It is manufacturing SPM. S7-1511 PLC is connected to ET200SP IO station by IM 155-6 PN ST & ET200S IO station by IM 151-3 PN HF. Both stations contain one Serial communication modules.  Port_Config block is used for port configuration. CM 6ES7 137-6AA00-0BA0 on ET200SP station is working fine. Both Sending & receiving blocks are working. CM 6ES7 138-4DF01-0AB0 on ET200S IO station is not working properly. Data receiving with the help of S_RCV block is receiving data but error status shows 16#1EOE.  But when I use S_Send block & give start cmd, PLC goes to STOP. I then downloaded OB121[Programming error OB], now PLC is in run but S_Send block returns with error status 16#1E0D. I also used Send_P2P and Send_PTP blocks, here also PLC goes to STOP just by downloading program. 

I googled a lot for recommended blocks for above  1 SI CM  for  controller  S7-1500, but no manuals tells specifically about this.