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MELSEC
4 FUNCTION
(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.
For interlock program examples, refer to the following manual.
Q Corresponding MELSECNET/H Network System
Reference Manual (PLC to PLC network)
Link special relays and registers
Signal status
Link special
relay/register
Description
Off On
SB20
Indicates the communication status between
MELSECNET/H board and personal computer.
Normal Abnormal
SB47
Shows the baton pass execution status of the
host.
The baton pass is
being executed
The baton pass is
stopped
SB49
Shows the cyclic transmission status of the host.
Normal
Abnormal
SB70
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
communication
stop station
SW70 to 73
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
SB74
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
SW74 to 77
Shows the cyclic transmission status of each
station.
Each bit corresponds to the status of each
station.
Normal Abnormal
SB7A, 7B
Shows the low-speed cyclic transmission status.
The transmission completion is indicated by the
on/off status of either bit SB7A or 7B.
SB7A
SB7B
Low-speed cyclic interval
SW1FC to SW1FF
Shows the redundant CPU system status
(Control or Standby) of each station.
Each bit corresponds to each station status.
Control system
1
Standby system
1: Stations in other than the redundant CPU system configuration are OFF.
Summary of Contents for Q80BD-J71BR11
Page 2: ......
Page 24: ...A 22 A 22 MEMO ...
Page 50: ...4 6 4 6 MELSEC 4 FUNCTION MEMO ...
Page 92: ...6 36 6 36 MELSEC 6 PROCEDURE AND SETTINGS UP TO THE POINT OF OPERATION MEMO ...
Page 132: ...10 2 10 2 MELSEC 10 MELSEC DATA LINK LIBRARY MEMO 10 ...
Page 138: ...11 6 11 6 MELSEC 11 PROGRAMMING MEMO ...
Page 164: ...12 26 12 26 MELSEC 12 APPLICATION FUNCTIONS MEMO ...
Page 166: ...13 2 13 2 MELSEC 13 ERROR CODE MEMO 13 ...
Page 223: ......