Honeywell International Inc.

Srinivasan Rajagopal

Manish Sharma

Dinesh Kumar Kn

Nagaraja Sundaresh

Sachin Kumar

Ashish Sharma

Sai Krishnan Jagannathan

Amol Kinage

Rajesh Ramesh

Sunil M Ingawale

Rakesh Muraleedharan Nair

Karthik Giritharan

Benoy Joseph

A system, apparatus and method are provided for testing a secondary servo control circuit in a redundant control configuration. A first circuit is configured to receive a control signal and to control an attribute of an actuator based on the control signal using a first control input of the actuator. A second circuit is configured to test operation of an actuator circuit using a test signal. The actuator circuit includes at least part of the second circuit and a second control input of the actuator. The test signal is selected to avoid causing independent motion of the actuator. The actuator could be a dual coil servo valve, and the test signal could be a current (such as a DC current, an AC current, or a pulsed current) having a magnitude less than a bias current of the actuator.

System and method for testing a secondary servo control circuit in a redundant control configuration

A parallel operation keyboard (POK) which enables a user to provide multiple inputs simultaneously in managing a process control plant. A lock is provided to disable such simultaneous inputs. In an embodiment, multiple groups of keys are provided, with each group of keys being operable independently to modify the parameter value of a corresponding control loop. A network management station (NMS) and a server are designed to provide a suitable interface. In one implementation, each group of keys contains four keys respectively specifying increasing the parameter value, decreasing the parameter value, manual mode (in which the present level of the variable is controlled by the increase/decrease keys) and normal mode (in which the set point, i.e., the desired value, for the variable is controlled).

Keyboards having multiple groups of keys in the management of a process control plant

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Bengaluru, India

Srinivasan Rajagopal