INTRODUCTION
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1.1.2 Transition procedure to a Q series MELSECNET/H system
The following shows the transition procedure to a Q series system.
• Simultaneous replacement with MELSECNET/10
The entire MELSECNET(II) system is replaced with a MELSECNET/10 system with the wiring left as
it is, and then the A/AnS/QnA/QnAS series system is replaced with the Q series system in stages.
Note, however, that the gradual transition cannot be made in a network where both of the A/AnS/QnA/
QnAS series system and the Q series system exist. This is because the MELSECNET/H twisted bus
system supports only the Q series system.
Notice
The A/QnA series MELSECNET/10 network modules were discontinued. The AnS/QnAS series
MELSECNET/10 network modules and the A-A1S module conversion adapter are produced continuously. The
MELSECNET(II) system of the A/QnA series can be replaced with the MELSECNET/10 system
simultaneously by using those products.
(1) MELSECNET(II), /B master station
Replace with the Q series system, and change to the MELSECNET/10 control station.
(2) MELSECNET(II), /B local station
For the stations to be replaced with a Q series system, replace the programmable controllers with the Q series,
and set the stations to MELSECNET/10 normal stations.
For the stations not to be replaced with a Q series system, replace the MELSECNET(II), /B data link modules
with the MELSECNET/10 network modules.
(3) Replacement of an A/AnS series system in stages
The A/AnS series system is replaced with a Q series system in stages to shift the system to a Q series system.
MELSECNET
(II)
Q2
Q1
Q5
Q3 Q4
MELSECNET
/10(H)
A5A2
A1
A3 A4
Part of the A/AnS series
system is replaced
with a Q series system,
and the network is
replaced with
MELSECNET/10.
[System before transition] [System after transition]
A2
Q1
A5
Q3 A4
An
A series system
MELSECNET
/10
[Transition steps]
The A/AnS series
system is replaced
with the Q series
system in stages.
Qn
Q series system
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