Automatic handling of lamp load on do channel
AssigneeHoneywell International Inc.
InventorsRam Mohan Anugu, Nagaraja Sundaresh, Vivek Vijayakumar, Shripad Kumar Pande
Life of this patent
Estimating the term…
Abstract
A digital output module, method, and non-transitory computer readable medium provide for automatic handling of a lamp load on a digital output channel. The digital output module includes a digital output control switch and a processor operably connected to the digital output control switch. The digital output control switch opens and closes a circuit to a lamp load. The processor receives a readback of a current value applied to the lamp load attached to the digital output module, and controls the digital output control switch based on the readback current value.
Claims14
An industrial control system, comprising:
- a digital output channel of a programmable logic controller further configured as a lamp load operable as a status indicator light within the industrial control system;
- a digital output control switch configured to open and close a circuit to the lamp load;
- one or more processors operably connected to the digital output control switch and the digital output channel, the one or more processors configured to:
- receive a readback of a current value applied to the lamp load attached to the digital output channel;
- control the digital output control switch to pulse a current to the lamp load based on the readback current value, wherein the current pulse is limited to not cause an overload on the programmable logic controller and the current pulse further heats the lamp to increase the resistance of the lamp load;
- determine when the readback current value is equal to a rated current value of the lamp load;
- and
- control the digital output control switch to maintain the current to the lamp load when the readback current value is equal to the rated current value, wherein the current pulses stop when the current is maintained.
5-7. (canceled)
A method for an industrial control system, comprising:
- configuring a digital output channel of a programmable logic controller to include a lamp load configured as a status indicator light within the industrial control system;
- receiving, at a processor, a readback of a current value applied to the lamp load attached to the digital output channel;
- and
- controlling a digital output control switch to pulse a current to the lamp load based on the readback current value, wherein the digital output control switch opens and closes a circuit to the lamp load, wherein the current pulse is limited to not cause an overload on the programmable logic controller and the current pulse heats the lamp to increase the resistance of the lamp load
- determining when the readback current value is equal to a rated current value of the lamp load;
- and
- controlling the digital output control switch to maintain the current to the lamp load when the readback current value is equal to the rated current value, wherein the current pulses stop when the current is maintained.
12-14. (canceled)
A non-transitory machine-readable medium encoded with executable instructions that, when executed, cause one or more processors to:
- configure a digital output channel of a programmable logic control to include a lamp load configured as a status indicator light within an industrial control system;
- receive a readback of a current value applied to the lamp load attached to a digital output channel;
- and
- control a digital output control switch to pulse a current to the lamp load based on the readback current value, wherein the digital output control switch opens and closes a circuit to the lamp load, wherein the current pulse is limited to not cause an overload on the programmable logic controller and the current pulse heats the lamp to increase the resistance of the lamp load,
- determine when the readback current value is equal to a rated current value of the lamp load;
- and
- control the digital output control switch to maintain the current to the lamp load when the readback current value is equal to the rated current value, wherein the current pulses stop when the current is maintained.
18-20. (canceled)
Dependencies are inferred from the claim text.