Entry type: FAQ, Entry ID: 58497001, Entry date: 04/27/2015

What are the differences between the licensed version and the downloadable demo version of the blocks for Modbus TCP?

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The following entries provide a demo version of the S7 OpenModbusTCP software for connecting a SIMATIC controller to systems of different manufacturers.

The downloadable demo version has no function or time restrictions. Modbus communication can also run without a valid license.

If the Modbus blocks are not licensed, the INTF LED or SF LED of the CPU flashes. In addition, messages are entered cyclically in the diagnostics buffer of the CPU and the status value A090 (hex) is output on the Modbus block in the user program.