Modbus/Tcp - M-system JC-IO User Manual

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