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MELSEC-Q
3 SPECIFICATIONS
(4) SB/SW when a communication error station/communication stop
station occurs on the network
The status of whether there are any communication error/communication stop
stations on the network can be checked with the link special relay/register
(SB/SW).
Use them as interlocks for programs.
Link special relays and registers
Link special
relay/register
Description
Signal status
Off On
SB0047 Shows the baton pass execution status of the host.
The baton
pass is being
executed
The baton
pass is
stopped
SB0049 Shows the data link status of the host. Normal Abnormal
SB0070
Shows the baton pass execution status of all
stations (including the host). However, it only shows
the status for the number of stations set with
parameters.
The baton
pass is being
executed on
all stations
Occurrence
of
communicati-
on stop
station
SW0070 to
0073
Shows the baton pass execution status of each
station.
Each bit corresponds to the status of each station.
The baton
pass is being
executed
The baton
pass is
stopped
SB0074
Shows the cyclic transmission status of all stations
(including the host). However, it only shows the
status for the number of stations set with
parameters.
All stations
normal
Occurrence
of abnormal
station
SW0074 to
0077
Shows the cyclic transmission status of each station.
Each bit corresponds to the status of each station.
Normal Abnormal