Hi Guys,

I am investigating an error of WinCC communication to the PLC and I got this error "Errorcode 0x0000 7001" which has a description

"Connection closed due to Stop check.

• The connection was terminated by the channel because a "STOP", "HOLD" or "DEFECTIVE" VMD status was detected for the CPU."

Hello Dawg;

Have a look at this comment from member April, discussing the WinCC channel diagnosis control:

all available description is included in WinCC Online documentation

See Communication > Communication - Diagnostics > Channel Diagnosis > Diagnosis of channel with channel diagnosis

From: How to use Channel Diagnosis Control?

Hope this helps,

Daniel Chartier

Hi Dchartier,

I am just looking for the meaning of VMD mentioned here that is all.