In the case of slave station (PC 01 to 77(8))

·Communication monitor flag

This flag is used to monitor the communication condition with other stations. Non-connected station keeps this flag as “OFF.”

Flag

Condition for flag operation

Flag operation

 

When the link start switch is set to “01(H),” and at communicating with a

ON

Own

master station normally.

 

station

When the link start switch is set to “00(H).”

 

flag

 

OFF

When link start switch “00(H)” of the master station is OFF.

 

 

 

 

 

Flag

Condition for flag operation

Flag operation

Other

Normal communication with each station.

ON

Specific

Stopped communication or unable to

 

 

station

station’s

communication with each station.

 

OFF

 

flag

 

 

Communication monitor flag (1) of the master

 

 

All stations

 

 

 

station is turned “OFF.”

 

 

 

 

·Operation condition monitor flag [1]

This flag is used to monitor the operation condition of each station when the communication with each station is normal.

Non-connected station keeps this flag as “OFF.”

Flag

Condition for flag operation

Flag operation

Own

Communication monitor flag (1) of the own station is turned “ON.”

ON

station

 

 

Communication monitor flag (1) of the own station is turned “OFF.”

OFF

flag

 

 

 

 

 

Flag

Condition for flag operation

Flag operation

9

 

 

Each station is operating.

ON

Specific

 

 

 

 

 

 

 

 

 

 

Other

Each station stops operation (not by an error cause).

 

station

 

 

station’s

 

OFF

 

 

 

Communication monitor flag (1) of the own station

 

 

 

All slave

 

 

flag

is turned “OFF.”

 

stations

 

 

 

Slave station that communication monitor flag (1)

Not specified

 

 

 

is turned to “OFF.”

 

 

 

 

 

Even if the own station PC has stopped operation normally or by an error, the JW-20CM turns “ON” this flag while communicating.

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