Hello

I can't clear "Alarm 3000" Emergency stop.

System is Sinumerik Power Line 840D   NCU571.4,    PCU 50

I checked everything all of them looks ok.There is no emergency button pressed no door is opened.

I made a test and signals are like this.

Emg. button pressed ---> DB10.DBX56.1 = true

Emg. button released (Acknowledge button not pressed)---> DB10.DBX56.1 = true

Emg. button released and Acknowledge button pressed ---> DB10.DBX56.1 = false

DB10.DBX56.2 = true (when Ack. button is pressed)

Signals are as I expected but "Alarm 3000" still there.

I also checked if DB10.DBX56.1 becomes true and false in a short time. I wrote a small ladder which will set an memory bit if DB10.DBX56.1=true. No, DB10.DBX56.1 never becomes true.

Now DB10.DBX56.1 = false but "Alarm 3000" still there and DB10.DBX106.1 = true (Emergency stop active)

When I press Reset button on MCP, only time of Alarm 3000 updates but not clear.

I there any other signal which can trigger an "Alarm 3000" Emergency stop alarm?

Which signals should I check?

pandora303

Thank you PISCEAN 2010. This document solved my problem.

Hi Pandora303,

I'm dealing with a very similar issue. Do you recall what it was that stopped your system from resetting & the fix you implemented?

I have reviewed the documentation & I'm working on a fix myself. 

(Thank you PISCEAN2010 for the document)