JPS5523638A - Failure detection unit for transmission control unit - Google Patents

Failure detection unit for transmission control unit

Info

Publication number
JPS5523638A
JPS5523638A JP9613878A JP9613878A JPS5523638A JP S5523638 A JPS5523638 A JP S5523638A JP 9613878 A JP9613878 A JP 9613878A JP 9613878 A JP9613878 A JP 9613878A JP S5523638 A JPS5523638 A JP S5523638A
Authority
JP
Japan
Prior art keywords
output
failure
transmission control
failure detection
control unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9613878A
Other languages
Japanese (ja)
Inventor
Takeshi Nakano
Hitoshi Fushimi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP9613878A priority Critical patent/JPS5523638A/en
Publication of JPS5523638A publication Critical patent/JPS5523638A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)

Abstract

PURPOSE:To enable the localization of failure in the long distance transmission control system and the troubleshooting easily, by detecting the potential difference between the both ends of the termination resistor provided in the current loop and detecting a failure in the transmission line. CONSTITUTION:The waveform of the output data '1011001...' from the transmitter 1 is (a), and the output waveform of the transmission driver circuit 2 is (b), and if a failure such as open wire of the transmission line 11 is taken place, no current loop is constituted, no current I0 flows (C2), and no voltage difference is produced (d2) across the termination resistor 3. Further, the output of the comparator 12 is OFF, the output (e2) of the NOT gate 19 is at ''H''. In this case, the output (g2) of the one shot multivibrator 14 sets the error FF16 via the NAND gate 15 (h2) to detect the failure in the line.
JP9613878A 1978-08-09 1978-08-09 Failure detection unit for transmission control unit Pending JPS5523638A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9613878A JPS5523638A (en) 1978-08-09 1978-08-09 Failure detection unit for transmission control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9613878A JPS5523638A (en) 1978-08-09 1978-08-09 Failure detection unit for transmission control unit

Publications (1)

Publication Number Publication Date
JPS5523638A true JPS5523638A (en) 1980-02-20

Family

ID=14157022

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9613878A Pending JPS5523638A (en) 1978-08-09 1978-08-09 Failure detection unit for transmission control unit

Country Status (1)

Country Link
JP (1) JPS5523638A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5481200A (en) * 1993-09-15 1996-01-02 Rosemont Inc. Field transmitter built-in test equipment
US7098798B2 (en) 2003-08-07 2006-08-29 Rosemount Inc. Process device with loop override
US9182256B2 (en) 2009-07-09 2015-11-10 Rosemount Inc. Process variable transmitter with two-wire process control loop diagnostics
US20170093533A1 (en) 2015-09-30 2017-03-30 Rosemount Inc. Process variable transmitter with self-learning loop diagnostics

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5481200A (en) * 1993-09-15 1996-01-02 Rosemont Inc. Field transmitter built-in test equipment
US7098798B2 (en) 2003-08-07 2006-08-29 Rosemount Inc. Process device with loop override
US9182256B2 (en) 2009-07-09 2015-11-10 Rosemount Inc. Process variable transmitter with two-wire process control loop diagnostics
US20170093533A1 (en) 2015-09-30 2017-03-30 Rosemount Inc. Process variable transmitter with self-learning loop diagnostics
US10367612B2 (en) 2015-09-30 2019-07-30 Rosemount Inc. Process variable transmitter with self-learning loop diagnostics

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