Portable field maintenance tool with a bus for powering and communicating with a field device
Inactive Publication Date: 2018-02-02
FISHER-ROSEMOUNT SYST INC
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Problems solved by technology
Even when designed to supply voltages below 29V, typical portable power supplies do not include fail-safe mechanisms to ensure against supply voltage or current spikes
Method used
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[0048] This disclosure describes a portable field maintenance tool and various techniques for implementing the portable field maintenance tool. Figure 1A An example portable field maintenance tool 100 (“tool 100 ”) is depicted that may be connected to field device 160 via communication link 150 . Advantageously, the tool 100 is capable of not only communicating with the field device 160 but also powering the field device 160 . Tool 100 may utilize a single composite signal transmitted via link 150 for powering and communicating with field device 160 . In some cases, tool 100 may diagnose problems with field device 160 or with a communication link (eg, a HART loop or Fieldbus segment; not shown) to which field device 160 is connected in a factory environment. In some examples, tool 100 may communicate with or diagnose field devices configured according to different protocols. For example, the tool 100 is capable of communicating with, powering, and diagnosing conventional 4-2...
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A portable field maintenance tool comprises a power supply and a communication circuit within a housing. A communication interface has terminals for electrically connecting to a field device and providing a composite signal comprising a power supply and a digital Amplitude Modulated (AM) communication signal. The tool may be intrinsically safe and a shunt may be used to connect a communications terminal to a power supply output to generate the composite signal. A fuse may be included to limit the maximum current at the communications interface. The maximum output voltage and power of the powersupply may also be limited. The power supply may be configured to ramp the power signal as power is initially supplied to limit the peak current on the bus. The power supplied to the terminals may befurther limited based upon measured noise signals on the communications bus, and the output limited should a threshold be exceeded. Protocols for communications may include HART or field bus. Furtheraspects of the invention include a method of communicating with a field device, and a method of controlling bus power provided by a portable field maintenance tool.
Description
technical field [0001] The present disclosure relates generally to portable field maintenance tools, and more particularly, to portable field maintenance tools that can be used in a wide variety of environments and situations. Background technique [0002] Process control systems, such as those used in chemical and petroleum processes, typically include one or more process controllers that communicate via analog, digital, or combined analog / digital communication links ground coupled to at least one host or operator workstation and one or more field devices. [0003] Process controllers (sometimes referred to as "controllers"), typically located within a plant environment, receive signals indicative of process measurements (sometimes referred to as "control inputs") and use the information carried by these signals to implement control routines that control The routines cause the controller to generate control signals (sometimes referred to as "control outputs") based on the ...
Claims
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IPC IPC(8): G05B19/418
CPCG05B19/4185G05B2219/31088H04L12/10H04L12/40045H04L2012/2843H04L2012/4026H04B1/3827H04B3/548G05B19/0425G05B2219/23406G05B19/418G05B19/042H04L12/40
Inventor R·本森A·弗古森M·R·达拉尔S·P·戈里韦尔
Owner FISHER-ROSEMOUNT SYST INC