Signal handling device

• US 6,421,628 B1
• Filed: 07/30/1999
• Issued: 07/16/2002
• Est. Priority Date: 03/08/1999
• Status: Expired due to Fees

• Current Assignee: Leine & Linde AB (Baxter International Inc.), Dr. Johannes Heidenhain GmbH
• Original Assignee: Dr. Johannes Heidenhain GmbH
• Inventors: Fuchs, Peter, Thorsander, Ulf
• Primary Examiner(s): Hilten, John S.
• Assistant Examiner(s): Le, John
• Application Number:
  US09/364,448
• Time in Patent Office: 1,082 Days
• Field of Search: 340/3.1, 340/35, 340/35.1, 340/35.2, 340/35.4, 340/686.1, 340/686.3, 340/825.49, 700/3, 309/9.1, 709/201, 702/188, 702/150
• US Class Current: 702/150
• CPC Class Codes: G05B 19/0423 Input/output
• CPC Class Codes: G05B 19/4141 characterised by a controller or microprocessor per axis

Abstract

A signal handling device enables a data transmission between a plurality of position measuring devices and a master unit. The signal handling device includes a main communications port for communicating with a master unit via a data bus and a measurement port for communicating with a position measuring device. The signal handling device also includes an extension port for connection to an intelligent slave unit so as to enable communication with a plurality of position measuring devices via the said slave unit. In addition, the signal handling device also includes a data processing unit which is capable of managing data traffic between the main communications port, the measurement port and the extension port.

Claims

1. A signal handling device for enabling a data transmission between a plurality of position measuring devices and a master unit, the signal handling device comprising:

a main communications port for communicating with the master unit via a data bus;

a measurement port for communicating with a position measuring device of the plurality of position measuring devices;

an extension port for connecting to an intelligent slave unit to enable a communication with further position measuring devices of the plurality of position measuring devices via the slave unit; and

a data processing unit capable of managing data traffic between the main communications port, the measurement port and the extension port, wherein

a plurality of actuators are coupled to the master unit and the master unit provides control signals to the actuators in dependence on measurement signals of the position measuring devices provided to the master unit by the signal handling device.

2. The signal handling device according to claim 1, wherein the data processing unit is connected to the position measuring device, the data processing unit requesting a first position value from the position measuring device and transmitting a command to the extension port, the command causing the slave unit to request at least one second position value from one of the further position measuring devices.

3. The signal handling device according to claim 2, wherein the first position value and the at least one second position value are collected from the position measuring device and the further position measuring devices within a time period from a transmission of the command, the time period ranging between 0 and 100 microseconds.

4. The signal handling device according to claim 2, wherein the data processing unit includes a processor and an input arrangement, the processor performing one of mathematical operations and logical operations on the first position value to determine a first pre-processed position value, the first position value being received by the measurement port, the input arrangement receiving a second pre-processed position value from the extension port, the second pre-processed position value being determined as a function of the at least one second position value, the first and second pre-processed position values being arranged and received by the main communications port to be deliverable in a single message via the data bus.

5. The signal handling device according to claim 1, wherein the extension port includes a pre-assembled connector for enabling a releasable plug-in connection of the slave unit.

6. An intelligent slave unit for enabling a data transmission between a plurality of position measuring devices and a signal handling device, comprising:

a slave communications port for coupling to an extension port of the signal handling device;

a measurement port for communicating with a position measuring device of the plurality of position measuring devices;

an extension port for connecting a further intelligent slave unit, the extension port enabling a communication with further position measuring devices of the plurality of position measuring devices via the further intelligent slave unit; and

a slave data processing unit capable of managing data traffic between the slave communications port, the measurement port and the extension port.

7. The intelligent slave unit according to claim 6, wherein the slave data processing unit transmits a position value request to the measurement port in response to a measurement command from a main module of the signal handling device, the measurement command being received by the slave communications port.

8. The intelligent slave unit according to claim 6, wherein the slave data processing unit includes at least one processor performing one of mathematical operations and logical operations on a position value to determine a pre-processed position value, the position value being received by the slave measurement port, the at least one processor transmitting the pre-processed position value over the slave communications port in response to a transmission request from a main module of the signal handling device.

9. The intelligent slave unit according to claim 6, wherein the extension port includes a pre-assembled connector for enabling a releasable plug-in connection of the further slave unit.

10. A position monitoring system, comprising:

a plurality of position measuring devices determining a position of movable actuators to form position information;

a master unit for receiving the position information;

a signal handling device including a main communications port communicating with the master unit, a measurement port communicating with the plurality of position measuring devices, an extension port and a data processing unit managing data traffic between the main communications port, the measurement port and the extension port; and

a slave unit connected to the extension port;

wherein

the slave unit includes a slave communications port, a slave measurement port, a slave extension port and a slave data processing unit, the slave data processing unit managing a slave data traffic between the slave communications port, the slave measurement port and the slave extension port.

11. A method for enabling a data transmission between a plurality of position measuring devices and a master unit using a signal handling device, the method comprising the steps of:

communicating with the master unit via a data bus coupled to a communications port of the signal handling device;

communicating with a first one of the plurality of position measuring devices via a measurement port of the signal handling device;

providing from the master unit control signals to a plurality actuators in dependence on measurement signals of said position measuring devices;

enabling a communication with further ones of the plurality of position measuring devices via an extension port of the signal handling device; and

managing data traffic between the communications port, the measurement port and the extension port to communicate a plurality of position values via the data bus in a single message.

12. The method according to claim 11, wherein the managing step includes the following substeps:

performing one of mathematical operations and logical operations on one of the plurality of position values received by the measurement port to determine a first pre-processed position value,

receiving a second pre-processed position value in a predetermined manner,

arranging the first and second pre-processed position values in a further predetermined manner, and

providing the first and second pre-processed position values to the communications port to communicate the first and second pre-processed position values to the master unit in the single message.