Hello everyone,

I'm working with a v18 Unified panel (MTP1200 Unified Comfort) and encountering an issue with time synchronization. I've successfully set up the PLC as an SNTP server, but the HMI time displayed on the alarm control is consistently one hour ahead. Despite setting the alarm control object's time zone to -1, as per the HMI instructions for local time, it fails to automatically adjust for Daylight Saving Time (DLS).

In the PLC program, Daylight Saving Time configuration and time zone adjustments have been made using the SET_TIMEZONE function. However, this doesn't seem to affect the system time, which the SNTP function block uses.

I've searched the forum for solutions and found posts outlining steps I've already tried. My current setup uses the SNTP Server function block to read the system time as follows:

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// Read System Time // line 152

#tempRet := RD_SYS_T(OUT => #tempSysTime);

Attempting to adjust for local time results in an error on the HMI alarm control. The outputs of both RD_SYS_T and RD_LOC_T are DT datatypes:

// Read Local Time // line 152

#tempRet := RD_LOC_T(OUT => #tempSysTime);

This change leads to incorrect time setting errors on the HMI alarm control window.

I can make a solution using PLC logic to provide the correct timezone number to the alarm control object, but this approach seems unnecessarily complex. I would like a solution that applies globally instead of creating a solution for a single object.

Is there a way to adjust this time on the HMI??