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Usage.md

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Usage

We can use the Flow Creator to write and read the Modbus TCP data.

The used flow can be downloaded here and imported into the Flow Creator, that is running on the same IED as the Modbus TCP Connector.

Read metadata

To print out the Modbus TCP Connector metadata, follow these steps:

  • create a mqtt in node
  • set the server to 'ie-databus' with port 1883 and corresponding user name/password ('edge'/'edge')
  • set the topic to ie/m/j/simatic/v1/mbtcp1/dp
  • create a debug node and connect to the mqtt in node
  • deploy the flow and watch the debug window

metadata_flow

metadata

Write data

To write some data on the Modbus TCP tags, you must fetch the tag ID from metadata payload based on the tag name. Please follow these steps:

  • for the var_int tag, create an inject node to write the value -32768 with this JSON payload: {"vals":[{"id":"1","val":"-32768"}]}
  • for the var_int tag, create another inject node to write the value 32767 with this JSON payload: {"vals":[{"id":"1","val":"32767"}]}
  • for the var_dint tag, create an inject node to write the value -2147483648 with this JSON payload: {"vals":[{"id":"3","val":"-2147483648"}]}
  • for the var_dint tag, create another inject node to write the value 2147483647 with this JSON payload: {"vals":[{"id":"3","val":"2147483647"}]}
  • create a mqtt out node
  • set the server to 'ie-databus' with port 1883 and corresponding user name/password ('edge'/'edge')
  • set the topic to ie/d/j/simatic/v1/mbtcp1/dp/w/ModbusServer
  • connect the inject nodes to the mqtt out node
  • deploy the flow
  • click the single inject buttons, to write the values

write_data_flow

Read data

To print out the transfered Modbus TCP Connector data, you must fetch the tag ID from metadata payload based on the tag name. Please follow these steps:

  • create a mqtt in node
  • set the server to 'ie-databus' with port 1883 and corresponding user name/password ('edge'/'edge')
  • set the topic to ie/d/j/simatic/v1/mbtcp1/dp/r/#
  • create a debug node and connecto to the mqtt in node
  • deploy the flow
  • as soon as the value for a configured tag changes, you can see it in the debug window

read_data_flow

If some data is written in Flow Creator it looks like the following:

read_1

Use IIH Essentials

The app IIH Essentials collects the data out of different connectors and stores it for a defined time period. This is a prerequisite for other apps like Performance Insight.

To activate the data transfer from the Modbus TCP Connector, proceed as following:

  • open the IED web interface
  • open the app IIH Essentials
  • go to tab 'Connectors' and select 'Modbus TCP Connector'
  • select the edit button and enter the user name and the password for the Databus user ('edge'/'edge')
  • activate the adapter and save

DataServiceAdapter

  • go to tab 'Assets & Connectivity' and add the variables that were configured within the Modbus TCP Connector

IIHEssentials_Tags