EP0370223A2 - Decentralised control unit, particularly for a rotary printing press, linked by a bus to a plurality of peripheral units - Google Patents

Decentralised control unit, particularly for a rotary printing press, linked by a bus to a plurality of peripheral units Download PDF

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Publication number
EP0370223A2
EP0370223A2 EP89119106A EP89119106A EP0370223A2 EP 0370223 A2 EP0370223 A2 EP 0370223A2 EP 89119106 A EP89119106 A EP 89119106A EP 89119106 A EP89119106 A EP 89119106A EP 0370223 A2 EP0370223 A2 EP 0370223A2
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EP
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Prior art keywords
analog
bus
control computer
digital
signals
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EP89119106A
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German (de)
French (fr)
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EP0370223A3 (en
EP0370223B1 (en
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Christian Schlegel
Claus Walter
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Manroland AG
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MAN Roland Druckmaschinen AG
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Priority to AT89119106T priority Critical patent/ATE100761T1/en
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Publication of EP0370223A3 publication Critical patent/EP0370223A3/en
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    • 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

  • Decentralized control computer in particular within a rotary printing press, which is connected to several peripheral units via a bus.
  • the invention relates to a control computer, in particular within a rotary printing press, which is connected to a plurality of peripheral units via a bus, such as ink zone adjusting devices, web tension measuring or regulating devices, register adjusting devices, or the like.
  • decentralized control computers are used in printing presses, preferably in rotary printing presses, with the aid of which, on the one hand, adjustment processes and, on the other hand, measurement processes are carried out at various points within part of the printing press.
  • these stations to be operated by the control computer are a few meters away from the control computer.
  • the number of peripheral stations to be operated by the control computer is also often very high, for example between 20 and 54 color sliders in the individual inking units of the printing units, which are adjusted by a motor and the position of which is electronically recorded.
  • Measuring and adjusting or regulating processes should also often be carried out at high speed, for example in order to achieve a control accuracy of a few parts per thousand in the setting of the color slide.
  • a digital-analog bus which transmits addresses and data in the form of digital signals from the control computer to a plurality of peripheral units, after addressing a peripheral unit, transmits analog signals from the latter to the control computer on a separate part of the bus.
  • a large number of peripheral units or stations can be addressed and transmitted to these control commands, for example for changing servomotors on color slides, and the analog signals recorded in the peripheral unit can be fed to the control unit with high precision and evaluated therein.
  • actuators etc. as well as devices recording measured values are controlled via the mixed digital-analog bus according to the invention.
  • Addresses and data or control commands are transmitted in digital form via the digital part of the bus, and analog actual values, which are to be recorded in the peripheral units and evaluated in the control computer, are transmitted via the analog part of the data bus.
  • the address recognition and the processing of the control commands each take place in the peripheral unit.
  • the control computer 1 indicated in FIG. 1 is preferably used in a printing press, for example in a web-fed printing press or in a sheet-fed printing press.
  • a printing press for example, a web-fed printing press or in a sheet-fed printing press.
  • the ink slides used in the various printing units on inking units are monitored in their position relative to an ink fountain roller and adjusted or regulated at certain predetermined intervals.
  • the peripheral units 2 shown in the drawings are suitable for such an application.
  • a bus 3 is provided between the control computer 1 and the peripheral units 2, which in the embodiment according to the invention is designed in the form of a ribbon cable.
  • a bus is generally understood to mean a number of lines which lead to more than two stations from a central station and each station has specific access to the individual lines of the bus, that is to say is usually addressable.
  • the bus 3 according to the invention comprises an address part 4, a data or control part 5, an analog part 6 and a supply part 7.
  • the address part 4 and the data part or control part 5 are designated as digital part 9 and the analog part 6 generally with 10.
  • the individual lines (FIG. 3) of the bus 3 are each connected to a peripheral unit 2 via a plug connection 11, specifically via a stub line or via a connecting part 12. It is advantageous to design the plug connection 11 in the context of the invention as a so-called “struck plug connection”, as indicated in FIG. 1.
  • the bus is shown broken off at 13, but can be of any length, so to speak.
  • the addresses in the form of digital signals are transmitted to all peripheral units simultaneously via latched digital bus drivers 15. The same thing happens simultaneously in data part 5 of the bus for the transmission of control commands.
  • the digital information forming the addresses is thus transmitted from the peripheral units 2 to the control computer 1 via the analog part 6 of the bus 3 for the purpose of transmitting analog signals latched, ie kept unchanged in voltage potential on the line.
  • the digital voltage signals settle on the bus after a certain time, depending on the length and other physical properties of the line, so that quasi-steady-state voltage states then arise during the transmission of the analog signals.
  • At least one line 4 is required for the transmission of data from the control computer 1 to the peripheral unit 2, as can be seen from FIG. 3.
  • several address lines and possibly data lines are used, for example four lines, in order, for example, to be able to transmit four address bits simultaneously.
  • Each of the peripheral units 2 comprises an address recognition circuit 17, with the aid of which it is recognized which of the peripheral units 2 has been selected by the control computer 1. After a certain peripheral unit 2 has recognized the address assigned to it in the address part 4 of the bus 3, the control information lying on the data or control part 5 can be passed on to the selected peripheral unit 2. This is done by means of a write signal on the write line 8, which ensures that the selected peripheral unit takes over the control information.
  • ink zone servomotors 21 can be adjusted via a control command processing circuit 18.
  • the adjustment of a color slide usually also requires an adjustment of the potentiometer 22 assigned to it, which is connected to the motor 21 via an adjustment mechanism 23.
  • analog signals are only transmitted from the peripheral unit 2 to the central computer 1 after the digital signals have settled, so that the analog measurement results on the bus 3 cannot be falsified by them. e.g. in the form of coupled voltage peaks, or by the edges of the digital signals or by reflections, etc.
  • transients in the form of level changes on the digital bus 4, 5 are prevented so that they cannot crosstalk to the analog bus 6.
  • analog signals are transmitted differentially, ie two lines 27, 28, as indicated at 29, are always used for the transmission of voltage values taken from the potentiometer 22 and fed to a differential amplifier 26 in the control computer 1 , which determines the analog signal to be measured as the difference between the two voltage values and feeds this difference to an analog-digital converter.
  • the then digitized signals can then be evaluated in the control computer 1, which can possibly lead to an adjustment of an actuating device, for example a color slide actuator in a peripheral unit. This adjustment would then be carried out by means of digital address or control data via the address part 4 or data part 5. For each peripheral unit 2, this gives an individual reference point for the measurement, which reduces errors due to voltage drops and interference radiation.
  • the voltage supply in the peripheral units 2, for example the potentiometer 22, takes place from the control computer 1 via two analog reference lines 30 and 31, the lines 30 and 31 in the peripheral unit 2 and in the control computer 1 are buffered and decoupled by the circuits 25, 32, 33.
  • Line 30 carries a positive reference signal coming from the output of the analog-digital converter 16 and line 31 carries an O-volt reference signal. This enables a high degree of reducibility of the measurement, because deviations in the reference voltage are not included in the measurement.
  • all lines, i.e. 27, 28, 30, 31 of the analog bus 6 are terminated with high impedance by buffers 32, 33 in the peripheral unit 2 or by the differential amplifier 26 in the control computer 1.
  • the analog part 6 is thus surrounded on both sides by lines with a stable voltage potential, on the one hand through the power supply line 7 and on the other hand from the digital part 4 or 5, which, as described above, during the measurement and transmission of analog information or signals is kept stable.

