Hello,

I have a Master PLC S7-1515 collecting data and sending data to 35 PLCs S7-1214C.

I don't know what Functions i need to use, as I want to send DataBlocks of about 20 DoubleWords between each Slave to the Master.

Is it T_SEND / T_RCV or U_SEND / U_RCV ?

Thank you for your advices,

Regards,

David

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Split from communication resources with 1200.

David4444

Hello,

I have a Master PLC S7-1515 collecting data and sending data to 35 PLCs S7-1214C.

I don't know what Functions i need to use, as I want to send DataBlocks of about 20 DoubleWords between each Slave to the Master.

Is it T_SEND / T_RCV or U_SEND / U_RCV ?

Thank you for your advices,

Regards,

David

 Hello David,

You can use GET & PUT functions as they will be more reliable and efficient, as they could send more than 160 bytes (40 Double Words ) of data over S7 connection. 

For more data related to those blocks, you could go through this FAQ
 https://support.industry.siemens.com/cs/document/65975617/how-do-you-program-the-get-and-put-instructions-in-the-user-program-of-the-simatic-s7-1200-cpu-in-order-to-transfer-more-than-160-bytes-of-data-?dti=0&lc=en-WW

Regards;

Ahmed Kadry

hi,

I guess this application sample fits better:

Data Synchronization with S7 Communication between several S7-1200 Substations and one S7-1500/300 Head PLC

hope this helps,