Panasonic FP2 ET-LAN Technical Manual page 256

[51H] Read data area
The specified number of words of data are read, starting from the specified first word number of the data
area.
Area code
Area type
Link relay (WL)
Internal relay (WR)
External output relay (WY)
External input relay (WX)
Timer/counter set value area (SV)
Timer/counter elapsed value area (EV)
Link data register (LD)
Special internal relay (WR)
Special data register (DT)
Data register (DT)
File register (FL)
14-28
Area code
00
01
02
03
04
05
06
07
08
09
0A