Dear friends,

I have a S7-1200 CPU (Master) that have to talk with four more S71200 CPUs (Local)using TSEND_C and TRCV_C functions. The master has 4 pairs Send/Receive for each local, each local has his relevant Send/Receive.

For some reason first and second slaves are working OK but it the third and fourth are giving compilation errors –“ambiguous parameter”. The Master is compiled OK.

According to the 1200 Manual each CPU supports up to 8 connections TSEND_C/ TRCV_C .

I’m exceeding this limit with my four slaves? Could I have 4 CPU connected to one master in 1200?

Or the problem is somewhere else?

New question published by David4444 is split to a separate thread with the subject Function to send DataBlocks of about 20 DoubleWords between each Slave to the Master.

Best regards
Min_Moderator