Modbus¶

The first step is to establish a Modbus interface between a control system and Arundo Edge.

1. On the sidebar, select Interfaces | Add new.
2. Select Modbus.
3. In Name, enter the name of the control system.
4. In Connection Type, select "TCP".
5. In URL, enter the connection address for the control system.
6. In Port, enter the port used for connections to the control system.
7. Complete the remaining fields as necessary.
8. Click Add interface.

The next step is to add function calls for the interface.

1. Click Add Function Call.
2. In Name, enter "Read".

3. In Function Type, select "Read Holding Registers".

   Tip

   This function call will collect data from the control system.

4. Complete the remaining fields as necessary.

5. Click Add.
6. Click Browse in the Operation column for the function call.
7. In Quantity, select the quantity of bits the tag value spans.
8. Under Select address space (browse), adjust the slider control and use the Raw Hex Output matrix to locate the correct bit address.
9. Under Viable types, select the value to use for the tag.
10. Click Add Tag.
11. Click Add Function Call.
12. In Name, enter "Write".

13. In Function Type, select "Write Holding Registers".

    Tip

    This functional call will send data back to the control system.

14. Click Add.

15. Click Add Tag next to the functional call you just added.
16. In Tag ID, enter the unique identifier to use for the write tag.
17. Complete the remaining fields as necessary.
18. Click Add.

The final step is to build a compute block to calculate the value to write back to the control system.

1. Select Compute Chain on the sidebar.
2. Click Add Compute Block.
3. In Name, enter a name for the compute block.
4. In Update Criteria, select "Any Input Received".
5. (Optional) In Description, enter a description of the output value of the compute block.
6. In Interval, specify the interval in milliseconds at which to update the output value.

7. Under Inputs, complete the following:

   1. In Interface field, select the Modbus interface you just added.
   2. In Tag ID field, select the tag you added for the Read Holding Register.
   3. In Expression variable name field, enter "A".
   4. Click + Add.

8. Under Outputs, complete the following:

   1. In Interface field, select the Modbus interface you just added.
   2. In Tag ID field, select the tag you added for the Write Holding Register.
   3. In Expression variable name field, enter "B".
   4. Click + Add.

9. In Define the expression, enter $B = A + 1$.

10. Click Save.

1. On the sidebar, select Interfaces and select the interface.
2. Click Advanced Parameters.
3. Make changes as necessary.
4. Click Save.

1. On the sidebar, select Interfaces and select the interface.
2. Locate the call in the Function Calls list.
3. Click Edit next to the call.
4. Make changes as necessary.
5. Click Save.

1. On the sidebar, select Interfaces and select the interface.
2. Locate the call in the Function Calls list.
3. Click Delete next to the call.
4. Click OK.

1. On the sidebar, select Interfaces and select the interface.
2. Locate the relevant call in the Function Calls list.
3. Click + to expand the tags list.
4. Click Edit next to the tag.
5. Make changes as necessary.
6. Click Save.

1. On the sidebar, select Interfaces and select the interface.
2. Locate the relevant call in the Function Calls list.
3. Click + to expand the tags list.
4. Click Delete next to the tag.
5. Click OK.

1. On the sidebar, select Interfaces and select the interface.
2. Deselect Enabled.
3. Click Save.

1. On the sidebar, select Interfaces and select the interface.
2. Click Delete.
3. Click Yes.