Hi Guys

I’m using USS Protocol for data exchange (read / write parameters) between CPU 224XP & MM420

My problem is the when instruction / USS_RPM_R / is active:

The / USS_RPM_R / request isn’t transmitted to the MicroMaster drive on each scan,
so the value of output of / USS_RPM_R / is showing for one time only but not continuouslywhen / EN= ON & XMT_REQ = ON /

Please advise…

Thank u …

I’m using CPU S7-200 & MM420 & the communication via USS Protocol.

I need to use instruction( USS_RPM_R )in order to read Act. Output frequency (Parameter r0024) from the drive.

So how can I execute that function perfectly….

New question published by Vladich is split to a separate thread with the subject V90 and s7 1200, how to read a parameter from drive.

Best regards
Min_Moderator