Abstract

A bus 3 which has an analog component 10 and a digital component 9 is provided between a control unit 1 and peripheral units 2, preferably in a rotary printing press. The peripheral units 2 connect to the databus 3 via fixed plug-in connections 11. Control information is transmitted into a peripheral unit by means of a write signal. The transmission of analog signals from the peripheral control units 2 to the control unit 1 occurs in each case when the digital address and control signals at the digital component 9 are in a steady state. The measurement of the analog values is then initiated. <IMAGE>

Description

Dezentraler Steuerrechner, insbesondere innerhalb einer Rotationsdruckmaschine, der über einen Bus mit mehreren peripheren Einheiten verbunden ist.Decentralized control computer, in particular within a rotary printing press, which is connected to several peripheral units via a bus.

Die Erfindung betrifft einen Steuerrechner, insbesondere innerhalb einer Rotationsdruckmaschine, der über einen Bus mit mehreren peripheren Einheiten verbunden ist, wie Farbzonenstellvorrichtungen, Bahnspannungsmeß- oder Regeleinrichtungen, Registerstellvorrichtungen, oder dergleichen.The invention relates to a control computer, in particular within a rotary printing press, which is connected to a plurality of peripheral units via a bus, such as ink zone adjusting devices, web tension measuring or regulating devices, register adjusting devices, or the like.

