Patent ID: 9690285
Date: 2017-06-27
CPC Classifications: G05B,G06Q,H04W

Claim:
1. A method of enabling an operator of a process control system to determine the location of field users in the process control system, the method being performed by a field user presenting arrangement and comprising the steps of: obtaining position data of the position of a field user in the form of a maintenance engineer; obtaining the positions of objects in the process control system; comparing the position of the maintenance engineer with the positions of the objects; determining that the maintenance engineer is in the vicinity of an object if the distance between the position of the maintenance engineer and the position of the object is below a proximity threshold; presenting the maintenance engineer on graphics depicting the process, where a maintenance engineer deemed to be in the vicinity of an object is presented at this object in the graphics; receiving an indication that the maintenance engineer is in control of the object, wherein the process control system is in a first state at least in a section of the system in which said object being controlled by the maintenance engineer is provided, said first state being a safety state where the process is shut down completely or partly or running in a safety mode; indicating this control in the presenting of the maintenance engineer on the graphics; comparing, after the indication of control has been received, the distance between the controlled object and the maintenance engineer with a release threshold; determining that the maintenance engineer has released the object based on the threshold being exceeded; presenting the changed status of the object; and instructing the process control system to change system state based on the determination of the release of the object.