The S7-1200 CPU supports 8 connections for open user communications (active or passive) using the following instructions: T_SEND_C, T_RECV_C, TCON, TDISCON, TSEND and TRECV.
Note
Modbus TCP uses Open User Communications (OUC) connections as Modbus communications path. There can be multiple client-server connections in addition to the connection between STEP 7 and the CPU. Mixed client and server connections are supported up to the maximum number permitted to be supported by the CPU for Open User Communications.
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