Micro/Premium/Twido/Quantum/Momentum Series

Modbus SIO Master

Device	Bit Address	Word Address	32 bits	Notes
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

Below is the list of Supported Function Code.

Function Code (Hex)	Description
FC01 (0x01)	Reads the ON/OFF status of coils (0X references) in the slave.
FC02 (0x02)	Reads the ON/OFF status of discrete inputs (1X references) in the slave.
FC03 (0x03)	Reads the binary content of holding registers (4X references) in the slave.
FC04 (0x04)	Reads the binary content of input registers (3X references) in the slave.
FC05 (0x05)	Forces a single coil (0X references) to either ON or OFF
FC06 (0x06)	Presets a value into a single holding register (4X references).
FC15 (0x0F)	Forces each coil (0X references) in a sequence of coils to either ON or OFF.
FC16 (0x10)	Presets values into a sequence of holding registers (4X references).

NOTE

FC15 / FC16 will be used for writing. In case if the connected controller do not support these function codes, then FC05 / FC06 will be used.

The following table gives the equivalences between the Modbus syntax and the IEC61131 syntax.

NOTE

The two areas 100000 and 300000 are not accessible with the IEC syntax.
Once you change the project which you have setup Discrete Input Register to IEC 61131 Syntax, the address will be invalid.
When the [Base Address] check box is selected for a 8-bit data type array or structure, and a %MW or %KW address is specified as the device address, the bottom byte and top byte of consecutive addresses is allocated to each element.
Example: BYTE type array Var1
Var1[0]...%MW1:X0
Var1[1]...%MW1:X8
Var1[2]...%MW2:X0
Please refer to the precautions on manual notation for icons in the table.

Address mapping in BLUE is as follows. %MD and %MF use two sequential words form the specified address. The %KW, %KD, and %KF are mapped similarly.