Distributed monitoring and control fluid handling system

• US 8,392,028 B2
• Filed: 06/03/2008
• Issued: 03/05/2013
• Est. Priority Date: 06/04/2007
• Status: Active Grant

• Current Assignee: Graco Minnesota Incorporated (Graco Incorporated)
• Original Assignee: Graco Minnesota Incorporated (Graco Incorporated)
• Inventors: Lange, Christopher M., Mrozek, Greg T., Scherer, William C, Sutter, Fred A, Parnes, Gary S.
• Primary Examiner(s): Ali, Mohammad
• Assistant Examiner(s): WHITTINGTON, ANTHONY T
• Application Number:
  US12/600,789
• Publication Number:
  US 20100161138A1
• Time in Patent Office: 1,736 Days
• Field of Search: 700/266, 700/281, 700/282, 700/285, 702/100
• US Class Current: 700/282
• CPC Class Codes: G05B 19/052 Linking several PLC's
• CPC Class Codes: G05B 2219/1204 Multiprocessing, several plc's, distributed logic control

Abstract

A fluid handling control/monitoring system is divided into a network of modular, intelligent components. These individual components are generally specific to a certain function within the system and contain all the intelligence necessary to perform that function without external guidance. Examples of the different types of components include but are not limited to: human-machine interface (HMI), fluid control, heater control, motor control, field-bus communications and the like. While each type of board is specialized in function, it may control several items of the same nature. For instance, a heater control may be able to control several heaters on one system. Similarly, a fluid board may have the ability to receive input from more than one flow meter and then control fluid flow of more than one point. An example might be a plural component metering and dispensing system where two fluid components have to be combined in a precise mix ratio.

Claims

1. A fluid monitoring and control system comprising a network of a plurality of modular components having different functions and a system-wide distributed memory storing distributed variables, wherein each modular component performs the respective function of said modular component without external guidance and wherein at least one first modular component comprises:

means for measuring a variable to be controlled;

means for controlling the variable to be controlled; and

means for broadcasting the value of said controlled variable over the network wherein the fluid monitoring and control system uses a broadcast message to inform all said modular components within the system of the current value of a distributed variable, said broadcast message comprising an address for the distributed variable within the system-wide distributed memory and a value for the distributed variable; and

wherein the fluid monitoring and control system uses a set-point request message to request a change in the value of a distributed variable, said set-point request message comprising an address for the distributed variable within the system-wide distributed memory and a value for the distributed variable.

2. A fluid monitoring and control system according to claim 1, wherein a said modular component controls several items of the same nature.

3. A fluid monitoring and control system according to claim 1, wherein the at least one first modular component is a fluid control module, the system further comprising an interface module as a second modular component and a heater control module as a third modular component, all of the first to third modular components being connected to a bus.

4. A fluid monitoring and control system according to claim 1, further comprising at least one interface module comprising means for displaying at least one said controlled variable.

5. A fluid monitoring and control system according to claim 3, wherein the interface module further comprises means for inputting a set-point for a variable to be controlled.

6. A fluid monitoring and control system according to claim 3, wherein at least one modular component is a stand-alone module comprising means for broadcasting the value of a monitored variable over the network.

7. A fluid monitoring and control system according to claim 6, wherein the stand-alone module is one of a pump controller, a batch controller, a volume verification monitor, a ratio monitor, a tank level monitor and a dispense control monitor.

8. A fluid monitoring and control system according to claim 1, wherein each said component comprises a unique configuration ID.

9. A fluid monitoring and control system according to claim 8, wherein each configuration ID comprises a component ID, a software application ID and a purpose ID.

10. A fluid monitoring and control system according to claim 8, wherein each modular component transmits periodic heartbeat messages consisting of the unique configuration ID of said modular component.

11. A fluid monitoring and control system according to claim 3, wherein the distributed variables comprise at least one of pressure, temperature, flow rate, speed, time and date information.