS	00000000	Decimal	bit	○	○
Timer coil	TC	00000000	Decimal	bit	○	○
Integration Timer Contact	SS	00000000	Decimal	bit	○	○
Accumulator timer coil	SC	00000000	Decimal	bit	○	○
Counter Contact	CS	00000000	Decimal	bit	○	○
Counter coil	CC	00000000	Decimal	bit	○	○
Timer current value	TN	00000000	Decimal	word	○	●
Current value of the integration timer	SN	00000000	Decimal	word	○	●
Counter current value	CN	00000000	Decimal	word	○	●
Data Register	D	00000000	Decimal	word	○	●
Special Registers	SD	00000000	Decimal	word	○	●
Link Register	W	00000000	Hexadecimal	word	○	●
Special Link Register	SW	00000000	Hexadecimal	word	○	●
Index Register	Z	00000000	Decimal	word	○	●
File register (current block)	R	00000000	Decimal	word	○	●
File register (sequential number)	ZR	00000000	Hexadecimal	word	○	●
File register (sequential number)	ZZR	00000000	Decimal	word	○	●

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

About the access station

When connecting to the iQ-R/iQ-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_0978

If you want to communicate with the unit one-to-one, select access station 1. If you do not want to use an indirect 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_0979

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_0980

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 the iQ-R/iQ-L, care must be taken when accessing between other stations. If you connect directly to the attached port, you will not be able to access between other stations.

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

For details on models that support inter-station access and other information, please refer to Mitsubishi Electric's "SLMP Reference Manual."

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, refer to the Mitsubishi Electric "SLMP Reference Manual."

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 Works3, set it in "Unit Parameters".

c_plc_0981

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

c_plc_0982

Equivalent to iQ-R/iQ-L series CPU accessory port

Equivalent to iQ-R/iQ-L series CPU accessory port