Method and device for performing a bus request and collective acknowledgement in a process bus system

• US 4,628,503 A
• Filed: 02/09/1984
• Issued: 12/09/1986
• Est. Priority Date: 02/09/1983
• Status: Expired due to Term

• Current Assignee: Brown Boveri & CIE AG (ABB Limited)
• Original Assignee: Brown Boveri & CIE AG (ABB Limited)
• Inventors: Siebert, Hartmut, Grams, Timm, Figge, Johannes, Deck, Werner
• Primary Examiner(s): Olms, Douglas W.
• Application Number:
  US06/578,670
• Time in Patent Office: 1,034 Days
• Field of Search: 370/85, 370/94, 370/110.4, 340/825.5, 340/825.38, 340/825.54
• US Class Current: 370/462
• CPC Class Codes: G06F 13/374 using a self-select method with individual priority code comparator
• CPC Class Codes: G06F 13/376 using a contention resolving method, e.g. collision detection, collision avoidance
• CPC Class Codes: H04L 12/40 Bus networks
• CPC Class Codes: H04L 12/40013 Details regarding a bus controller
• CPC Class Codes: H04L 12/403 with centralised control, e.g. polling

Abstract

A method for performing a bus request or collective acknowledgement on a bus system, in a process bus system for serial data transmission, including subscribers of the process bus system, and a bus control device, includes generating a band-limited signal capable of superposition at all of the subscribers, in accordance with a common given principle, transmitting the band-limited signal with the subscribers for performing a bus request or collective acknowledgement, and analyzing the signal with the bus control device, and a device for carrying out the method.

Claims

1. Method for performing a bus request or collective acknowledgement on a bus system, in a process bus system for serial data transmission, including subscribers of the process bus system, and a bus control device, which comprises generating a band-limited signal capable of superimposition at all of the subscribers in accordance with a common given principle, transmitting the band limited signal by the subscribers for performing a bus request or collective acknowledgement, and analyzing the signal with the bus control device, the method which further comprises forming the signal which is capable of superimposition in the form of an identical digital pseudo noise signal at all of the subscribers, by:

phase modulating a pulse sequence of square-wave oscillations by means of a digital signal formed of a pseuodostochastic binary sequence;

selecting a number of pulses per period of the binary sequence which is substantially twice as high as the maximum number of subscribers connectible to the process bus system;

selecting the frequency of the square-wave oscillations in such a manner that the maximum of the power density spectrum of the pulse sequence substantially corresponds to the band center frequency f_M of a predetermined frequency band having a band width B; and

selecting a number k of the square-wave oscillations per pulse of the binary sequence in such a manner that 1/k substantially correspond to a relative band width B/f_M.

2. Method for performing a bus request or collective acknowledgement on a bus system, in a process bus system for serial data transmission, including subscribers of the process bus system, and a bus control device, which comprises generating a band-limited signal capable of superimposition at all of the subscribers in accordance with a common given principle, transmitting the band-limited signal by the subscribers for performing a bus request or collective acknowledgement, and analyzing the signal with the bus control device;

further comprising a diode and filters which comprises forming the signal which is capable of superimposition in the form of a noise signal generated by the diode operated inthe blocking direction and limited by the filters.

3. Method for performing a bus request or collective acknowledgement on a bus system, in a process bus system for serial data transmission, including subscribers of the process bus system, and a bus control device, which comprises generating a band-limited signal capable of superimposition at all of the subscribers in accordance with a common given principle, transmitting the band-limited limited signal by the subscribers for performing a bus request or collective acknowledgement, and analyzing the signal with the bus control device;

further comprising a common line;

which comprises transmitting data and the signals for a bus request or collective acknowledgement on the common line in separate frequency bands.

4. Method for performing a bus request or collective acknowledgement on a bus system, in a process bus system for serial data transmission, including subscribers of the process bus system, and a bus control device, which comprises generating a band-limited signal capable of superimposition at all of the subscribers in accordance with a common given principle, transmitting the band-limited signal by the subscribers for performing a bus request or collective acknowledgement, and analyzing the signal with the bus control device, the method which further comprises forming the signal which is capable of superimposition in the form of an identical digital pseudo noise signal at all of the subscribers, by phase modulating a pulse sequence of square-wave oscillations by means of a digital signal formed of a pseuostochastic binary sequence;

selecting a number of pulses per period of the binary sequence which is substantially twice as high as the maximum number of subscribers connectible to the process bus system;

selecting the frequency of the square-wave oscillations in such a manner than the maximum of the power density spectrum of the pulse sequence substantially corresponds to the band center frequency f_M of a predetermined frequency band having a band width B;

selecting a number k of the square-wave oscillations per pulse of the binary sequence in such a manner that 1/k substantially corresponds to a relative band width B/f_M ;

including a common line and transmitting data and the signals for the bus request or collective acknowledgement on the common line in separate frequency bands.

5. Method for performing a bus request or collective acknowledgement on a bus system, in a process bus system for serial data transmission, including subscribers of the process bus system, and a bus control device, which comprises generating a band-limited signal capable of superimposition at all of the subscribers in accordance with a common given principle, transmitting the band-limited signal by the subscribers for performing a bus request or collective acknowledgement, and analyzing the signal with the bus control device, including a diode and filters;

forming the signal which is capable of superimposition in the form of a noise signal generated by the diode operated in the blocking direction and limited by the filters;

including a common line;

transmitting data and the signals for a bus request or collective acknowledgement on the common line in separate frequency bands.

6. Device for performing a bus request or collective acknowledgement on a bus system in a process bus system for serial data transmission, comprising a subscribers of the process bus system for transmitting a band-limited digital pseudo noise signal capable of superposition for performing a bus request or collective acknowledgement, a bus control device for analyzing the signal, and a noise transmitter for generating the digital pseudo noise signal at said subscribers, said noise transmitter including a square-wave oscillator having an output, a frequency divider having an input connected to said output of said square-wave oscillator and an output, a pseudo noise sequence generator containing a feedback shift register and having an input connected to said output of said frequency divider and an output, an exclusive OR gate having one input connected to said output of said square-wave generator, another input connected to said output of said pseudo noise sequence generator and an output, and a signal amplifier having an input connected to said output of said exclusive OR gate and an output delivering said digital pseudo noise signal

7. Device according to claim 7, wherein said digital pseudo noise signal produced by said noise transmitter is a pulse sequence formed of square-wave oscillations produced by said square-wave oscillator and phase modulated by a digital signal formed of a pseudostochastic binary sequence generated by said pseudo noise sequence generator, the number of pulses per period of the binary sequence is substantially twice as high as the maximum number of said subscribers connectible to the process bus system, the frequency of said square-wave oscillations is such that the maximum of the power density spectrum of said pulse sequence substantially corresponds to the band center frequency f_M of a predetermined frequency band having a band width B, and the number k of said square-wave oscillations per pulse of said binary sequence is such that 1/k substantially corresponds to the relative band width B/f_M.