Hello,

I have the same problem. CPU messages (Warnings/Alarms) not displayed on WinCC. The CPU messages displayed last message as CPU Alarm Acknowledgment memory  full and SFC_17 & SFC_18 ret_val error code is 8082 (Not enough CPU resources)

I'm using S7-414 redundant CPUs with 2MB RAM and the load memory is more than 80% free\

Thanks

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Split from Wincc alarm logging problem.

If you are seeing error returns from ALARM_S and ALARM_SQ, then the issue is that the messages are not getting send by the PLC, so WinCC does not see them.  ALARM_S and ALARM_SQ use system resources to track the current state of the alarm, so a resource is occupied from rising edge to falling edge on SIG. 

Assuming you are using a 6ES7 414-4HM14-0AB0, https://support.industry.siemens.com/cs/ww/en/pv/6ES7414-4HM14-0AB0/td lists the limits on messages (scroll down to "S7 Message functions").  For ALARM_S / ALARM_SQ, the limit is 100 simultaneous alarms.  However, if you switch to using the ALARM8 blocks (SFB34 / 35), the limits increase to 1200 simultaneous alarms.

SFC107 ALARM_DQ and SFC108 ALARM_D are similar to ALARM_S and ALARM_SQ, except that you can manually manage the system resources to force alarms to free up occupied resources.  More information in https://support.industry.siemens.com/cs/ww/en/view/44240604