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App - 4
Appendix 2.2 Precautions when replacing the AJ71QLP21/AJ71QBR11 and the
A1SJ71QLP21/A1SJ71QBR11 with the QJ71LP21/QJ71LP21-25/QJ71BR11
The following are the precautions when replacing the QnACPU MELSECNET/10
network system with the QCPU MELSECNET/H network system:
(1) Switch settings of the network module
The MELSECNET/H network module does not have a network number setting
switch, a group number setting switch and a condition setting switch (default
parameter setting) of the MELSECNET/10 network module.
Thus, these switches must be set with the network parameters.
(2) Correcting the network parameters
The corrections as described in item (1) above are required for the network
parameters.
In particular, when the default parameters are set in SW3 of the network module,
there will be no parameter information about the network after converting from QnA
to Q with GX Developer.
When the default parameter is used, make sure to set the network parameters with
GX Developer after the conversion.
(3) 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.
• The operations of the link special relays and link special registers used in the
MELSECNET/10 network are the same as those in the MELSECNET/H.
• The interlock link special relay is required to use the data link instruction in the
MELSECNET/10 network, however, it is not required for the MELSECNET/H
network. In addition, the sequence program will operate normally even if the
interlock link special relay remains in the sequence program after conversion.
(4) Distance between optical fiber cable stations
The distance between stations will become shorter when changing network
systems to a communication speed of 25Mbps depending on the optical fiber cable
in use.
In this event, set the communication speed to 10Mbps, or rewire the system with
different optical fiber cables.