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When working with MODBUS over GPRS you will need to use "serial" MODBUS FB. After connection established between the PLCs activate the MODBUS CONFIG.

Attached are examples for V130 Modbus over GPRS. (You can upgrade the applications to V1040 from project menu convert to color).

The Modbus client GPRS application will perform the call to the Modbus server GPRS. (If you don’t have static IP then power up first the SERVER application check on the HMI what is the IP, then change in the client application the IP in GPRS CALL FB)

130 ModBus Client over GPRS.VLP

130 ModBus Server over GPRS.VLP

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