APPX
Appendix 4 Buffer Memory
77
A
Data link status of each station
■Data link status of each station (Un\G4104 to Un\G4105)
Stores the slave station data link status for each station No.
*1 This status includes the case where a slave station has not responded to the first request from the master station due to a power-off of
the slave station. (The slave station is not judged as a faulty station because the data link status is not determined.)
• Only the bit of the start station number turns on.
• The status is not stored for the reserved stations and the station numbers after the maximum station
number.
• This buffer memory can be used to monitor errors in slave stations, connected cables, and a connected
hub.
Total number of connected stations
■Total number of connected stations (Un\G4112)
The total number of connected stations set in GX Works3 is stored. (Page 32 Network Configuration Settings)
Reserved station specification status of each station
■Reserved station specification status of each station (Un\G4113 to Un\G4114)
Stores the setting state of the reserved station set with GX Works3. (Page 32 Network Configuration Settings)
• Only the bit of the start station number turns on.
• The status is not stored for the reserved stations and the station numbers after the maximum station
number.
Link scan information (group number 1)
■Link scan information (group number 1) (Un\G4117 to Un\G4119)
Link scan information of group number 1 is stored.
Address bit Station number Description
Un\G4104 b0 1 station • On: Faulty station
• Off: Normally operating station
b1 2 station
b15 16 station
Un\G4105 b0 to b15 17 to 32 station
Address bit Station number Description
Un\G4113 b0 1 station • On: Reserved station
• Off: Other than reserved station
b1 2 station
b2 3 station
b15 16 station
Un\G4114 b0 to b15 17 to 32 station
Address Name Description
Un\G4117 Maximum link scan time (Unit: ms) The maximum link scan time value during cyclic transmission is stored. (Unit: ms)
Un\G4118 Minimum link scan time (Unit: ms) The minimum link scan time value during cyclic transmission is stored. (Unit: ms)
Un\G4119 Current link scan time (Unit: ms) The current link scan time value during cyclic transmission is stored. (Unit: ms)
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