In addition to "Modbus_Master" instruction, but also "Modbus_Comm_Load" command to establish communications.Īre two blocks 7 (TIA Portal) in STEP, "Instructions> Communication> Communication processor> MODBUS (RTU)> = Version 3.0". CM 1241 RS232 (order number: 6ES7241-1AH32-0XB0) combined with the communication module firmware upgrade to> = V2.1.CM 1241 RS422 / 485 (order number: 6ES7241-1CH32-0XB0) binding to the communication module firmware upgrade> = V2.1. Modbus RTU communication through the following modules. In addition to the software required STEP 7> = V13 SP1 (TIA Portal), you also need S7-1200 CPU firmware version> = V4 (Article ID: 6ES721x-1xx40-0XB0).
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