Use Case

Writing Online Device Parameter

Description

The OPC client allows configuring or updating parameter values on the device. Writing is executed from an OPC client to an OPC server providing the FDT OPC UA information model.

Stakeholder

Preconditions

Use Case B1 (List Topology)

Post conditions

OPC client can retrieve the updated device parameter values

Actors

Field Engineer, Device Expert, Maintenance Engineer

Trigger

Device Commissioning, Device Calibration, Device Configuration

Frequency

Description

Step

Action

2

User starts browse from Device Topology

3

OPC Client displays the topology to the user

4

User browse the parameters on the selected device

5

OPC Client displays available parameters on the device

6

User selects the device parameter that the value needs to be updated or changed

7

User changes the value of the selected device parameter based on its type

8

User commits the changes

9

OPC server puts the lock on the device

10

OPC server validates the specified parameter value

11

OPC server writes the updated value to the device

12

OPC server removes the lock on the device

13

OPC client displays the new value of the selected device parameter

Exceptions

Step 7, Value does not match the data type of the device parameter.

Step 8, Device is in locked state.

Step 10, Value exceeds the minimum and maximum limit specification of the device parameter.

Requirements

User has access permissions to the server

Notes

Open Issues