S Automation System Module Data Manual 02/ A5E This description forms part of the documentation package with the order number: . Die vorliegende Produktinformation beschreibt Korrekturen zum Gerätehandbuch Automatisierungssystem S Baugruppendaten, Ausgabe 03/ Sm Ai 8 X 12 Bit Getting Started Part 3 Pdf, Read Online S7 Sm Ai 8 X 12 . automatisierungssystem s baugruppendaten gerã¤tehandbuch.
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The invention relates to a digital input unit for an automation device having at least one current-drawing DC input bagruppendaten for connecting a transducer operated at a nominal DC voltage, where the input channel is configured to set the current based on the input voltage according to an input characteristic curve. A transducer can be connected to one of the input channels, for example, a transducer in the form of a Bero proximity switch which is designed for a nominal DC voltage of 24 or 48 V, an input characteristic curve complying with a so-called type 1 or type 2 characteristic according to the IEC or EN standard.
Titel der Druckschrift Anwender Hersteller / Service (SINUMERIK) |
This standard prescribes current and voltage limits for 0 and 1 signal states for the type 1 and baugruppendwten 2 characteristics, the current limits according to the type 2 characteristic being higher than those predefined according to the type 1 characteristic. According to the type 1 characteristic, the upper current limit for a 0 or 1 signal state is 15 mA, but is 30 mA according to the type 2 characteristic.
The situation may baugurppendaten occur in which, on account of a customer requirement, a digital input unit must perform functions for a multiplicity of transducers of different nominal DC voltages. In this case, the digital input unit must be designed for a multiplicity of DC input voltages, for example in a range from 24 V to V.
It is 3000 an object of the invention to provide a digital input unit which is suitable for connecting transducers of different supply voltages and which is baugruppedaten with a reduced power loss.
This and other objects and advantages are achieved by virtue of the fact that an input channel of the digital input unit is configured to limit the input current to a first value up to a changeover voltage, where the changeover voltage is greater than or equal to a voltage limit up to which a 1 signal state is represented, and is configured to limit the input current to a second value lower than the first 30 above this changeover voltage.
In accordance with the invention, the input characteristic curve is set, which represents the dependence of the current on the input voltage, based on the input voltage.
As a result, the input characteristic curve is optimized such that, on the one hand, the advantages of the type 2 characteristic are achieved in the case of small input voltages up to a changeover voltage limit or a changeover voltage baugruppenddaten, on the other hand, the disadvantages of this type 2 characteristic with respect to the power loss are avoided in the case of large input baugruppndaten above this changeover voltage baugrupppendaten.
In this case, in order to avoid this disadvantage, the input current is reduced to the input current according to the type 1 characteristic in the case of large input voltages above the changeover voltage limit.
One embodiment of the invention provides simple circuitry measures which are used to set the constant current to the first or second value. Other objects and features of the present invention will become apparent from the following detailed description considered in conjunction with the accompanying drawings.
It is baguruppendaten be understood, however, that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the invention, for which reference should be made to the appended claims.
It should be further understood that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described herein. The invention, its refinements and advantages are explained in more detail below using the drawing which illustrates an exemplary embodiment of the bauguppendaten and in which:. Up to an input voltage limit of 30 V, which represents the upper limit of the V nominal range, the digital input unit has a type 2 behavior according to the IEC or EN standard.
An input voltage range of 5 V to 11 V defines the transition region which describes neither a 0 nor a 1 state, where the input channel is able to draw a current of 2 mA to 30 mA in this transition region.
At low input voltages U up to a voltage U Sthe input channel has a resistive behavior and is also configured to limit the input current I to a first value I Typ2 below U Sthe changeover voltage U S being greater than or equal to the voltage limit of 30 V, up to which the 1 signal state is represented. This first value I Typ2 is 6 mA to 30 mA which is drawn by the input channel during the 1 state.
The input channel is also configured to limit the input current I to a second value I Typ1 lower than the first value I Typ2 above this changeover voltage U S. This second value I Typ1 is selected such that this value is in the range of 2 mA to 15 mA at the input voltage representing the 1 state according to the type 1 characteristic curve.
Reference is made below to FIG. The input circuitry 4 comprises a current sink 5 and switching device 6 which switch the current sink 5 to a first operating mode and a second operating mode based on the input voltage at terminals E, M of the input circuitry 4.
It is assumed that the proximity switch 3 is intended to detect the position of a workpiece and changes its resistance based on the position of the workpiece, which is indicated in the drawing using a resistor 7 and a switch 8. This change in resistance influences an input voltage U EM at terminals E, M of the input circuitry 4which is applied to a threshold evaluation unit 9 for determining a 0 or 1 signal state.
In a second operating mode in which the input voltage U EM exceeds the changeover voltage U S formed by the resistors R 3R 4the transistor V turns on and the current I is determined by the diodes V 1V 2 and the resistor R 1. In this case, the current I is set to the second value I Typ1 which is lower than the first value I Typ2.
Within the scope of the present consideration, the diode V 1 can be disregarded because the voltage drop and the voltage drop across the base-emitter diode of a transistor V are compensated for, which transistor is connected in series with the resistor R 1. A digital input unit for an automation device, having at least one current I -drawing DC input channel for connecting a transducer 3 operated at a nominal DC voltage, the input channel being configured to set the current I based on the input voltage U EM according to an input characteristic curve, is distinguished by the fact that the input channel is also configured to limit the input current I to a first value I Typ2 up to a changeover voltage U Sthe changeover voltage U S being greater than or equal to a voltage limit up to which a 1 signal state is represented, and to limit the input current I to a second value I Typ1 lower than the first value I Typ2 above this changeover voltage U S.
Such a digital unit is suitable for connecting transducers of different supply voltages and can be operated with a reduced power loss.
6ES7 398-8FA10-8EA0 (6ES73988FA108EA0) SIEMENS HANDBUCHAUFBAU
Thus, while there have shown, described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention.
It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.
Year of fee payment: A digital input unit for an automation device includes at least one current drawing DC input channel for connecting a transducer operated at a nominal DC voltage, where the input channel is configured to set the current based on an input voltage UEM according to an input characteristic curve. Measures are proposed, as a result of which the digital input unit is suitable for connecting transducers of different supply voltages, abugruppendaten the digital input unit is operable with a reduced power loss.
Field of the Invention The invention relates to a digital input unit for an automation device having at least one current-drawing DC input channel for connecting a transducer operated at a nominal DC voltage, where the input channel is configured to set the current based on the input voltage according to an input characteristic curve.
The invention can thus be summarized as follows: What is claimed is: A digital input unit for an automation device, comprising: The digital input unit as claimed in claim 1wherein the input channel includes: EP EPA1 en Power amplifier for high-frequency IC has multiple sections of stages vertically connected and the polarization circuits control individually the multiple base voltages applied to the bases of bipolar baugrippendaten of the second stage.
Semiconductor integrated circuit bahgruppendaten having overheat protection circuit and overheat protection method. Apparatus, system and method for high resolution identification with temperature dependent resistive device. Method for determining a switch-on threshold and electronic circuit arrangement for carrying out the method.
Circuit arrangement for voltage selection, and method for operating a circuit arrangement for voltage selection. M Year of fee payment: