Multiple alternative automation input system and method

• US 9,785,135 B2
• Filed: 04/15/2014
• Issued: 10/10/2017
• Est. Priority Date: 11/12/2013
• Status: Active Grant

• Current Assignee: Rockwell Automation Asia Pacific Business Center Pte Ltd (Rockwell Automation, Inc.)
• Original Assignee: Rockwell Automation Asia Pacific Business Center Pte Ltd (Rockwell Automation, Inc.)
• Inventors: Shah, Rajesh Ramesh
• Primary Examiner(s): Lee, Adam
• Application Number:
  US14/253,602
• Publication Number:
  US 20150134119A1
• Time in Patent Office: 1,274 Days
• Field of Search: None
• CPC Class Codes: G05B 19/0423 Input/output
• CPC Class Codes: G05B 2219/37427 Detected with thermocouple

Abstract

Components and devices are provided for controlling and monitoring a machine or process using an automation controller that may be capable of receiving inputs from a digital source, an analog source, or a thermistor source. In one embodiment, an automation controller may include first, second, and third input terminals. The first and second input terminals may receive input signals from analog and digital sensors, and the second and third terminals may receive input signals from a thermistor.

Claims

1. An automation component system comprising:

an automation component comprising;

a processor and a memory;

a first input terminal configured to

receive a first input from an analog sensor when the analog sensor is coupled to the first terminal, and

receive the first input from a digital sensor when the digital sensor is coupled to the first terminal;

a second input terminal configured to

receive a second input from the analog sensor when the analog sensor is coupled to the second terminal,

receive the second input from the digital sensor when the digital sensor is coupled to the second terminal, and

receive the second input from a thermistor when the thermistor is coupled to the second terminal; and

a third input terminal configured to receive a third input from the thermistor, wherein in operation the automation component is coupled to a machine and controls the machine.

2. The automation component system of claim 1, wherein the memory comprises a look up table.

3. The automation component system of claim 2, wherein the automation component converts the signals received from the thermistor coupled to the second and third input terminals to a temperature value by reference to the stored look up table.

4. The automation component system of claim 1, wherein the automation component comprises a resistor coupled across the first and second input terminals.

5. The automation component system of claim 1, wherein the automation component comprises a power supply coupled to the third input terminal and configured to provide power to the thermistor when coupled to the third input terminal.

6. The automation component system of claim 5, wherein the power supply provides 10V regulated power for operation of the thermistor.

7. The automation component system of claim 1, wherein the automation component is configured to convert signals received from the thermistor coupled to the second and third input terminals to a temperature value.

8. The automation component system of claim 7, wherein the temperature value is between −

40 and 155 degrees C.

9. The automation component system of claim 7, wherein the automation component converts the signals received from the thermistor using an approximation equation to calculate an approximation of the temperature value.

10. The automation component system of claim 1, wherein the automation component is configured to be coupled to the analog sensor, the digital sensor or the thermistor through an input/output module.

11. The automation controller component system of claim 1, wherein the inputs are configurable and calibrated through an automation controller software program.

12. The automation component system of claim 11, wherein a gain or an offset for the inputs is established using the automation controller software program.

13. The automation component system of claim 11, wherein the automation controller software program configures the automation component to measure a resistance of a resistor coupled across the first and second input terminals.

14. The automation component system of claim 1 comprising a remote control monitoring system connected to the automation component via a network.

15. The automation component system of claim 1, wherein the automation component is configured to receive input signals from the thermistor and control the machine using the input signals from the thermistor, and wherein the machine is a heating, ventilation, and air conditioning (HVAC) system.

16. The automation component system of claim 1, wherein the thermistor input is calibrated by

creating a short across from the second input terminal to the third input terminal,

determining a resistance of the short, and

subtracting the resistance of the short from a resistance of the thermistor.

17. The automation component system of claim 1, wherein the second input terminal and the third input terminal are configured to receive input from both a positive temperature coefficient thermistor and a negative temperature coefficient thermistor.