Modbus SIO Master (FCN/FCJ Series)

Modbus SIO Master

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Connection Configuration
Communication Settings
Cable Diagram
Supported Devices

Supported Function Code
IEC61131 address syntax

Connection Configuration

1:1 Connection
1:n Connection
NOTE
- Maximum number of External Devices is 31.

Communication Settings

Examples of communication settings of the Display and the External Device, recommended by Pro-face, are shown.

WARNING

UNINTENDED EQUIPMENT OPERATION

Read and understand the instructions in this section to ensure data is properly transferred.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

Cable Diagram

The following cable diagrams may be different from cable diagrams recommended by External Device Manufacturer.

Please be assured there is no operational problem in applying the cable diagram shown in this manual.

The FG pin of the External Device body must be grounded according to your country's applicable standard. Refer to your External Device manual for details.
SG and FG are connected inside the Display. When connecting the External Device to SG, design your system to avoid short-circuit loops.
Connect an isolation unit if the communication is not stable due to noise or other factors.

Supported Devices

Range of supported device address is shown in the table below. Please note that the actually supported range of the devices varies depending on the External Device to be used. Please check the actual range in the manual of your External Device.

WARNING

UNINTENDED EQUIPMENT OPERATION

Do not simultaneously write to the same register from Display and External Device program.
Do not write 16-bit word values to registers being accessed in a bitwise manner.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

Supported Function Code

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.

IEC61131 address syntax

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

Device	Modbus address syntax			IEC61131syntax
	Modbus address syntax			Format	0-based		1-based
	Format	Range	First element	Format	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 to15	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 to15	400001,00	%MWi:Xj	i=0 to 65535 j=0 to 15	%MW00000:X00	i=1 to 65535 j=0 to15	%MW00001:X00

NOTE

Please refer to the precautions on manual notation for icons in the table.
Supported Devices Symbol and Terms
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.