Specifications

MELSECNET/II•B

MELSECNET II

MELSECNET/B

■ Choice of cable

The MELSECNET system offers a choice of four different

varieties of cable. These range from the low cost twisted

pair cable bus to dual coaxial cable to the highly reliable

GI dual fiber optic cable network.

MELSECNET/B refers to the twisted pair cable bus system,

while MELSECNET II to both coaxial and fiber optic

systems. The software of both systems, however, provides

the same range of functions.

■ Loopback function (MELSECNET II only)

The MELSECNET II data link system uses two parallel cable

loops for connecting PLC stations, a forward (main) loop

and a reverse (sub) loop. In the event of a break in the main

loop, communications will be automatically switched to the

sub loop maintaining the data link system. If there is a

break in both loops, communications will continue among

the remaining connected stations as shown.

■ Link up to 32 or 65 stations

In MELSECNET II system, one master and 64 slave stations

can be connected per network. For MELSECNET/B, one

master and 31 slave stations can be connected per network.

MELSECNET II, MELSECNET/B

■ A high speed, high reliablity

data link system

■ High speed transmission

A coaxial or fiber optic cable system is capable of

transmitting data at 1.25M bps speed while the twisted pair

cable system can transmit at 1M bps maximum.

Sub Loop

Main Loop

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