Es ist bekannt, daß in Druckmaschinen, vorzugsweise in Rotationsdruckmaschinen, dezentrale Steuerrechner verwendet werden, mit deren Hilfe an verschiedenen Stellen innerhab eines Teils der Druckmaschine zum einen Einstellvorgänge und zum anderen Meßvorgänge durchgeführt werden. Häufig sind diese durch den Steuerrechner zu bedienenden Stationen einige Meter von dem Steuerrechner entfernt. Die Anzahl der vom Steuerrechner zu bedienenden peripheren Stationen ist zudem oft sehr hoch, beispielsweise zwischen je 20 und 54 Farbschiebern in den einzelnen Farbwerken der Druckeinheiten, die motorisch verstellt werden und deren Stellung elektronisch erfaßt wird. Meß- und Stell- bzw. Regelvorgänge sollen zudem häufig mit einer hohen Geschwindigkeit vorgenommen werden, beispielsweise um eine Regelgenauigkeit von einigen Promille bei der Farbschiebereinstellung zu erreichen. Hierfür bedarf es aufwendiger elektronischer Einrichtungen im Hardware- und im Softwarebereich und einen erheblichen Aufwand an Übertragungsleitungen, die häufig abgeschirmt sind, um Störeinflüsse von außen und zwischen den einzelnen Übertragungsleitungen zu vermeiden.It is known that decentralized control computers are used in printing presses, preferably in rotary printing presses, with the aid of which, on the one hand, adjustment processes and, on the other hand, measurement processes are carried out at various points within part of the printing press. Frequently, these stations to be operated by the control computer are a few meters away from the control computer. The number of peripheral stations to be operated by the control computer is also often very high, for example between 20 and 54 color sliders in the individual inking units of the printing units, which are adjusted by a motor and the position of which is electronically recorded. Measuring and adjusting or regulating processes should also often be carried out at high speed, for example in order to achieve a control accuracy of a few parts per thousand in the setting of the color slide. This requires complex electronic equipment in the hardware and software area and a considerable outlay on transmission lines, which are often shielded, in order to avoid interference from outside and between the individual transmission lines.

Hiervon ausgehend ist es die Aufgabe der vorliegenden Erfindung einen Steuerrechner mit einem zu mehreren peripheren Einheiten führenden Bus so weiterzubilden, daß trotz einfacher Leitungsausführung des Busses eine präzise Messung der Analogwerte in den peripheren Einheiten in dem Steuerrechner möglich ist und daß insbesondere eine möglichst störungslose, d.h. unverfälschte Übertragung der Analogsignale zu dem Zentralrechner erfolgen kann.Proceeding from this, it is the object of the present invention to develop a control computer with a bus leading to a plurality of peripheral units in such a way that a precise measurement of the analog values in the peripheral units in the control computer is possible despite the simple line design of the bus and In particular, the transmission of the analog signals to the central computer can be carried out as undisturbed as possible, ie, unadulterated.

Diese Aufgabe wird dadurch gelöst, daß ein von dem Steuerrechner zu mehreren peripheren Einheiten Adressen und Daten in Form von digitalen Signalen übertragender Digital-Analog-Bus nach erfolgter Adressierung einer peripheren Einheit von dieser zum Steuerrechner auf einem separaten Teil des Busses Analogsignale überträgt.This object is achieved in that a digital-analog bus which transmits addresses and data in the form of digital signals from the control computer to a plurality of peripheral units, after addressing a peripheral unit, transmits analog signals from the latter to the control computer on a separate part of the bus.

Gemäß der Erfindung kann eine große Anzahl von peripheren Einheiten bzw. Stationen adressiert und an diese Steuerbefehle, beispielsweise zur Veränderung von Stellmotoren an Farbschiebern übertragen werden und dem Steuerrechner können die in der peripheren Einheit erfaßten Analogsignale mit hoher Präzision zugeführt und in diesem ausgewertet werden. In den peripheren Einheiten werden also sowohl Stellantriebe etc. als auch meßwerterfassende Einrichtungen über den erfindungsgemäßen gemischten Digital-Analog-Bus angesteuert. Über den Digitalteil des Busses werden in digitaler Form Adressen und Daten beziehungsweise Steuerbefehle übertragen und über den analogen Teil des Datenbusses analoge Istwerte, die in den peripheren Einheiten erfaßt und in dem Steuerrechner ausgewertet werden sollen. Die Adreß-Erkennung und die Verarbeitung der Steuerbefehle erfolgt jeweils in der peripheren Einheit.According to the invention, a large number of peripheral units or stations can be addressed and transmitted to these control commands, for example for changing servomotors on color slides, and the analog signals recorded in the peripheral unit can be fed to the control unit with high precision and evaluated therein. In the peripheral units, therefore, actuators etc. as well as devices recording measured values are controlled via the mixed digital-analog bus according to the invention. Addresses and data or control commands are transmitted in digital form via the digital part of the bus, and analog actual values, which are to be recorded in the peripheral units and evaluated in the control computer, are transmitted via the analog part of the data bus. The address recognition and the processing of the control commands each take place in the peripheral unit.

Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der Beschreibung in Verbindung mit den Zeichnungen. Diese zeigen:

  • Fig. 1 Eine schematische Übersicht des erfindungsgemäßen Steuerrechners mit Analog-Digital-Bus und peripheren Einheiten;
  • Fig. 2 eine detailliertere Darstellung der Ausführung gemäß Fig. 1 und
  • Fig. 3 die Leitungsführung zwischen dem Steuerrechner und einer peripheren Einheit.
Advantageous developments of the invention result from the subclaims and the description in conjunction with the drawings. These show:
  • Fig. 1 is a schematic overview of the control computer according to the invention with analog-digital bus and peripheral units;
  • Fig. 2 shows a more detailed representation of the embodiment of FIG. 1 and
  • Fig. 3 shows the routing between the control computer and a peripheral unit.

