Assuming you are using ModbusTCP if you use the Modnet30 driver in Citect then the addresses in Citect are in the form %MW120 and %M20
If you use the standard Modnet driver then you will need to convert the addresses
fow mw addresses - add 40001 to the mw number (mw120 = 40121)
for m addresses - add 1 to the m number and prefix with 0 (m20 = 021)