Transmission errror, OP17

Hi!

I control 2 motors via OP17 connected with S7 400, all is ok but when I run the second motor OP17 diplay message :

$044 TRANSMISSION ERROR No 8

and OP17 RESATRT.

I've check all thing I know: cables, power supply, port DP/MPI,address ...But I can not figure out the problem!

Can anybody help me?!!
Any infomation will be appreciated!


Duy

How about joining the forum?

Could it be noise? Sounds like it may be.