Der in Fig. 1 angedeutete Steuerrechner 1 wird vorzugsweise in einer Druckmaschine, beispielsweise in einer Rollenrotationsdruckmaschine oder in einer Bogendruckmaschine verwendet. In solchen Druckmaschinen werden beispielsweise die in den verschiedenen Druckwerken an Farbwerken verwendeten Farbschieber in ihrer Position zu einer Farbkastenwalze überwacht und auf bestimmten vorgegebenen Abständen eingestellt, beziehungsweise geregelt. Die in den Zeichnungen dargestellten peripheren Einheiten 2 sind für einen derartigen Einsatz geeignet. Zwischen dem Steuerrechner 1 und den peripheren Einheiten 2 ist ein Bus 3 vorgesehen, der bei der Ausführung gemäß der Erfindung in Form eines Flachbandkabels ausgebildet ist. Unter einem Bus versteht man hier allgemein eine Anzahl von Leitungen, die zu mehr als zwei Stationen von einer Zentralstation aus führen und wobei jede Station gezielt Zugriff zu den einzelnen Leitungen des Busses hat, also üblicherweise adressierbar ist.The control computer 1 indicated in FIG. 1 is preferably used in a printing press, for example in a web-fed printing press or in a sheet-fed printing press. In such printing presses, for example, the ink slides used in the various printing units on inking units are monitored in their position relative to an ink fountain roller and adjusted or regulated at certain predetermined intervals. The peripheral units 2 shown in the drawings are suitable for such an application. A bus 3 is provided between the control computer 1 and the peripheral units 2, which in the embodiment according to the invention is designed in the form of a ribbon cable. A bus is generally understood to mean a number of lines which lead to more than two stations from a central station and each station has specific access to the individual lines of the bus, that is to say is usually addressable.

Der erfindungsgemäße Bus 3 umfaßt einen Adreßteil 4, einen Daten- beziehungsweise Steuerteil 5, einen Analogteil 6 und einen Versorgungsteil 7. In Fig. 1 ist der Adreßteil 4 und der Datenteil beziehungsweise Steuerteil 5 als Digitalteil 9 und der Analogteil 6 allgemein mit 10 bezeichnet. Die einzelnen Leitungen (Fig. 3) des Busses 3 stehen über eine Steckverbindung 11 jeweils mit einer peripheren Einheit 2 und zwar über eine Stichleitung beziehungsweise über ein Anschlußteil 12 in Verbindung. Es ist vorteilhaft, die Steckverbindung 11 im Rahmen der Erfindung als sogenannte "angeschlagene Steckverbindung" auszubilden, wie in Fig. 1 angedeutet ist. Der Bus ist bei 13 abgebrochen dargestellt, kann quasi aber beliebig lang sein.The bus 3 according to the invention comprises an address part 4, a data or control part 5, an analog part 6 and a supply part 7. In FIG. 1, the address part 4 and the data part or control part 5 are designated as digital part 9 and the analog part 6 generally with 10. The individual lines (FIG. 3) of the bus 3 are each connected to a peripheral unit 2 via a plug connection 11, specifically via a stub line or via a connecting part 12. It is advantageous to design the plug connection 11 in the context of the invention as a so-called “struck plug connection”, as indicated in FIG. 1. The bus is shown broken off at 13, but can be of any length, so to speak.

Über den Adreßteil 4 des Busses 3 werden die Adressen in Form von Digitalsignalen jeweils an alle peripheren Einheiten über gelatchte Digital-Bus-Treiber 15 gleichzeitig übertragen. Das gleiche geschieht gleichzeitig im Datenteil 5 des Busses zur Übertragung von Steuerbefehlen. Die die Adressen bildenden Digitalinformationen werden zwecks Übertragung von Analogsignalen über den Analogteil 6 des Busses 3 von den peripheren Einheiten 2 zum Steuerrechner 1 also gelatcht, d.h. in ihrem Spannungspotential unverändert auf der Leitung gehalten. Die digitalen Spannungssignale schwingen sich auf den Bus nach einer bestimmten Zeit, in Abhängigkeit von der Länge und anderen physikalischen Eigenschaften der Leitung, ein, so daß dann quasi stationäre Spannungszustände bei der Übertragung der Analogsignale entstehen. Für die Übertragung von Daten von dem Steuerrechner 1 zu der peripheren Einheit 2 ist mindestens eine Leitung 4 erforderlich, wie aus Fig. 3 hervorgeht. Bei höheren Anforderungen an die Geschwindigkeit beziehungsweise bei einer entsprechend hohen Anzahl von peripheren Geräten werden selbstverständlich mehrere Adressenleitungen und ggf. Datenleitungen verwendet, z.B. vier Leitungen, um z.B. vier Adressen-Bits gleichzeitig übertragen zu können.Via the address part 4 of the bus 3, the addresses in the form of digital signals are transmitted to all peripheral units simultaneously via latched digital bus drivers 15. The same thing happens simultaneously in data part 5 of the bus for the transmission of control commands. The digital information forming the addresses is thus transmitted from the peripheral units 2 to the control computer 1 via the analog part 6 of the bus 3 for the purpose of transmitting analog signals latched, ie kept unchanged in voltage potential on the line. The digital voltage signals settle on the bus after a certain time, depending on the length and other physical properties of the line, so that quasi-steady-state voltage states then arise during the transmission of the analog signals. At least one line 4 is required for the transmission of data from the control computer 1 to the peripheral unit 2, as can be seen from FIG. 3. With higher demands on the speed or with a correspondingly high number of peripheral devices, of course, several address lines and possibly data lines are used, for example four lines, in order, for example, to be able to transmit four address bits simultaneously.

