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In the case of a master station (PC 00)
· 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.
· 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-20CM
turns “ON” this flag while communicating.
Flag
Improper setting of parameter, BCC check error, or other errors.
When the link start switch is set to “00(H).”
Condition for flag operation
Own
station
flag
(master
station)
When the link start switch 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
Flag
Flag operation
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)
Condition for flag operation
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.”
Slave station that communication monitor flag (1)
is turned to “OFF.”
Flag operation
ON
OFF