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13 JC-IO USERS MANUAL EM-9044-B
3.4 Modbus/TCP
The JC-IO-N supports Modbus/TCP as I/O communication, so communicable with Modbus/TCP supported
remote I/O and PLCs is possible.
Table 12. Modbus/TCP
ITEM DESCRIPTION
Request
TYPE OPERATION
Read Coil Status (01) Reading out Coil Status(0X)
Read Input Status (02) Reading out Input Status(1X)
Read Holding Register (03) Reading out Holding Register(4X)
Read Input Register (04) Reading out Input Register(3X)
Force Multiple Coils (15) Write to Coil(0X)
Preset Multiple Registers (16) Write to Holding Register(4X)
Internal register
TYPE SELECTABLE Modbus REGISTER TYPE
L 3X, 4X
S 3X, 4X
B 0X, 1X
P 3X, 4X
Communication error output 0X
unit identification number
Set the common number with connection (C), or set individual number for each internal
register.
Refer to the web page of Modbus Organization for details of Modbus/TCP.
Figure 4.
In case the one device has one IP address, such as
the R7E, set a common unit identification number to
Connection.
JC-IO-N
R7E
192.168.1.100
JC-IO-N
GR8-EM
Unit identification number: 1
R7M
Unit identification number: 2
R7M
Unit identification number: 3
R7M
Modbus RTU
192.168.1.200
In case the multiple devices share a one IP address,
such as the R7M connection via GR8-EM, set the unit
identification number for each internal register by the
same Connection.
Unit Identification Number