Jede der peripheren Einheiten 2 umfaßt eine Adreßerkennungsschaltung 17, mit deren Hilfe erkannt wird, welche der peripheren Einheiten 2 von dem Steuerrechner 1 her ausgewählt wurde. Nachdem eine bestimmte periphere Einheit 2 die ihr zugeordnete Adresse im Adreßteil 4 des Busses 3 erkannt hat, können die auf dem Daten- beziehungsweise Steuerteil 5 liegenden Steuerinformationen an die ausgewählte periphere Einheit 2 gegeben werden. Dies geschieht mittels eines Schreibsignales auf der Schreibleitung 8, die dafür sorgt, daß die ausgewählte Peripherie-Einheit die Steuerinformationen übernimmt. So können beispielsweise Farbzonenstellmotoren 21 über eine Steuerbefehl-­Verarbeitungsschaltung 18 verstellt werden. Die Verstellung eines Farbschiebers (nicht gezeigt) bedingt überlicherweise auch eine Verstellung des diesem zugeordneten Potentiometers 22, das über eine Verstellmechanik 23 mit dem Motor 21 in Verbindung steht.Each of the peripheral units 2 comprises an address recognition circuit 17, with the aid of which it is recognized which of the peripheral units 2 has been selected by the control computer 1. After a certain peripheral unit 2 has recognized the address assigned to it in the address part 4 of the bus 3, the control information lying on the data or control part 5 can be passed on to the selected peripheral unit 2. This is done by means of a write signal on the write line 8, which ensures that the selected peripheral unit takes over the control information. For example, ink zone servomotors 21 can be adjusted via a control command processing circuit 18. The adjustment of a color slide (not shown) usually also requires an adjustment of the potentiometer 22 assigned to it, which is connected to the motor 21 via an adjustment mechanism 23.

Der Istwert eines Farbschiebers ist somit mittels des Potentiometers 22 jeweils in der peripheren Einheit ermittelbar, wie im Zusammenhang mit Fig. 3 im einzelnen beschrieben wird.The actual value of a color slide can thus be determined in each case in the peripheral unit by means of the potentiometer 22, as will be described in detail in connection with FIG. 3.

Das sogenannte "Einlatchen" von Adressen und Daten auf dem Bus 3 wird so festgelegt, daß sichergestellt ist, daß auch bei sehr langen Leitungen die Digitalsignale sich eingeschwungen haben, d.h. daß auf dem Peripherie- und dem Adreßbus 3 beziehungsweise 4 ein quasi stationärer Spannungs-Zustand herrscht.The so-called "latching" of addresses and data on the bus 3 is determined in such a way that it is ensured that even with very long ones Lines that have settled digital signals, ie that there is a quasi-stationary voltage state on the peripheral and address bus 3 and 4 respectively.

Gemäß der Erfindung erfolgt nach dem Erkennen einer Adresse in einer peripheren Einheit 2 die Übertragung von Analogsignalen von der peripheren Einheit 2 zu dem Zentralrechner 1 erst nach dem Einschwingen der Digitalsignale, so daß durch diese die analogen Meßergebnisse auf dem Bus 3 nicht verfälscht werden können, z.B. in Form von übergekoppelten Spannungsspitzen, beziehungsweise durch die Flanken der Digitalsignale oder durch Reflektionen usw.. Bei der Erfindung werden somit sogenannte Transienten in Form von Pegeländerungen auf dem Digitalbus 4, 5 verhindert, so daß diese nicht auf den Analogbus 6 übersprechen können.According to the invention, after an address has been recognized in a peripheral unit 2, analog signals are only transmitted from the peripheral unit 2 to the central computer 1 after the digital signals have settled, so that the analog measurement results on the bus 3 cannot be falsified by them. e.g. in the form of coupled voltage peaks, or by the edges of the digital signals or by reflections, etc. In the invention, so-called transients in the form of level changes on the digital bus 4, 5 are prevented so that they cannot crosstalk to the analog bus 6.

