How can you set the time of an S7-300 via Industrial Ethernet?

Instructions:Generally you have two options for this. You can do this either with a CP343-1 IT or a different CP (e.g.: CP343-1) and use S7 communication or UDP communication. 

  1. Here you should always use a CP343-1 IT (6GK7343-1GX20-0XE0) as communications processor, because it sets the time of the CPU via the SIMATIC procedure or via the NTP (Network Time Protocol).  
  2. If you don't have a CP343-1 IT (6GK7343-1GX20-0XE0), then proceed as described below:
    You need an S7-400 (time synchronized, e.g. via SICLOCK) which as time master provides the time to S7-300 via relevant block calls, e.g. PUT (S7 communication PUT, see point A) or AG_LSEND/AG_LRECV (UDP communication, see point B).

Configuration with SICLOCK as time master.

Fig. 01

  1. Example for setting the time in an S7-300 with S7 communication
No. Procedure
1 First configure a data block with the structure "DATE_TIME" for reading the CPU basic time in the S7-400.

Fig. 02

2 Read out the basic time of the CPU using SFC1 ("READ_CLK"). Fig. 03 shows the function call with SFC1 "READ_CLK"

Fig. 03

3 Transfer the time into a target area of the S7-300 using the S7 function call "PUT".
A sample program for S7 communication is available in Entry ID: 1819293.
4 Set the time in the S7-300 with the values transferred. Fig. 04 shows the function call SFC0 "SET_CLK".

Fig. 04

  1. Example for setting the time in an S7-300 with UDP communication
No. Procedure
1 Read out the CPU basic time in the S7-300 (as described under A).
2 Configure a connection for the UDP communication. Configuration instructions for UDP connections are available in Entry ID: 19065614.
3 In the S7-300 you program the block AG-LRECV (FC60). For S7-400 the block AG_LSEND (FC50).
A detailed sample program is available in Entry ID: 18513371.
4 Set the time in the S7-300 with the values transferred (as described under A).

The NTP procedure (network time protocol)  is also supported by the CPU's integrated interfaces and the distribution for Send/Receive can be implemented with the integrated interfaces and also with every other Industrial Ethernet CP.

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