Mitsubishi Electric MELSEC-A Series Manual page 32

1
INTRODUCTION
(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.
Existing network configuration
A2
A3
Item
Cable
laying
Cost
Network module
Only first half set
in second tier
system
Modification
Latter half set in
on software
second tier system
Three-tier system
Extensibility
*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.
1
- 15
A1
A6
MELSECNET(II)
A5
A4
Advantage
• The existing cable can be utilized, however; since one
station has been added, laying change of before and after
Optical
the added station is required.
cable
• Due to restrictions on station-to-station distance in some
cable types, check the cable type if the distance is long.
• Change from coaxial loop to coaxial bus is required.
Coaxial One side of the existing coaxial cable can be utilized.
loop • Due to restrictions on overall cable distance, if the distance
is long, repeater module is required.
• Since the twisted pair cables can be used for the
MELSECNET/H only, all stations must be replaced with
QCPU.
Twisted
• When replacing the stations with QCPU step-by-step or
pair
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.)
• All the existing stations are required to be replaced with the
MELSECNET/10 modules.
• Data link is possible by only changing the existing network
parameter according to the added station(s).
• 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.
• Since the second tier and the third tier is separate network,
reviewing the network parameter and program is required.
• 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.
Replaced network configuration
A1
A6
A2
MELSECNET/10
A3 Q7
A4 A5
Outline
Added QCPU
Reference
Section 2.2.1
(1)
Section 2.2.1
(2)
Section 2.2.1
(3)
*1
-
Section 2.5.1
(1)
Section 2.5.1
(1)
Section 2.5.3,
Section 2.5.4
-