EP0728581A2 - Système de bus pour une machine d'impression - Google Patents

Système de bus pour une machine d'impression Download PDF

Info

Publication number: EP0728581A2
Authority: EP; European Patent Office
Prior art keywords: bus; stations; station; connection; bus system
Prior art date: 1995-02-23
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.): Granted

Application number

EP96101643A

Other languages

German (de)

English (en)

Other versions

EP0728581B1 (fr

EP0728581A3 (fr

Inventor

Johannes Tenfelde

Michael Dotzert

Gerold Wende

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.)

Manroland AG

Original Assignee

MAN Roland Druckmaschinen AG

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.)

1995-02-23

Filing date

1996-02-06

Publication date

1996-08-28

1996-02-06 Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG

1996-08-28 Publication of EP0728581A2 publication Critical patent/EP0728581A2/fr

1997-05-21 Publication of EP0728581A3 publication Critical patent/EP0728581A3/fr

1998-09-02 Application granted granted Critical

1998-09-02 Publication of EP0728581B1 publication Critical patent/EP0728581B1/fr

2016-02-06 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0009—Central control units

Definitions

the invention relates to a bus system for a printing press according to the preamble of claim 1.
interference fields can also lead to a reduction in the transmission capacity, if not to a total transmission failure of the respective bus system, especially in the case of coax or twisted two-wire bus.
Magnetic or capacitive couplings of power lines, coupling of neighboring lines and currents in shielding lines may be mentioned here, for example.
Such faults also represent a severe impairment of the bus system, which occurs in particular when lines, particularly in the case of service lines, are not routed properly and come into close proximity with other line systems. Aging in components, particularly with optoelectronic signal transmission, is also a potential source of errors.
the object of the present invention is therefore to expand a bus system in accordance with the preamble of claim 1 such that, with a simple design, the disadvantages mentioned above are avoided and changes in the transmission capacity of the bus system can be detected as early as possible.
bus or bus system is also used here for transmission lines in which data is transmitted between neighboring stations in the manner of a loop.
At least one of the stations coupled to the bus system has a bus coupler which from time to time or each time the bus system is switched on (power-on) sends a signal sequence for the purpose of establishing a connection with the other station or stations to the bus system , wherein this signal output by the bus coupler takes place in such a way that at least one physical quantity of the line protocol on which the bus system is based lies outside an intended frame.
This can be done in particular in the case of optical fibers in such a way that, for example, a master station tries to establish a connection with low transmission power with the other stations via the bus system during a power-on, that is to say when the printing press and the control system are switched on.
the one station repeats this connection establishment with successively increasing transmission power.
the bus coupler only switches the intended one when all the addressed stations properly acknowledge the connection establishment - the acknowledgment is expediently carried out at the transmission power level provided in accordance with the line protocol Station to the intended transmission power and normal transmission takes place in the fault-free case.
an error source which has arisen as described at the outset will generally have the effect that the difference between the transmission power normally provided and the transmission power which is just minimally required to establish a connection is markedly smaller.
This can be determined by the bus coupler designed according to the invention and can be used, for example, to display a corresponding warning or even to trigger a system shutdown by blocking the printing press drive against starting.
the principle according to the invention is not only limited for use in bus systems which have glass fiber cables or optical fibers.
the transmission power with which a station tries to establish a connection to other stations does not have to be varied, but other physical variables can also be used in a manner that differs from the line protocol.
potential bus error sources can also be determined by carrying out the connection establishment with a different transmission frequency, with a bandwidth other than the intended one, with deliberate addition of secondary or interference frequencies and the like.
the criterion for determining the system reserve is the variation of a physical transmission variable, that is to say at which value the value of the varied physical variable is able to establish a proper connection between the stations.
