hello all
i am new to ladder programming, i am using S7 300 PLC, i am unable to figure out how to send data to the plc (control commands) through rs232 cable i'll be glad if somebody can help me with this.
details: basically i have a program that should contol a process after receiving qeuries submmited by user from PC. i need to know how to send these queries (numbers or strings) to the plc and how the plc can read them. my plc is s7 300 from siemens it has one serial port only used for downloading the program
i am new to ladder programming, i am using S7 300 PLC, i am unable to figure out how to send data to the plc (control commands) through rs232 cable i'll be glad if somebody can help me with this.
details: basically i have a program that should contol a process after receiving qeuries submmited by user from PC. i need to know how to send these queries (numbers or strings) to the plc and how the plc can read them. my plc is s7 300 from siemens it has one serial port only used for downloading the program
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