Mitsubishi Electric Melsec A Series - 2.2.2 Cable performance comparisons

REPLACEMENT OF MELSECNET (II) AND /B (PLC TO PLC NETWORK)
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2
2.2.2 Cable performance comparisons
(1) Optical fiber cable
(a) Overall distance
The overall distance (30km) does not differ according to the optical fiber cable.
(b) Distance between stations
1) SI optical fiber cable
: Compatible, : Partial change required, × : Incompatible
*1 When the distance between stations does not satisfy the MELSECNET/H specifications, either change the type of optical
fiber cable, or install a gateway station midway along existing cables.
*2 When the distance between stations does not satisfy the MELSECNET/H specifications, use at a communication speed of
10 Mbps, change the type of optical fiber cable, or install a gateway station midway along existing cables.
2) GI optical fiber cable
: Compatible, : Partial change required, × : Incompatible
Modulation
method (Encoding
method)
(Modulation method) NRZI method
(Encoding method)
NRZI coding
-
-
(Encoding method)
Manchester code
Nothing to be noted though
the modulation method
differs.
Transmission
format
HDLC standards (frame format)
Error control
system
CRC(X
16
+X
12
+X
5
+1) and retry by a time over
RAS function Diagnostic function for checking local link lines
Occupied I/O
points
Standalone:32 points per slot (I/O
assignment: special 32 points)
32 points per slot (I/O assignment: intelli.
32 points)
Type
MELSECNET ( II )
module
(optical loop)
MELSECNET/H module
(optical loop)
Compat-
ibility
Precautions for
replacement
10Mbps 25Mbps
SI optical fiber cable
(Type: A-2P-)
L type 1km 500m 200m
Refer to
*1
below.
H type 500m 300m 100m
SI optical fiber cable
(Type: AN-2P-)
1km 500m 200m
H-PCF optical fiber cable 1km 1km 400m
Refer to
*2
below.
Broad-band H-PCF optical fiber cable - 1km 1km
QSI optical fiber cable - 1km 1km
Type
MELSECNET ( II ) module
(optical loop)
MELSECNET/H module
(optical loop)
Compat-
ibility
Precautions for replacement
GI optical fiber cable 2km 2km
Item
Specifications
Compat-
ibility
Precautions for
replacement
MELSECNET/B module MELSECNET/H module
Twisted pair
Optical loop
(QJ71LP21-25)
Coaxial bus
(QJ71BR11)