each station has a bus coupler according to the invention. The transmission lines between adjacent stations are then checked.
Fig. 1 shows the printing units of a sheet-fed offset printing machine.
the individual printing units are assigned stations 1.1 to 1.5 designed as computers, which are in signal connection with one another via a common bus 2 designed as an optical waveguide.
a station 1.1 like the other stations 1.2 to 1.5 (not shown there), has a bus coupler 3, which consists of a transmitter 3.1 and receiver 3.2.
the transmitting and receiving parts 3.2 are used to send and receive signals of the bus 2 to and from the other stations 1.2 to 1.5.
the transmitting part 3.1 of the bus coupler 3 of the station 1.1 is in operative connection with a control and evaluation unit 4, so that 3 transmission signals with different signal power can be emitted on the bus 2 via the optoelectronics of the bus coupler.
the transmitting part 3.1 has a light transmitter that can be controlled in terms of light output.
the control and evaluation unit 4 determines the power with which the light transmitter feeds the optical signals into the optical waveguide.
control and evaluation unit 4 is in operative connection with a voltage supply of the printing press, not shown - via the transmitting part 3.1 of the bus coupler 3, controlled by the control and evaluation unit 4, a signal for Establishing contact with one or more the other stations 1.2 to 1.5 with reduced and then increasing transmission power is repeatedly delivered.
the control and evaluation unit 4 gradually increases the transmission power to establish a connection with the other stations 1.2 to 1.5 via the transmission part 3.1 of the bus coupler 3.
the transmission power of the normal signal exchange is identified by Pn.
the transmitting part 3.1 of the bus coupler 3 sends a total of three times signals for establishing a connection with a transmission power P which is in each case smaller than the normally provided transmission power Pn the bus 2 to understand a certain bit sequence as a serial bus.
the increase in transmission power P is gradually increased from signal output to signal output up to the intended transmission power value Pn.
the time diagram of FIG. 3 shown under the time diagram in FIG. 2 shows that only at time T1 one of the stations 1.1 to 1.5 recognized the signal sequence for the purpose of establishing a connection and accordingly sent it back to the transmitting station 1.1 with full transmission power.
a response signal A can thus be generated in the control and evaluation unit 4 which is operatively connected to the bus coupler 3 and which, here to be understood as an example, changes from 0 to 1 when the correct connection establishment has been acknowledged by one or more of the stations 1.1 to 1.5.
Stations 1.2 to 1.5 do not have to send the signals sent with reduced transmission power back to station 1.1 to acknowledge the correct connection establishment, but it is also possible for the correct connection establishment to be acknowledged by a predetermined signal or bit sequence.
control and evaluation unit 4 Since the control and evaluation unit 4, which is operatively connected to the bus coupler 3 of the station 1.1, has gradually increased the transmission power P and can also be determined by the control and evaluation unit 4 via the receiving part 3.2 of the bus coupler 3, at which point in time at which transmission power P The correct connection establishment has been acknowledged by one of the stations 1.2 to 1.5, it can now be determined how large the difference between the normally provided transmission power Pn and the minimum required Is transmission power for proper data traffic. A quality value can then be formed from this power difference, which shows how large the power reserve of the bus system is. If this previously defined performance difference falls below a predetermined limit value, it can be provided to display a warning and / or to block the drive of the printing press against starting.

Landscapes

Small-Scale Networks (AREA)
Inking, Control Or Cleaning Of Printing Machines (AREA)
Devices For Checking Fares Or Tickets At Control Points (AREA)
Computer And Data Communications (AREA)
Accessory Devices And Overall Control Thereof (AREA)
Optical Communication System (AREA)
Arrangements For Transmission Of Measured Signals (AREA)
Rotary Presses (AREA)

EP96101643A 1995-02-23 1996-02-06 Système de bus pour une machine d'impression Expired - Lifetime EP0728581B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE19506261		1995-02-23
DE19506261A DE19506261A1 (de)	1995-02-23	1995-02-23	Bussystem für eine Druckmaschine

Publications (3)

Publication Number	Publication Date
EP0728581A2 true EP0728581A2 (fr)	1996-08-28
EP0728581A3 EP0728581A3 (fr)	1997-05-21
EP0728581B1 EP0728581B1 (fr)	1998-09-02

