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12-3
[2] In the case of a master station
(1) Communication monitor flag
This flag is used to monitor the communication condition with other stations. Non-connected station
keeps this flag as "OFF."
The master station periodically executes communication recovery operation with the communication
error slave station. When the error situation is recovered, the master station returns to normal
communication.
(2) Operation condition monitor flag [1]
This flag is used to monitor the operation condition of slave stations when the communication with
each slave station is normal.
Non-connected station keeps this flag as "OFF."
* Even if a master station PC has stopped operation normally or by an error, the JW-21MN turns
"ON" this flag while communicating.
(3) Operation condition monitor flag [2]
This flag is used to monitor the abnormal stop of each slave station when the communication with
each slave station is normal.
Non-connected station keeps this flag as "OFF."
* Even if a master station PC has stopped operation normally or by an error, the JW-21MN turns
"ON" this flag while communicating.
Flag
Improper setting of parameter, BCC check error, or other errors.
When the parameter address 007777(8) of the master station is set to "00(H)."
Condition for flag operation
Own
station
flag
(master
station)
When the parameter address 007777
(8) of the master station is set to "01(H),"
and the master station is operating normally.
Flag operation
ON
OFF
Communication monitor flag (1) of the master
station is turned "OFF."
Flag
Condition for flag operation
Flag operation
Other
station’s
flag
(01 to 77)
Stopped communication or unable to
communicate with slave stations.
Specific
slave
station
All slave stations
ON
Normal communication with slave stations.
OFF
Slave station that communication monitor flag (1) is
turned to "OFF."
Flag operation
Condition for flag operation
Flag
Not specified
Own
station flag
(master
station)
Communication monitor flag (1) of the master station is turned "OFF."
Communication monitor flag (1) of the master station is turned "ON."
All slave
stations
Specific
slave
station
Flag operation
Other
station’s
flag
(01 to 77)
OFF
Flag
Condition for flag operation
Communication monitor flag (1) of the master station
is turned "OFF."
Each slave station is normal.
Any of the slave stations is faulty (caused to be
stopped abnormally).
ON
ON
OFF
Flag
Flag operation
Condition for flag operation
Slave station that communication monitor flag (1)
is turned to "OFF."
Communication monitor flag (1) of the master station is turned "ON."
Communication monitor flag (1) of the master station is turned "OFF."
Own
station flag
(master
station)
Other
station’s
flag
(01 to 77)
Flag
Condition for flag operation
Slave station stops operation (not by an error cause).
Specific
slave
station
All slave stations
Not specified
OFF
ON
Slave station is operating.
Communication monitor flag (1) of the master
station is turned "OFF."
Flag operation
ON
OFF