Mitsubishi Electric Melsec A Series - 1.1.3 Replacement selection points

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INTRODUCTION
1
1.1.3 Replacement selection points
To replace any one stations in the existing MELSECNET(II) with the QCPU or to add the QCPU in the
system, replace the network used with the MELSECNET/10 simultaneously.
(1) Replacing the existing A/AnS/QnA/QnASCPU with the QCPU
This section describes the methods for replacing the network used with the MELSECNET/10
simultaneously and replacing any one stations in the existing MELSECNET(II) with the QCPU.
: No restrictions, : Some restrictions, : Many restrictions
*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
• Laying change is not required since the existing network
cable can be used without change.
• 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
• Setting made to the existing network parameter can be
utilized without change.
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,
replacing arbitrary station with the QCPU is possible.
• If modification on software is required, modifying it at
replacement of the first module allows omitting modification
to the second module or later.
-
A6
A5A3
A2
A1
MELSECNET(II)
A4
A6
Q5A3
A2
A1
MELSECNET/10
A4
Replaced QCPU