Mitsubishi Electric MELSEC-A Series Manual page 116

3
REPLACEMENT OF MELSECNET (II) AND /B (REMOTE I/O NETWORK)
(b) Modules for GI optical cable
Item
Max. 2048 points and max. number of
X/Y I/O points of CPU module on master
station
Maximum
number of B
link points
per
network
• (MELSECNET mode) 1024 points
W • (MELSECNET II composite mode)
• (MELSECNET mode) 1024 bytes
Master • (MELSECNET II composite mode)
Maximum
station link parameter First half: 1024 bytes
number of
link parameter Second half: 1024 bytes
link points
per
Remote
station
I/O 512 bytes
station
Maximum number of
512 points
I/O points per station
Communication
1.25 Mbps
speed
Number of stations
65 stations (Master station: 1, local
connected in one
station + remote I/O station: 64)
network
Applicable cable GI optical cable
Overall distance 10 km
Distance between
GI optical cable: 2km
stations
Maximum number of
networks
Communication
Half duplex bit serial method
method
Transmission
Duplex loop
method
Modulation method
(Modulation method) CMI method
(Encoding method)
Transmission format HDLC standards (frame format)
Error control system CRC (X
• Loop-back function due to error detection or broken cable
RAS function
• Diagnostic function for checking local link lines
(Master station)
Number of occupied CPU integrated type: 0 point
I/O points Standalone:32 points per slot (I/O
assignment: special 32 points)
3
- 4
Specifications
MELSECNET (II) module
Optical loop
-
4096 points
-
16 12 5
+X +X +1) and retry by a time over
: Compatible,
MELSECNET/H module
Optical loop(QJ71LP21G, QJ72LP25G)
8192 points
16384 points
(Remote master station  remote I/O
station: 8192 points,
remote I/O station  remote master
station: 8192 points)
16384 points
(Remote master station  remote I/O
station: 8192 points,
remote I/O station  remote master
station: 8192 points)
Remote master station  remote I/O
station
{(LY + LB)  8 + (2 × LW)}
1600 bytes
Remote I/O station  remote master
station
{(LX + LB)  8 + (2 × LW)}
1600 bytes
4096 points
10 Mbps
65 stations (Remote master station: 1,
remote I/O station: 64)
GI optical cable
30 km
GI optical cable: 2km
239
Token ring method
(Encoding method) NRZI coding
(Master station)
32 points per slot (I/O assignment: intelli.
32 points)
: Partial change required, × : Incompatible
Compat-
Precautions for replacement
ibility
Set the PLC to PLC network to
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 the master station is
replaced from a CPU
integrated type, one new slot
(32 points) is required.