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4.1 Replace MELSECNET(ΙΙ) with MELSECNET/10
4.1.2 Upgrade to MELSECNET/H network system utilizing existing MELSECNET/B twisted pair cable
Solution and Benefit
When replacing A (Large Type) Series CPU with Q Series CPU in a MELSECNET/B data link
system, the network can be effortlessly updated to twisted bus type MELSECNET/H (PLC to PLC
network) because the existing MELSECNET/B twisted pair cable can be directly utilized. (New cable
installation is not required.)
The following is an example of replacing MELSECNET/B with twisted bus type MELSECNET/H (PLC to PLC
network) utilizing the existing twisted pair cable.
● Instructions
(1) Replace all A Series CPUs found in the existing MELSECNET/B system with Q Series CPUs.
(2) Utilize the existing MELSECNET/B twisted pair cable.
(3) Modify the terminals of the network modules because the cable connection method has been changed from
screw terminal block type to spring clamp terminal block type.
(1) System configuration example
Current configuration
After replacement
Control station
* The existing MELSECNET/B twisted pair cable and terminating resistor ar e utilized.
(Terminal modification is required.)
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Existing MELSECNET/B (ACPU＋AJ71AT21B)
Master station
MELSECNET/H (PLC to PLC network)(QCPU+QJ71NT11B)
0
0
1
1
2
2
3
3
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6
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8
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9
A
A
B
B
C
C
D
D
E
E
F
F
Local station
Upgrade to Q Series modules
Replace
Normal station
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1
1
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2
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A
A
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B
C
C
D
D
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E
F
F
84
Local station
Normal station
0
0
1
1
2
2
3
3
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5
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6
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7
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8
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9
A
A
B
B
C
C
D
D
E
E
F
F
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