Modular system and method for an automatic analyzer

• US 5,428,470 A
• Filed: 07/17/1992
• Issued: 06/27/1995
• Est. Priority Date: 07/17/1992
• Status: Expired due to Term

• Current Assignee: Beckman Instruments, Inc. (Danaher Corporation)
• Original Assignee: Beckman Instruments, Inc. (Danaher Corporation)
• Inventors: Labriola, Donald P. II
• Primary Examiner(s): Williams, Hezron E.
• Assistant Examiner(s): MOLLER, RICHARD ALAN
• Application Number:
  US07/916,306
• Time in Patent Office: 1,075 Days
• Field of Search: 359/119, 359/173, 340/870.02, 340/650, 340/870.39, 340/870.19, 340/825.06, 340/318, 340/685, 385/15, 307/149, 307/150, 307/154, 422/62, 422/67, 356/246, 436/50, 436/55, 364/497, 364/496
• US Class Current: 398/109
• CPC Class Codes: G01N 2035/00326 Analysers with modular structure
• CPC Class Codes: G01N 2035/00455 Controlling humidity in analyser
• CPC Class Codes: G01N 2035/00683 of detectors
• CPC Class Codes: G01N 2035/00752 bar codes
• CPC Class Codes: G01N 2035/0475 electric, e.g. stepper motor, solenoid
• CPC Class Codes: G01N 35/00584 Control arrangements for automatic analysers
• CPC Class Codes: G01N 35/00732 Identification of carriers, materials or components in automatic analysers
• CPC Class Codes: G01N 35/00871 Communications between instruments or with remote terminals
• CPC Class Codes: G05B 19/0421 Multiprocessor system
• CPC Class Codes: G05B 19/416 characterised by control of velocity, acceleration or deceleration G05B19/19 takes precedence
• CPC Class Codes: G05B 2219/25197 Optical, glass fiber
• CPC Class Codes: G05B 2219/25232 DCS, distributed control system, decentralised control unit
• CPC Class Codes: G05B 2219/25314 Modular structure, modules
• CPC Class Codes: G05B 2219/33189 Optical, glass fiber
• CPC Class Codes: G05B 2219/33273 DCS distributed, decentralised controlsystem, multiprocessor
• CPC Class Codes: G05B 2219/34047 Dsp digital signal processor
• CPC Class Codes: G05B 2219/34205 Modular construction, plug-in module, lsi module
• CPC Class Codes: G05B 2219/37175 Normal encoder, disk for pulses, incremental
• CPC Class Codes: G05B 2219/41127 Compensation for temperature variations of servo
• CPC Class Codes: G05B 2219/41326 Step motor
• CPC Class Codes: G05B 2219/42034 : Pi regulator
• CPC Class Codes: G05B 2219/42237 : Pwm pulse width modulation, pulse to position modulation ppm
• CPC Class Codes: G05B 2219/43162 : Motion control, movement speed combined with position
• CPC Class Codes: Y10T 436/115831 : Condition or time responsive
• CPC Class Codes: Y10T 436/12 : Condition responsive control

Abstract

An automated analytical system module design essentially electrically isolates modular elements within the analyzer system with inter-module communications provided via packet-based communications. The modules may include a motor controller which estimates motor temperature to enable high initial torque with motor failure prediction and detection. The modules in such a system can be identified on serial communications loops by a module reset and count-off process.

Claims

1. A modular system for use in automazed analyzers, including:

a plurality of functionally distinct modules, each such module including serial communications means for receiving and transmitting serial communications and power supply means for receiving power and producing power for use in the module;

bulk power supply means for supplying bulk power to the power supply means in each module;

a serial communications loop connecting the serial communications means in the modules, the serial communications means including optical serial communication means and the serial communications loop being an optical serial communications loop for enhancing the electrical isolation between modules, and each module including communication processing means, and function specific means for handling a chemical reagent or sample for chemical analysis, and wherein the function specific means for at least one of the modules includes a motor and means for driving the motor.

2. A system as in claim 1 wherein the communications and data processing means includes an electronically alterable memory for storing a module serial number.

3. A system as claimed in claim 1 wherein the function specific means for at least one of the modules includes data acquisition means, and wherein the module including the motor is independent of the module including the data acquisition means.

