Patent US4254499A successfully refreshed from Google Patents.
US4254499A
Expired / Lapsed
US
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Signal transmission system in a digital controller system
Assignee: Toshiba Corp
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Filing: 1979-06-13
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Granted: 1981-03-03
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Expires: 1999-06-13
Abstract
Abstract A digital controller system with a hierarchy organization having a high level control section, a plurality of low level control sections which are monitored and controlled by the high level control section, and a plurality of loop station means connected to each low level control section for transmitting signals directly to a process variable circuit and receiving signals directly from the process variable circuit, a signal transmission system in which return and collation are effected for every word in the data transmission between the loop station means and the low level control sections, and return and collation for every word and transfer for every block are selectively carried out in the data transmission between the low level control sections and the high level control section.
Inventors
- 👤 Akishige Yoshikane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:57
CPC Classifications
G; G06; G06F; G06F15/00; G06F15/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
A signal transmission system in a digital controller system comprising a high level control section, a plurality of low level control sections which are monitored and controlled by said high level control section; and a plurality of loop station means connected to each low level control section, said plurality of loop station means transmitting signals directly to a process variable circuit and receiving signals directly from the process variable circuit, in which return and collation are effected for every word in data transmission between said loop station means and said low level control sections, and return and collation for every word and transfer for every block are selectively carried out in data transmission between said low level control sections and said high level control section.
Claim 2
Dependent Claim
125 words
A signal transmission system in a digital controller system comprising a high level control section, a plurality of low level control sections which are monitored and controlled by said high level control section; and a plurality of loop station means connected to each low level control section, said plurality of loop station means transmitting signals directly to a process variable circuit and receiving signals directly from the process variable circuit, in which return and collation are effected for every word in data transmission between said loop station means and said low level control sections, and return and collation for every word and transfer for every block are selectively carried out in data transmission between said low level control sections and said high level control section.
Claim 3
Dependent Claim
41 words
A signal transmission system as claimed in claim 1, in which said transfer for every block is effected from said low level control sections to said high level control section in response to an instruction from said high level control section.
Claim 4
Dependent Claim
96 words
A signal transmission system as claimed in claim 1, in which said high level control section comprises: a central processing unit; a synchronous receiver transmitter coupled to said central processing unit; a plurality of paired drivers and receivers which are provided in correspondence to said low level control sections and are connected to said asynchronous receiver transmitter; selecting means for selectively driving said plurality of paired driver and receivers in response to a signal from said central processing unit; a buffer memory connected to said central processing unit, for storing data from said asynchronous receiver transmitter.
Claim 5
Dependent Claim
175 words
A signal transmission system as claimed in claim 1, in which each of said low level control sections comprises: a central processing unit; at least one asynchronous receiver transmitter connected to said central processing unit; a driver and a receiver in one pair having first terminals connected to said asynchronous receiver transmitter and second terminals connected to said high level control circuit; a driver and a receiver in one pair having first terminals connected to said asynchronous receiver transmitter and second terminals connected to said plurality of loop station means; a decision circuit for deciding whether signal transmission is effected in word transfer or in block transfer with the aid of a signal supplied thereto through said receiver connected to said high level control section, to provide a decision result signal which is applied to said central processing unit; and selecting means for selecting said driver and receiver connected to said high level control section or said driver and receiver connected to said loop station means according to a signal from said central processing unit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |