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CMD lets you use the command line, for example to run some script. Path to working directory can be specified, which gives you the option to use relative paths in the command line.
Context, from the application , can be sent to the standard input, so it can be used for further processing.
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Another option is to establish connection specifically for Siemens S7 PLC. You can also write a specific message you want to send and have the option to choose between
In the message field, you can choose where the value should be set - you can choose between areas I, Q, M and specific byte and bit. Logical 0 or Logical 1 values can be written to that particular bit.
Example of setting area M, byte 1, bit 3:
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Then specify the destination IP address and port to which the message is supposed to be sent.
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You can find more details on the PLC page.