Creating the boot program, Modbus communication – BECKHOFF BC7300 User Manual

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Appendix

BC7300

Blink block (PRG-CRC)

Creating the BOOT Program

The next step is the creation of a boot project. To achieve this, select,
when you are logged in, Online/Create boot project. The PLC LED flashes
while the boot project is being created. Now set the MODBUS slave
address and switch the Bus Terminal Controller off and then on again.
Remove the programming cable, and connect the MODBUS cable.

MODBUS Communication

Function 4 is used in order to obtain the states of the counters in the two
16-bit output words in the MODBUS master.