Erst wenn die Daten- und Adreßsignale im eingeschwungenen Zustand auf den Digitalteilen 4, 5 vorliegen, erfolgt durch die Übertragung eines Schreibsignals über eine Leitung 8, angesteuert durch die Treiberschaltung 14, im Analog-Bus 6 die Einleitung der Analogsignalübertragung von einer adressierten peripheren Einheit 2 zu dem Steuerrechner 1, wobei die Schalter 20 in der peripheren Einheit 2 geschlossen werden, so daß z.B. die von einem Potientiometer 22 abgegriffenen Spannungswerte über eine Analog-Istwerterfassungsschaltung 19 zum Analogteil 6 des Busses 3 zugeführt werden können, der diese zur Auswertung an den Steuerrechner 1 überträgt.Only when the data and address signals are in the steady state on the digital parts 4, 5, is the transmission of a write signal via a line 8, controlled by the driver circuit 14, in the analog bus 6, the initiation of the analog signal transmission from an addressed peripheral unit 2 to the control computer 1, the switches 20 in the peripheral unit 2 being closed, so that, for example the voltage values picked up by a potentiometer 22 can be fed via an analog actual value detection circuit 19 to the analog part 6 of the bus 3, which transmits them to the control computer 1 for evaluation.

Ein weiteres wesentliches Merkmal der Erfindung besteht darin, daß die analogen Signale differentiell übertragen werden, d.h. es werden stets zwei Leitungen 27, 28, wie bei 29 angedeutet, für die Übertragung von am Potentiometer 22 abgenommenen Spannungswerten verwendet und einem Differenzverstärker 26 im Steuerrechner 1 zugeleitet, der das zu messende Analogsignal als Differenz aus den beiden Spannungswerten ermittelt und diese Differenz einem Analog-Digitalwandler zuführt. Anschließend können die dann digitalisierten Signale in dem Steuerrechner 1 ausgewertet werden, was ggf. zu einer Nachstellung einer Stelleinrichtung, beispielsweise eines Farbschieberstellmotors in einer peripheren Einheit führen kann. Diese Nachstellung würde dann mittels digitalen Adreß- beziehungsweise Steuerdaten über den Adreßteil 4 bzw. Datenteil 5 vorgenommen werden. Für jede periphere Einheit 2 erhält man dadurch einen individuellen Bezugspunkt für die Messung, wodurch Fehler durch Spannungsabfälle und Störstrahlung reduziert werden.Another essential feature of the invention is that the analog signals are transmitted differentially, ie two lines 27, 28, as indicated at 29, are always used for the transmission of voltage values taken from the potentiometer 22 and fed to a differential amplifier 26 in the control computer 1 , which determines the analog signal to be measured as the difference between the two voltage values and feeds this difference to an analog-digital converter. The then digitized signals can then be evaluated in the control computer 1, which can possibly lead to an adjustment of an actuating device, for example a color slide actuator in a peripheral unit. This adjustment would then be carried out by means of digital address or control data via the address part 4 or data part 5. For each peripheral unit 2, this gives an individual reference point for the measurement, which reduces errors due to voltage drops and interference radiation.

Des weiteren ist es eine vorteilhafte Maßnahme, daß die Spannungsversorgung in den peripheren Einheiten 2, beispielsweise des Potentiometers 22 von dem Steuerrechner 1 her über zwei analoge Referenzleitungen 30 und 31 erfolgt, wobei die Leitungen 30 und 31 in der peripheren Einheit 2 und in dem Steuerrechner 1 durch die Schaltungen 25, 32, 33 abgepuffert und entkoppelt sind. Die Leitung 30 führt ein positives Referenzsignal vom Ausgang des Analog-­Digitalumwandlers 16 kommend und die Leitung 31 ein O-Volt-­Referenzsignal. Dadurch wird eine hohe Reduzierbarkeit der Messung erreicht, denn Abweichungen der Referenzspannung gehen nicht in die Messung ein.Furthermore, it is an advantageous measure that the voltage supply in the peripheral units 2, for example the potentiometer 22, takes place from the control computer 1 via two analog reference lines 30 and 31, the lines 30 and 31 in the peripheral unit 2 and in the control computer 1 are buffered and decoupled by the circuits 25, 32, 33. Line 30 carries a positive reference signal coming from the output of the analog-digital converter 16 and line 31 carries an O-volt reference signal. This enables a high degree of reducibility of the measurement, because deviations in the reference voltage are not included in the measurement.

In vorteilhafter Weise sind alle Leitungen, d.h. 27, 28, 30, 31 des Analogbusses 6 hochohmig durch Puffer 32, 33 in der peripheren Einheit 2 bzw. durch den Differenzverstärker 26 im Steuerrechner 1 abgeschlossen.Advantageously, all lines, i.e. 27, 28, 30, 31 of the analog bus 6 are terminated with high impedance by buffers 32, 33 in the peripheral unit 2 or by the differential amplifier 26 in the control computer 1.

