Mitsubishi Electric MELSEC iQ-R Series User Manual page 394

Monitor data pointer storage area (Un\G9728/13056 (default))
■The oldest data position of the monitor data area is stored using the offset value from the start
address of the monitor data area.
0 to (monitor buffer size designation (default: 0D00H) - 3): the oldest data position
■When the monitored data exceeds the monitor buffer size, the new data is written over the
oldest data. (Ring buffer type)
The oldest data position of the monitor data area can be confirmed from this area.
Ex.
"Un\G9745" becomes the oldest data when "000FH" is the monitor data pointer using "Un\G9730" as the start address of the
monitor data area.
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9
+A
+B
+C
+D
+E
+F
Monitor data quantity storage area (Un\G9729/13057(default))
The number of monitor data stored in the monitor data area is stored.
0 to (monitor buffer size designation (default: 0D00H) - 2): number of monitor data
20 USING SEND/RECEIVE DATA MONITORING FUNCTION
392
20.2 Send/receive Data Monitoring Function Settings
Monitor data pointer
storage area
Monitor data size
storage area
Oldest data in the
monitor data area