Mitsubishi Electric MELSEC-A Series Manual page 41

2
REPLACEMENT OF MELSECNET (II) AND /B (PLC TO PLC NETWORK)
(b) Modules for GI optical cable
Item
Max. 2048 points and max. number of I/O
X/Y
points of CPU module on master station
Maximum • (MELSECNET mode) 1024 points
number of • (MELSECNET II mode),
B
link points (MELSECNET II composite mode)
per network 4096 points
• (MELSECNET mode) 1024 points
• (MELSECNET II mode),
W
(MELSECNET II composite mode)
4096 points
• (MELSECNET mode) 1024 bytes
Maximum number • (MELSECNET II mode),
of link points per (MELSECNET II composite mode)
station First half: 1024 bytes
Second half: 1024 bytes
Communication
speed
Number of stations
connected in one
local station + remote I/O station: 64)
network
Applicable cable
Overall distance
Distance between
stations
Maximum number
of networks
Communication
method
Transmission
method
Modulation
method (Encoding
method)
Transmission
format
Error control
system
• Loop-back function due to error detection or broken cable
RAS function
• Diagnostic function for checking local link lines
Number of CPU integrated type: 0 point,
occupied I/O Standalone:32 points per slot (I/O
points assignment: special 32 points)
Specifications
MELSECNET ( II ) module
Optical loop
1.25Mbps
65 stations (master station: 1,
GI optical cable
10km
GI optical cable: 2km
-
Half duplex bit serial method
Duplex loop
(Modulation method) CMI method
HDLC standards (frame format)
16 12 5
CRC(X +X +X +1) and retry by a time over
: Compatible,
MELSECNET/H module
Optical loop (QJ71LP21-25)
(MELSECNET/10 mode),
(MELSECNET/H mode),
(MELSECNET/H extended mode) 8192
points
• (MELSECNET/10 mode) 8192 points
• (MELSECNET/H mode),
(MELSECNET/H extended mode)
16384 points
• (MELSECNET/10 mode) 8192 points
• (MELSECNET/H mode),
(MELSECNET/H extended mode)
16384 points
• (MELSECNET/10 mode),
(MELSECNET/H mode)
{(LY + LB)  8 + (2 × LW)}
2000
bytes
• (MELSECNET/H extended mode)
{(LY + LB)  8 + (2 × LW)}
35840
bytes
10Mbps
64 stations (control station: 1 normal
station: 63)
30km
239
Token ring method
(Encoding method) NRZI coding
32 points per slot (I/O assignment: intelli.
32 points)
: Partial change required, × : Incompatible
Compat- Precautions for
ibility replacement
When the number of bytes
exceeds 2000, mount two
modules having the same
network No., or set all
modules on the network in the
MELSECNET/H extended
mode.
• Set the remote I/O network
to a separate network.
• For the 65th station,
configure a separate
network.
New MELSECNET/H
parameter
(mandatory)
Nothing to be noted though
the communication method
differs.
Nothing to be noted though
the modulation method
differs.
When replacing from a CPU
integrated type, an additional
slot (32 points) is required.
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