Dadurch erfolgt quasi eine stromlose Übertragung der Ist-Wert-­Analogsignale und der Referenzspannungen, so daß Fehler durch Spannungsabfälle auf den Leitungen und an den Busankopplungen vermieden bzw. reduziert werden.This results in a currentless transmission of the actual value analog signals and the reference voltages, so that errors caused by voltage drops on the lines and on the bus connections are avoided or reduced.

Der Analogteil 6 ist somit gemäß der Erfindung beidseitig von Leitungen mit stabilem Spannungs-Potential umgeben, und zwar einerseits durch die Stromversorgungsleitung 7 und andererseits von dem Digitalteil 4 bzw. 5 her, das, wie vorangehend beschrieben wurde, während der Messung und Übertragung von Analoginformation beziehungsweise -signalen stabilgehalten wird.According to the invention, the analog part 6 is thus surrounded on both sides by lines with a stable voltage potential, on the one hand through the power supply line 7 and on the other hand from the digital part 4 or 5, which, as described above, during the measurement and transmission of analog information or signals is kept stable.

Die vorbeschriebene Erfindung eignet sich besonders im Zusammenhang mit der Steuerung von einzelnen Aggregaten in Rotationsdruckmaschinen, jedoch versteht es sich, daß in vorteilhafter Weise das erfindungsgemäße Prinzip auch anderweitig mit Erfolg eingesetzt werden kann, beispielsweise bei der Steuerung von Werkzeugmaschinen.The above-described invention is particularly suitable in connection with the control of individual units in rotary printing presses, but it goes without saying that the principle according to the invention can advantageously also be used successfully in other ways, for example in the control of machine tools.

Claims (11)

