Profibus not communicating with micro master 4

Hi expert

I have problems that mm4 not  connected to PLC.

I just change profibus switch to on because other cables giving to et200.

So I have removed et200 disconnected that profibis node and switch off to on done termination at PLC do port.

Kindly confirm i have right or anything else remaining.

According to it hw configuration also changed.

But PLC not reading and writing telegram io of mm4 or profibus 

Regards

Raman

Raman S

Hi expert

I have problems that mm4 not  connected to PLC.

I just change profibus switch to on because other cables giving to et200.

So I have removed et200 disconnected that profibis node and switch off to on done termination at PLC do port.

Kindly confirm i have right or anything else remaining.

According to it hw configuration also changed.

But PLC not reading and writing telegram io of mm4 or profibus 

Regards

Raman

 Hello,

and the led on the Profibus board of the MM4 how is it?

https://support.industry.siemens.com/cs/ww/en/view/15206510

Thank for your response

The led of profibus control board on mm4 is orange blinking .5Hz

Raman S

Thank for your response

The led of profibus control board on mm4 is orange blinking .5Hz

 Hello,

Hello,

if you have only CPU and MM4 the terminator resistor must be ON on the CPU and on the MM4