Modbus SIO ASCII Master
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Device

Bit Address

Word Address

32

bits

Remarks

Coil

000001 - 065536

000001 - 065521

or

*1

Discrete Input

100001 - 165536

100001 - 165521

 *2

Input Register

-----

300001 - 365536

*2

Holding Register

400001,00 - 465536,15

400001 - 465536

*1You can set the data storing order in 32-bit data word units and 64-bit data double-word units in the Device Setting dialog box.

*2Write disable.

 

IEC61131 Syntax Address Description

The following table compares IEC61131 and MODBUS syntax address descriptions.

Device

MODBUS Syntax

 

IEC61131 Syntax

Format

0-based

1-based

Format

Range

First element

Range

First element

Range

First element

Coil

000001+i

i = 0 to 65535

000001

%Mi

i = 0 to 65535

%M00000

i = 1 to 65536

%M00001

Discrete Input

100001+i

i = 0 to 65535

100001

-

-

-

-

-

Input Register (Word)

300001+i

i = 0 to 65535

300001

-

-

-

-

-

Input Register (Word bit)

300001+i,j

i = 0 to 65535

j = 0 to 15

300001,00

-

-

-

-

-

Holding Register (Word)

400001+i

i = 0 to 65535

400001

%MWi

i = 0 to 65535

%MW00000

i = 1 to 65536

%MW00001

Holding Register (Word bit)

400001+i,j

i = 0 to 65535

j = 0 to 15

400001,00

%Mwi:Xj

i = 0 to 65535

j=0 to 15

%MW00000:X00

i = 1 to 65536

j=0 to 15

%MW00001:X00

 

 

NOTE

Supported Devices Symbol and Terms

IEC61131 Syntax Address Mapping

Address mapping in BLUE is as follows. %MD and %MF use two sequential words form the specified address.