A communication method and common control bus interconnecting a controller and a precision measurement assembly

A precision measurement and controller technology, applied in the direction of measuring devices, general control systems, program control, etc., can solve problems such as inaccurate deformation, wire and cable traction, and limit servo characteristics, so as to improve measurement performance and reduce cable lines , The effect of reducing service costs

Inactive Publication Date: 2004-12-08
HEXAGON METROLOGY SPA
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  • Description
  • Claims
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Problems solved by technology

[0005] Considering the fact that a large number of conductors creates a significant cable pull problem, since even a very slight twist in the bridge caused by this pull will cause deformations in the mathematical model of the ideal system, the extent of which introduces significant distortions in the measurements imprecision
It is also the case that the controller 28 itself is typically designed according to a very outdated bus architecture (ISA) in the prior art, so it is also necessary to improve the controller itself
Another problem is the limited servo characteristics, which also need to be improved

Method used

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  • A communication method and common control bus interconnecting a controller and a precision measurement assembly
  • A communication method and common control bus interconnecting a controller and a precision measurement assembly
  • A communication method and common control bus interconnecting a controller and a precision measurement assembly

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[0019] now refer to figure 2, shows a precision measurement device 40 having a platform 42 , a first movable part 44 (in this example a bridge 44 ), one or more supports 46 and a detector 48 . Various modules not shown but installed on or inside the precision measuring device 40, such as three motor modules for respectively connecting with one or more actuator motors, one or more motor modules for respectively connecting with one or more encoders Three encoder modules, a detection module for connecting with the detector 48, a limit switch module for connecting with one or more limit switches, and a temperature module for connecting with one or more temperature detectors. The modules may be interconnected as shown using a standard bus such as a known or customary serial network bus such as a CNN (Control Domain Network) bus or by a non-standard bus. CAN is a known serial bus system with multi-master capability according to ISO11898. Utilizing a shared or common bus allows for...

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Abstract

The number and weight of wires interconnecting a host and / or controller with a precision measurement assembly is reduced using a common or shared bus. The bus may be entirely electrical or may include optical fibers to reduce EMI susceptibillty. A custom bus or a known serial network bus such as CAN or SIRCOS may be used.

Description

technical field [0001] The invention relates to a precision measurement tool, in particular to a shared control bus between a host computer and a precision measurement device. Background technique [0002] Precision measurement tools include coordinate measuring machines (CMMs), precision measuring instruments, and more. CMMs range from table-top, hinged-arm manual CMMs to high-speed DCC scanners, gantry, shop floor measurement robots and horizontal arm CMMs complete with metrology software, detectors and auxiliary equipment with supporting networks. [0003] For example, Figure 1 shows a precision measurement device 10 in the form of a vertical CMM according to the prior art. This device comprises a fixed platform 12 and a main or first movable part 14 mounted thereon. In the illustrated case of a vertical CMM, the first movable portion 14 spans the platform 12 in the form of a bridge. In other configurations of such horizontal CMMs, the first moveable portion typically ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/00G01B21/04G08C15/00
CPCG05B2219/33218G05B2219/37193G01B21/04G05B2219/40237
Inventor G·W·拉塞尔
Owner HEXAGON METROLOGY SPA
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