S7 200 modbus slave library download. The example is set up for a MODBUS communication between the Ports 0 of two S7-200 CPUs (preferably each with 2 communication interfaces). On the master side it would also be possible to select Port 1 with the corresponding library block selection 'MBUS_CTRL_P1' and 'MBUS_MSG_P1'. • The S7-200 CPU must be firmware revision 2.00 or greater to support the Modbus Master Protocol Library (CPU MLFB 21x-2xx23-0XB0). • The Modbus master library utilizes the user interrupts for some functions.

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