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Pakets of holding register adresses
February 8, 2017
16:09, EET
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Ibrahim
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Hi,
we have the following case: we want to connect the modbusServer to a Modbus Sensor Gateway. The protocol is Modbus RTU over TCP. After several tests and reconfiguring we could not get all data from the sensor nodes. So we contacted the gateway vendor and they decribed us how to configure it. They told us that each sensor node has a block of 256 holding registers, but all under the same unit-ID. I.e.:
SensorNode 1 –> register1 to 255
SensorNode 2 –> register256 to 511
SensorNode3 –> register 512 to 767
….
is it possible to configure blocks of registers in the OPC UA ModbusServer? We only found the possibility to configure several unitIDs.

Regards
Ibrahim

February 13, 2017
16:32, EET
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Heikki Tahvanainen
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Hi Ibrahim,

According to our understanding this setup should work if you setup only one device configuration (the Sensor Gateway) and then configure Holding Registers according to the description above. So, all different Sensor Node registers are configured in the same Holding Registers view.

Could you explain more about the requirements? Is the problem that you would like the OPC UA address space to be structured differently? Or do you mean that you would like to map “blocks of registers” from Modbus communication to array type in the OPC UA side?

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