4. A system as claimed in claim 1 including means for controlling the motor, the means for controlling the motor including means for limiting current applied to the motor to the maximum current, the controlling means including an integrator term integrating loop, and wherein the current limiting means includes means for reducing the integrated term loop value according to a condition that the sum of the integrator with the non-integrated term reaches a selected limit level so as to ensure that the path from the integrator to the output remains in a linear mode of operation.

5. A modular system for use in automated analyzers, including:

a plurality of functionally distinct modules, each such module including a first portion including means for communication processing and control processing and optical serial communications means for receiving and transmitting optical serial communications, and a second portion including power supply means for receiving power and producing power for use in the module and function specific means for handling a chemical reagent or sample for chemical analysis;

bulk power supply means for supplying bulk power to the power supply means in each module;

a serial optical communications loop connecting the serial communications means in the modules, the optical communications loop enhancing electrical isolation between modules; and

the function specific means for at least one of the modules including a motor and means for driving the motor.

6. A system as claimed in claim 5 wherein the function specific means for at least one of the modules includes data acquisition means, and wherein the module including the motor is independent of the module including the data acquisition means.

7. A system as claimed in claim 5 including means for controlling the motor, the means for controlling the motor including means for limiting current applied to the motor to the maximum current, the controlling means including an integrator term integrating loop, and wherein the current limiting means includes means for reducing the integrated term loop value according to a condition that the sum of the integrator with the non-integrated term reaches a selected limit level so as to ensure that the path from the integrator to the output remains in a linear mode of operation.

8. An analyzer comprising multiple modules, and at least one of the modules including a motor and motor control means and some others of the modules including data acquisition means without a motor or motor control means, and wherein each of the respective modules are independent, each module being for use in the analyzer and each module including:

a first submodule portion including processing mens for communication and control processing and optical serial communications means for receiving and transmitting optical serial communications, the optical communications loop enhancing electrical isolation between modules;

a second submodule portion including power supply means for receiving power and producing power for use in the module and function specific means for handling a chemical reagent or sample for chemical analysis; and

processor means for operating in the respective module.

9. A system as claimed in claim 8 including means for controlling the motor, the means for controlling the motor including means for limiting current applied to the motor to the maximum current, the controlling means including an integrator term integrating loop, and wherein the current limiting means includes means for reducing the integrated term loop value according to a condition that the sum of the integrator with the non-integrated term reaches a selected limit level so as to ensure that the path from the integrator to the output remains in a linear mode of operation.

10. A modular system for use in automated analyzers, including:

a plurality of functionally distinct modules, each such module including serial communications means for receiving and transmitting serial communications and power supply means for receiving power and producing power for use in the module;

bulk power supply means for supplying bulk power to the power supply means in each module;

a serial communications loop connecting the serial communications means in the modules, the serial communications means including optical serial communication means and the serial communications loop being an optical serial communications loop, the optical communications loop enhancing electrical isolation between modules, and each module including communication processing means, and function specific means for handling a chemical reagent or sample for chemical analysis, and wherein the function specific means for at least one of the modules includes a motor and means for driving the motor,

the motor being a stepper motor and including motor control means for controlling the position of the stepper motor, the motor including a shaft, and the motor control means including;

encoder means for determining the rotational position of the motor shaft;

means for receiving a shaft target position;

means for determining the different between the target position and the present position of the motor shaft;

means for determining a motor current according to the different between the present position and the target position; and

means for limiting the determined current to a maximum current, means for controlling the current applied to the motor according to the limited determined current, and wherein the current limiting means applies a current amount in excess of a maximum current value to an integrated term integrating loop in the control means, and including means for reducing an integrated term loop value and thereby stabilizing the control means.

11. A modular system for use in automated analyzers, including:

a plurality of functionally distinct modules, each such module including serial communications means for receiving and transmitting serial communications and power supply means for converting power and producing power for use in the module;

bulk power supply means for supplying bulk power to the power supply means in each module;

a serial communications loop connecting the serial communications means in the modules, the serial communications means including optical serial communication means and the serial communications loop being an optical serial communications loop, the optical communications loop enhancing electrical isolation between modules, and each module including communication processing means, and function specific means for handling a chemical reagent or sample for chemical analysis, and wherein the function specific means for at least one of the modules includes a motor and means for controlling the motor, and the controlling means including means for limiting the motor current, the limiting means including an integrating control loop and the controlling means further including means for limiting the integrating control loop output according to a condition that the sum of the integrator with the non-integrated term reaches a selected limit level so as to ensure that the path from the integrator to the output remains in a linear mode of operation.