INTRODUCTION
1 - 15
1
(2) Adding the QCPU to the existing network system
This section describes the methods for replacing the existing MELSECNET(II) network with the
MELSECNET/10 simultaneously and adding the QCPU in the system.
*1 Twisted pair cables can be used by replacing the remote I/O station with a normal station and configuring a PLC to PLC
network.
Existing network configuration Replaced network configuration
Item Advantage Outline Reference
Cost
Cable
laying
Optical
cable
• The existing cable can be utilized, however; since one
station has been added, laying change of before and after
the added station is required.
• Due to restrictions on station-to-station distance in some
cable types, check the cable type if the distance is long.
Section 2.2.1
(1)
Coaxial
loop
• Change from coaxial loop to coaxial bus is required.
One side of the existing coaxial cable can be utilized.
• Due to restrictions on overall cable distance, if the distance
is long, repeater module is required.
Section 2.2.1
(2)
Twisted
pair
• Since the twisted pair cables can be used for the
MELSECNET/H only, all stations must be replaced with
QCPU.
• When replacing the stations with QCPU step-by-step or
replacing with the remote I/O network, change the twisted
pair cables to coaxial bus cables. (The twisted pair cables
cannot be used for the remote I/O network.)
*1
Section 2.2.1
(3)
Network module
• All the existing stations are required to be replaced with the
MELSECNET/10 modules.
-
Modification
on software
Only first half set
in second tier
system
• Data link is possible by only changing the existing network
parameter according to the added station(s).
Section 2.5.1
(1)
Latter half set in
second tier system
• Station-specific parameter setting is required.
• If the AnN, AnA, or AnSCPU (excluding AnUS(H)CPU)
exists, newly set network parameters and modify the
program.
Section 2.5.1
(1)
Three-tier system
• Since the second tier and the third tier is separate network,
reviewing the network parameter and program is required.
Section 2.5.3,
Section 2.5.4
Extensibility
• By simultaneous replacement to the MELSECNET/10, an
arbitrary station can be replaced with the QCPU.
• If modification on software is required, modifying
parameters and a program at addition of the first module
allows data link. At addition of the second module or later,
data link is possible by only changing the existing network
parameter according to the added station.
-
A6
A5A3
A2
A1
MELSECNET(II)
A4
A6
Q7A3
A2
A1
MELSECNET/10
A5
A4
Added QCPU
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