GE AF-650 GP Quick Installation Manual page 21

By first selecting the GE network and secondly selecting the IO Scanning tab, the scanning list appears. You will have to fill out the list as shown here
4
Menu
IO Scanning
This configuration copies the information stored from %MW200 to %M209 in the PLC to the Holding register 50010 to 500019 of the AF-650 GP. It reads the holding
registers 50000 to 50009 of the AF-650 GP to the PLC's memory %MW100 to %M109
20
Menu point
IP address
Unit ID
Health Timeout
Repetitive rate
RD Master Object
RD Slave Index
RD Length
Last Value
VR Master Object
VR Slave Index
VR Lenght
Description
Setting
192.168.001.030
255
1500
60
%MW100
50009
10
Hold Last
%MW200
0
10
-
Modbus TCP