Writing of the date/time in the PLC

Good morning,

a customer asked me to make based management synchronizing the date and time of a PLC using the date/time of the PC.

To do this, I managed a PC as NTP server and have configured CPU319F-2PN in order to receive information from the computer. And so far everything is OK !!

The problem arises in the summer/winter time change, because the PLC receives the UTC time of my time zone and not the exact time displayed on Windows. To correct this problem, I used the management through the FC61 function. As a result I get the exact current time. And so far everything is OK !!

The problem now lies in the fact that the correct date/time, I can see it only within the project output of FC61 function and I can not download it to the CPU via SFC0 (SET_CLK). Or rather, in an attempt to override the date/time I have several problems.

Ex .:

- if I enable SFC0 continuously, the PLC will visualize an increase of the date and time infinity;

- if I enable SFC0 by a clock, the PLC will visualize the correct date and time until refresh by the NTP protocol that will take me back to the PLC date/time in the UTC time zone of the PC (with -1 hour in my case).

Unfortunately I am not able to query the NTP update interval pulse, I wanted to use as an impulse to enable SFC0, although not think it works as a solution.

In summary:

- reception of the date / time from PC to PLC via NTP is OK

- the development of the date / time via FC61 is OK

- writing the result FC61 in PLC through SFC0 NOT OK

Can you, kindly, help me with the writing of the date/time in the PLC ??

Or, do you know a solution to correctly synchronize, via Ethernet, the time and date between a PC (master) and a CPU (slave) or CP ??

Thank you in advance !!

P.S. Should I help in attachment I sent you a little test project (nell'FC100 there is the date / time processing). I use SIMATIC Step7 v5.5 + SP3

Hello Fury13

-> I´m Sorry I am not a PLC Expert. My Topics are HMI, IPCs and Communication.

But perhaps this FAQ helps:

https://support.industry.siemens.com/cs/ww/en/view/17990844

Bye Murof

hello dchartier,

the PC and the CPU are connected directly via Ethernet.

I've been following several guides on the forum and I also contacted the siemens support, but I have solved my problem. It's best described here:

https://support.industry.siemens.com/tf/ww/en/posts/writing-of-the-date-time-in-the-plc/164481/?page=0&pageSize=10#post670360

since I was not a solution, I wanted to know if I can read the computer's local time on siemens blocks.