i've been using the modicon momentum i/o products for several years with good success. i use the ethernet communication module in all cases. i use 'C' tasks (sockets) to perform the reading/writing from/to the cards. i need to modify the module timeout register(0x4f001). typically to access a register i've subtracted 0x40001 & used this value as the reference starting register. this doesn't seem to work for this particular case. any suggestions ? i'm sure its a personal problem but i really need a quick fix. thanks much.