Mitsubishi Electric SW0DNC-MNETH-B User Manual page 48

4 FUNCTION
Link special
relay/register
SB20
SB47
SB49
SB70
SW70 to 73
SB74
SW74 to 77
SB7A, 7B
SW1FC to SW1FF
1: Stations in other than the redundant CPU system configuration are OFF.
4 - 4
(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
Indicates the communication status between
MELSECNET/H board and personal computer.
Shows the baton pass execution status of the
host.
Shows the cyclic transmission status of the host.
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.
Shows the baton pass execution status of each
station.
Each bit corresponds to the status of each
station.
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.
Shows the cyclic transmission status of each
station.
Each bit corresponds to the status of each
station.
Shows the low-speed cyclic transmission status.
The transmission completion is indicated by the
on/off status of either bit SB7A or 7B.
Shows the redundant CPU system status
(Control or Standby) of each station.
Each bit corresponds to each station status.
Description
Signal status
Off
Normal Abnormal
The baton pass is The baton pass is
being executed
Normal Abnormal
The baton pass is Occurrence of
being executed on communication
all stations stop station
The baton pass is The baton pass is
being executed
All stations Occurrence of
normal abnormal station
Normal Abnormal
SB7A
SB7B
Low-speed cyclic interval
1
Control system
Standby system
MELSEC
On
stopped
stopped
4 - 4