Modbus Mapping. WAGO Controller Modbus TCP

WAGO I/O System 750 Configuring via the Web-Based Management System (WBM) 197

750-890 Controller Modbus TCP; G4; 2ETH; SD

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10.18 Modbus Mapping

The WBM page “Modbus Mapping“ contains an overview of the current

Assignment of the Modbus registers for the I/O modules plugged into the local bus as well as the general division of the register areas.

Table 67: WBM page “Modbus Mapping”

I/O Mapping

Modbus Register [word addresses]

Entry

I/O Module

Default

1 … n

Order Number 750-XXX

Value (example) Description

1 Position of the I/O module on the local bus, starting with 1 behind the front-end

750-4xx station

WAGO item number of the I/O module

Input (RO) - 2.0 - 2.7 output (WO) - 2.0 - 2.7

Address of the input data in format

<SR>[.<SO>] - <ER>[.<EO>], with:

<SR> = Start register address

<ER> = End register address

<SO> = Start bit offset inside the

start register

<EO> = End bit offset inside the

end register

The bit offset is only specified for digital

I/O modules

Address of the output data in format

<SR>[.<SO>] - <ER>[.<EO>], with:

<SR> = Start register address

<ER> = End register address

<SO> = Start bit offset inside the

start register

<EO> = End bit offset inside the

end register

The bit offset is only specified for digital

I/O modules output (RW) -

I/O access -

514.0 - 514.7

RO

Address of the read back output data in format

<SR>[.<SO>] - <ER>[.<EO>], with:

<SR> = Start register address

<ER> = End register address

<SO> = Start bit offset inside the

start register

<EO> = End bit offset inside the

end register

The bit offset is only specified for digital

I/O modules

Read/write rights on the I/O module:

RO = Read only,

RW = Read and write

Manual

Version 1.2.2

198 Configuring via the Web-Based Management System (WBM) WAGO I/O System 750

750-890 Controller Modbus TCP; G4; 2ETH; SD

Modbus Coils [bit addresses]

Entry

I/O Module

Default

1 … n

Order Number 750-XXX

Input (RO) output (WO) - output (RW) -

I/O access

-

-

Value (example) Description

2 Position of the digital I/O module on the local bus, starting with 1 behind the frontend station

750-5xx WAGO item number of the digital I/O module

0 - 7

0 - 7

Bit address of the digital input data in format

[<SO>] – [<EO>], with:

<SO> = Start bit offset

<EO> = End bit offset

Bit address of the digital output data in format

[<SO>] – [<EO>], with:

<SO> = Start bit offset

<EO> = End bit offset

512 - 519

RW

Bit address of the read back digital output data in format

[<SO>] – [<EO>], with:

<SO> = Start bit offset

<EO> = End bit offset

Read/write rights on the I/O module:

RO = Read only,

RW = Read and write

General Modbus Mapping

Input Register (FC3, FC4, FC23)

Entry

Modbus address

Default

0xXXXX –

0xYYYY

Description -

Digital Input (FC1, FC2)

Entry

Modbus address

Default

0xXXXX –

0xYYYY

Description -

Value (example) Description

0x0000 – 0x00FF Register address area of the associated input data register physical input data Description of the content for the specified register address range

Output Register (FC6, FC7, FC22, FC23)

Entry

Modbus address

Default

0xXXXX –

0xYYYY

Value (example) Description

0x0000 – 0x00FF Register address area of the associated output data register

Description - physical output data

Description of the content for the specified register address range

Value (example) Description

0x0000 – 0x01FF Coil address area of the associated digital input data register physical input data Description of the content for the specified coil address range

Manual

Version 1.2.2

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750-890 Controller Modbus TCP; G4; 2ETH; SD

Digital Output (FC5, FC15)

Entry

Modbus address

Default

0xXXXX –

0xYYYY

Description -

Value (example) Description

0x0000 – 0x01FF Coil address area of the associated digital output data register physical output data

Description of the content for the specified coil address range

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Manual

Version 1.2.2