Mitsubishi Electric MELSEC-A Series Manual page 119

3
REPLACEMENT OF MELSECNET (II) AND /B (REMOTE I/O NETWORK)
Item
Communication
Half duplex bit serial method
method
Transmission
Single bus
method
Modulation method
(Modulation method) NRZI method
(Encoding method)
Transmission format HDLC standards (frame format)
Error control system CRC (X
RAS function Diagnostic function for checking local link lines
(Master station)
Number of occupied
Standalone: 32 points per slot (I/O
I/O points
assignment: special 32 points)
Specifications
MELSECNET/B module
Twisted pair
(QJ71LP21-25)
Token ring method
Duplex loop
(Encoding method)
NRZI coding
16 12 5
+X +X +1) and retry by a time over
(Master station)
32 points per slot (I/O assignment: intelli.
32 points)
: Compatible,
MELSECNET/H module
Optical loop Coaxial bus
(QJ71BR11)
-
- Single bus
-
(Encoding method)
-
Manchester code
: Partial change required, × : Incompatible
Compat-
Precautions for replacement
ibility
Nothing to be noted though the
communication method differs.
Nothing to be noted though the
modulation method differs.
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