Specifications

App - 5
Appendix 2.3 Precautions when changing over from the MELSECNET/10 remote I/O network to the
MELSECNET/H remote I/O network.
The following describes the precautions to take when switching from the AnUCPU,
QnACPU MELSECNET/10 remote I/O network to the QCPU MELSECNET/H remote
I/O network.
(1) Cannot be mixed with other network modules.
The MELSECNET/10 network modules and MELSECNET/H network modules
cannot be mixed.
• The MELSECNET/H remote I/O modules cannot be connected to the
MELSECNET/10 master modules.
• The MELSECNET/10 remote I/O modules cannot be connected to the
MELSECNET/H master modules.
When changing remote I/O modules, use MELSECNET/H for all network modules.
(2) Switch settings of the network module
The network number setting switches and condition setting switches for the
MELSECNET/10 network modules are not found on the MELSECNET/H network
module.
These settings must be made by the network parameters.
(3) Correction of remote master station network parameters
The network parameters for the remote master station require the corrections
shown in (2) above.
(4) Setting of parameters to remote I/O station
• The I/O assignment settings set by the network parameters of the
MELSECNET/10 remote I/O network master module are set by the remote I/O
module PLC parameters on the MELSECNET/H remote I/O network.
• When changing the intelligent function modules mounted to the remote I/O
station, it is necessary to make switch settings using the remote I/O station PLC
parameters depending on model. For details, refer to the User's Manual for the
intelligent function module being used.
(5) Correcting the sequence programs
It is not necessary to correct the sequence programs, such as the interlock program
that use a link special relay or a link special register and the program for accessing
other stations using the data link instructions.
However, the data link instructions (ZNFR/ZNTO instructions) used for accessing
the buffer memory of the intelligent function module of the remote I/O station and
the data link instructions (ZNRD/ZNWR instructions) used for reading/writing of the
other station word device cannot be used on the MELSECNET/H remote I/O
network. Accordingly, on the MELSECNET/H, rewrite the ZNFR/ZNTO instructions
to REMFR/REMTO instructions and the ZNRD/ZNWR instructions to
READ/WRITE instructions.
• The link special relays and link special register operations used in the
MELSECNET/10 remote I/O network are the same as that in the MELSECNET/H
network.
(6) Distance between optical fiber cable stations
When the remote I/O network speed is changed to 25 Mbps depending on the
optical fiber cable, the distance between stations will become shorter.
In this event, set the communication speed to 10Mbps, or rewire the system with
different optical fiber cables.
(7) The multiplex master and parallel master functions cannot be used since they are
not supported.