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