use DCF77 from the library and any commercially available DCF77 receiver.
the output of the receiver goes to the Input REC of DCF77 but be careful some receivers have a low acitve output, in this case you need to change polarity of the input REC.
You also need the have the correct input module for your PLC matching the output voltage of your receiver.
all other inputs of DCF77 can remain unconnected and it should give you time and date after approximately 2-3 minutes of received data.