1. Steuerrechner, insbesondere innerhalb einer Rotationsdruckmaschine, der über einen Bus mit mehreren peripheren Einheiten verbunden ist, wie Farbzonenstellvorrichtungen, Bahnspannungsmeß- oder Regeleinrichtungen, Registerstellvorrichtungen, oder dgl., dadurch gekennzeichnet, daß ein von dem Steuerrechner (1) zu mehreren peripheren Einheiten (2) Adressen und Daten in Form von digitalen Signalen übertragender Digital-Analog-Bus (3) nach erfolgter Adressierung einer peripheren Einheit (2) von dieser zum Steuerrechner (1) auf einem separaten Teil (6) des Busses (3) Analogsignale überträgt.1. Control computer, in particular within a rotary printing press, which is connected via a bus to several peripheral units, such as ink zone setting devices, web tension measuring or control devices, register setting devices, or the like, characterized in that one of the control computer (1) to a plurality of peripheral units ( 2) Addresses and data in the form of digital signals-transmitting digital-analog bus (3) after addressing a peripheral unit (2) from this to the control computer (1) on a separate part (6) of the bus (3) transmits analog signals. 2. Steuerrechner nach Anspruch 1, dadurch gekennzeichnet, daß die Analogsignale über den Analogteil (6) des Busses (3) übertragen werden, nachdem die digitalen Signale für die Daten und Adressen auf dem Digitalteil (4, 5) einen eingeschwungenen quasi stationären Spannungs-Zustand einnehmen, und daß während der Übertragung der Analogsignale die Digitalsignale auf dem Bus (3) aufrechterhalten, aber nicht verändert werden.2. Control computer according to claim 1, characterized in that the analog signals are transmitted via the analog part (6) of the bus (3) after the digital signals for the data and addresses on the digital part (4, 5) a steady quasi-stationary voltage Take state, and that the digital signals on the bus (3) are maintained but not changed during the transmission of the analog signals. 3. Steuerrechner nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Bus (3) ein Flachbandkabel ist, das einen digitalen Teil (4, 5) einen Analogteil (6) und einen Stromversorgungsteil (7) aufweist.3. Control computer according to claim 1 or 2, characterized in that the bus (3) is a ribbon cable having a digital part (4, 5), an analog part (6) and a power supply part (7). 4. Steuerrechner nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Analogteil (6) des Busses (3) beidseitig von Leitungen (5, 7) mit stabilem Spannungs-Potential umgeben ist.4. Control computer according to one of the preceding claims, characterized in that the analog part (6) of the bus (3) is surrounded on both sides by lines (5, 7) with a stable voltage potential. 5. Steuerrechner, nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Übertragung der Analogsignale auf dem Analogteil (6) erfolgt, nachdem alle digitalen Signale einen eingeschwungenen Zustand eingenommen haben und daß nach der Dekodierung einer Adresse in einer bestimmten peripheren Einheit (2) auf eine Leitung (8) des Digitalteils (9) des Busses (3) ein Schreibsignal gelegt wird, dessen Pegel während der Übertragung der Analogsignale nicht verändert wird.5. Control computer, according to one of the preceding claims, characterized in that the transmission of the analog signals on the analog part (6) takes place after all digital signals have assumed a steady state and that after the decoding of an address in a certain peripheral unit (2) a write signal is placed on a line (8) of the digital part (9) of the bus (3), the level of which is not changed during the transmission of the analog signals. 6. Steuerrechner nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß als Analog-Istwert im Steuerrechner (1) die Spannungsdifferenz zwischen zwei auf Leitungen (27, 28) des Analogteils (6) des Busses (3) übertragenen Analogsignalen in einem Differenzverstärker (26) ermittelt wird.6. Control computer according to one of the preceding claims, characterized in that as the actual analog value in the control computer (1) the voltage difference between two on lines (27, 28) of the analog part (6) of the bus (3) transmitted analog signals in a differential amplifier (26 ) is determined. 7. Steuerrechner nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß vom Steuerrechner (1) zwei Referenzleitungen (30, 31) im Analogteil (6) des Busses (3) geführt sind, die zu den peripheren Einheiten (2) eine O-V-Referenzspannung und eine von einem Analogwandler (16) im Steuerrechner (1) abgeleiteten positiven Referenzspannung übertragen, die dort als Speisespannung für Potentiometer, Istwertgeber, Tachogeneratoren u.dgl. dienen.7. Control computer according to one of the preceding claims, characterized in that the control computer (1) has two reference lines (30, 31) in the analog part (6) of the bus (3) which lead to the peripheral units (2) an OV reference voltage and transmit a positive reference voltage derived from an analog converter (16) in the control computer (1), which is used there as a supply voltage for potentiometers, actual value transmitters, tachometer generators and the like. serve. 8. Steuerrechner nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Analogteil (6) hochohmig abgeschlossen ist.8. Control computer according to one of the preceding claims, characterized in that the analog part (6) is terminated with high resistance. 9. Steuerrechner nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Analogteil (6) des Busses (3) im Steuerrechner (1) und in den peripheren Einheiten (2) durch Pufferschaltungen (25′, 32, 33) abgeschlossen und entkoppelt ist.9. Control computer according to one of the preceding claims, characterized in that the analog part (6) of the bus (3) in the control computer (1) and in the peripheral units (2) by buffer circuits (25 ', 32, 33) is completed and decoupled . 10. Steuerrechner nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die peripheren Einheiten (2) mit dem Bus (3) in Form eines Flachbandkabels über angeschlagene Steckverbindungen (11) verbunden sind.10. Control computer according to one of the preceding claims, characterized in that the peripheral units (2) with the bus (3) in the form of a ribbon cable are connected via attached connectors (11). 11. Bus, dadurch gekennzeichnet, daß im Bus (3) ein Analogteil (6) und ein Adreß- und Datenteil (4, 5) vorgesehen sind und daß im Analogteil (6) Analogsignale übertragen werden, nachdem im Adreß- und Datenteil (4, 5) die Digitalsignale einen definierten Spannungszustand eingenommen haben, der während der Analogübertragung unverändert aufrecherhalten wird.11. Bus, characterized in that an analog part (6) and an address and data part (4, 5) are provided in the bus (3) and that analog signals are transmitted in the analog part (6) after in the address and data part (4th , 5) the digital signals have assumed a defined voltage state, which is maintained unchanged during the analog transmission.
EP89119106A 1988-11-21 1989-10-14 Decentralised control unit, particularly for a rotary printing press, linked by a bus to a plurality of peripheral units Expired - Lifetime EP0370223B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89119106T ATE100761T1 (en) 1988-11-21 1989-10-14 DECENTRALIZED CONTROL COMPUTER, ESPECIALLY WITHIN A ROTARY PRESS, CONNECTED VIA A BUS WITH SEVERAL PERIPHERAL UNITS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3839248 1988-11-21
DE3839248A DE3839248A1 (en) 1988-11-21 1988-11-21 DECENTRALIZED CONTROL CALCULATOR, IN PARTICULAR WITHIN A ROTATIONAL PRINTING MACHINE CONNECTED TO MULTIPLE PERIPHERAL UNITS BY A BUS

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EP0370223A2 true EP0370223A2 (en) 1990-05-30
EP0370223A3 EP0370223A3 (en) 1991-03-27
EP0370223B1 EP0370223B1 (en) 1994-01-26

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US (1) US5101474A (en)
EP (1) EP0370223B1 (en)
JP (1) JPH0772841B2 (en)
AT (1) ATE100761T1 (en)
DE (2) DE3839248A1 (en)
ES (1) ES2048809T3 (en)

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Also Published As

Publication number Publication date
EP0370223A3 (en) 1991-03-27
JPH02188802A (en) 1990-07-24
ES2048809T3 (en) 1994-04-01
EP0370223B1 (en) 1994-01-26
DE3839248C2 (en) 1992-12-10
DE3839248A1 (en) 1990-05-23
DE58906821D1 (en) 1994-03-10
JPH0772841B2 (en) 1995-08-02
ATE100761T1 (en) 1994-02-15
US5101474A (en) 1992-03-31

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