Family

ID=7754807

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP96101643A Expired - Lifetime EP0728581B1 (fr)	1995-02-23	1996-02-06	Système de bus pour une machine d'impression

Country Status (5)

Country	Link
US (1)	US5730053A (fr)
EP (1)	EP0728581B1 (fr)
JP (1)	JP2766242B2 (fr)
AT (1)	ATE170458T1 (fr)
DE (2)	DE19506261A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0947322A1 (fr) *	1998-04-04	1999-10-06	MAN Roland Druckmaschinen AG	Organe de calcul pour une machine à imprimer

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE20000919U1 (de) *	2000-01-20	2000-03-09	MAN Roland Druckmaschinen AG, 63075 Offenbach	Überwachungseinrichtung für eine Druckmaschine
DE10311284B4 (de) *	2003-03-14	2005-11-24	Koenig & Bauer Ag	Druckmaschine mit zumindest zwei Druckwerken
DE10318541A1 (de) *	2003-04-24	2004-11-11	Koenig & Bauer Ag	Verfahren zur Messung, Dokumentation und Überwachung elektrischer Parameter

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPS60124760A (ja) *	1983-12-12	1985-07-03	Mitsubishi Electric Corp	バス監視装置
DE3642500A1 (de) *	1986-12-12	1988-06-23	Heidelberger Druckmasch Ag	System zur ein- und/oder ausgabe von signalen eines digitalen steuersystems
DE3839248A1 (de) *	1988-11-21	1990-05-23	Roland Man Druckmasch	Dezentraler steuerrechner, insbesondere innerhalb einer rotationsdruckmaschine, der ueber einen bus mit mehreren peripheren einheiten verbunden ist
DE4000295C2 (de) *	1990-01-08	1994-05-19	Heidelberger Druckmasch Ag	Vorrichtung zur Diagnose eines Steuersystems einer Druckmaschine
DE4113321A1 (de) *	1991-04-24	1992-10-29	Merten Gmbh & Co Kg Geb	Verfahren zur ueberwachung der funktion einer busankopplungseinheit
DE4237837A1 (fr) *	1991-11-21	1993-06-03	Koenig & Bauer Ag
DE4212742A1 (de) *	1992-04-16	1993-10-21	Bayerische Motoren Werke Ag	Verfahren zur Fehlererkennung bei einem Datenbus
DE4437417A1 (de) *	1993-10-19	1995-04-20	Deutsche Bundespost Telekom	Verfahren zur Überwachung von Digitalsignalverbindungen

1995
- 1995-02-23 DE DE19506261A patent/DE19506261A1/de not_active Withdrawn
1996
- 1996-02-06 DE DE59600488T patent/DE59600488D1/de not_active Expired - Fee Related
- 1996-02-06 EP EP96101643A patent/EP0728581B1/fr not_active Expired - Lifetime
- 1996-02-06 AT AT96101643T patent/ATE170458T1/de not_active IP Right Cessation
- 1996-02-21 US US08/607,262 patent/US5730053A/en not_active Expired - Fee Related
- 1996-02-23 JP JP8036913A patent/JP2766242B2/ja not_active Expired - Fee Related

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0947322A1 (fr) *	1998-04-04	1999-10-06	MAN Roland Druckmaschinen AG	Organe de calcul pour une machine à imprimer
US6522422B1 (en)	1998-04-04	2003-02-18	Man Roland Druckmaschinen Ag	Control computer for a printing machine

Also Published As

Publication number	Publication date
ATE170458T1 (de)	1998-09-15
EP0728581B1 (fr)	1998-09-02
DE19506261A1 (de)	1996-09-05
JP2766242B2 (ja)	1998-06-18
DE59600488D1 (de)	1998-10-08
JPH08267722A (ja)	1996-10-15
US5730053A (en)	1998-03-24
EP0728581A3 (fr)	1997-05-21

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