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4.2.7 Link relay (B)
The link relay (B) is a relay on the CPU module side, and it is used for refreshing the link relay (LB) data of another
module such as a MELSECNET/H network module to the CPU module or refreshing the CPU module data to the link
relay (LB) of the MELSECNET/H network module.
(1) Allowable number of normally open or closed contacts
There are no restrictions on the number of normally open or closed contacts used in a program, as long as the
program capacity is not exceeded.
(2) Using the link relay in the network system
Network parameters must be set.
The link relay range areas that are not set by network parameters (not used for a network system such as a
MELSECNET/H network) can be used as the internal relay or latch relay.
• Link relay range where no latch is performed••••••Internal relay
• Link relay range where latch is performed••••••••••Latch relay
Link relayLink relay
B0 LB0
CPU module MELSECNET/H network module
Link refresh
setting range
Link refresh
X0
B0
T0
Y20
X1
B0
B100
X2
B0
B1FFF
SET B0
K20
No restrictions on the quantity used.
B0 is set to on when X0 turns on from off.
Link relay (B0) can be set to on only for use inside
the CPU module, and not for output to the
outside.
The on/off information of B0 is output from the
output module to the external device.
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