If you want to use JUMO Modbus devices in CODESYS, the following steps are generally required.
Modbus RTU (serial)
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Download JUMO Modbus Devices from the JUMO website and install
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Open CODESYS project and add Modbus devices
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Use function block "FB_ComPortControl"
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Typical device settings and operations
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Build a separate visualization object with corresponding buttons
Modbus TCP/IP
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Download JUMO Modbus Devices from the JUMO website and install
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Open CODESYS project and add Modbus devices