DE2947502C2 - Circuit arrangement for the logical connection of functional groups - Google Patents

Description

nem two-stage switch 11, which is controlled via a controllable logic 21 from the signal output L of the upstream function group, can be switched via a subsequent series resistor 12 to the output of the circuit arrangement integrated with the function group. The positive supply voltage represents the logical 1, the negative supply voltage the logical 0 and no supply voltage or connection with reference potential, measured at switch output 11, the off state or a failure.

The threshold for the input signal of the following When dividing the total stroke between positive and negative supply voltage, level is in 12/12 at 7/12. As shown in FIG. 2 is the area for the logical 1 between 8/12 and 12/12, that for the logical 0 between 0 and 6/12. The signal-to-noise ratio is

I ± 1/12.

■ § F i g. 3 shows the logical connection of three function groups 1,2,3. in which the two-stage teaser 11

II of the schematic circuit diagram from FIG. 1 of φ sammengeschalteten transistors 'to-two' best 14,15 ', whose Tb is common base connected to the output of an amplifier 13 Operationsg The output of each'% a function group associated Schaltungsanordil voltage is of two interconnected electric;! F to the parallel-connected transistors 14, 15 and the downstream S series resistor 12 is formed; t the other two electrodes of transistors 14 and ⁱ 15 are each connected to the balanced supply voltage%. L is again the signal output % of the upstream function group. From Fig. 3 i | furthermore the integration of the scarf according to the invention: ;; (The arrangement of the individual function groups 1, 2,;. 3 can be seen. The function groups '■' [. are linked externally by direct wiring.

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Claims (2)

■. .. Majority of the output signals of a selected unpatent claims: even number of input signal circuits is determined. All these known circuit arrangements for logi- 1. Circuit arrangement for logical linking- see linking of functional groups are considered of functional groups, thus identifying 5 separate devices with their own power supply, that two leads to a reference potential. Another disadvantage is that in the case of a functionally symmetrical Supply voltages two-pole mode 1 of 3 (cold double redundancy) the major can be switched off must be designed to be controllable by a two-stage switch (11). leads are from the signal output (L) of a radio The invention is based on the object of a tion group via a controllable logic circuit ι ο circuit arrangement for the logical combination of tang controlled is that the common pole of the two - maximum three function groups to be specified, which in simple level switch (11) can be integrated into the function groups via a subsequent se- rather way series resistor (12) is led to an output, can and does not require any external switching elements, and that several such, each separate radio- This object is achieved according to the invention, tion group (1,2,3) assigned outputs immediately that two connections symmetrical to a reference potential are wired to each other. Two-pole supply voltages can be switched off to one 2. Circuit arrangement according to claim 1, two-stage switches are guided by the signal output characterized that the two-stage switch gear of a function group over one of them sieuerba- (11) from two of an operational amplifier (13) re logic circuit is controlled that the common controlled * interconnected transistors 20 pole of the two-stage switch via a subsequent (14, 15), the common basis of which is led to an output with the series resistor, and Output of the operational amplifier (13) connected that several such, each separate function group is, that the series resistor (12) two outputs associated with each other pen directly to each other connected electrodes are wired together. th transistors (14, 15) is connected downstream and the 25 An advantageous development of the invention is off ren both still free electrodes with the positive one can be found in dependent claim z'i, or negative supply voltage connected The advantages achieved with the invention consist mainly are. special in the fact that any number of functional groups without additional external switching elements 30 can be connected to each other, each a maximum of three function groups can be in operation. With three function groups the following Bc- The invention relates to a circuit arrangement for operating modes:
logical connection of function jgroups. Such circuit arrangements are self-3s a) 1 out of 3 - operation, Permanent devices running on whose inputs the same b) 2 out of 3 - operation (function and plausibility). or different functional groups are connected, c) majority
and at their outputs a logical link corresponding signal for further processing for the The reliability of the link is not fortune stands. 40 reduced by an additional external control. For example, a circuit arrangement for but solely through the EI N / AUS supply / .u- Determine the majority of three known signals that stood predetermined; i.e. when a device is switched on made up of three AND gates, each of which is two inputs: 1 out of 3 - operation when two devices are switched on and an OR gate, which are three inputs: AND operation (from two devices), if three has gears. This circuit arrangement indicates that 45 devices are switched on: majority operation. A toilet rem output emits an output signal »1« if a significant advantage of the sound system according to the invention Output signals are present at two or three of the inputs, the arrangement is that a device is switched off and an output signal »0«, if an input signal regardless of its possible failure (short is only present at one of the inputs. Conclusion or interruption) has no influence on others From DE-OS 26 59 199 a logical majority of 50 function groups is exercised. Another benefit is there decision circuit known that only with a relative in the free selection of the linking methods. So tively small number of MOS transistors can be formed depending on the respective task and can be produced as an integrated circuit. This order one to three devices connected together and Known circuit arrangement contains an odd so that different operating states are possible Number of input signal base circles that become 55 in parallel. a voltage source are connected, each one being one. Two exemplary embodiments of the invention are shown in FIG output signal base circle from a pair of P and N-Ka drawings and are shown in more detail below nal MOS transistors. The drain connections of the described. It shows MOS transistors are connected to one another, and Fig. 1 is a basic circuit diagram, form the output terminal at their connection point. 2 a schematic representation of the signal chit = Enough. The gate connections are also linked to one another at the output of the linked functional connected to group at the common connection point, to create an input connection. The output connection is a logical combination of three radio links of the logical majority decision circuit tion groups according to the invention,
results from the combination of all output connections. 65 In FIG. In addition, the well-known majority decision circuit has two Vcrsore, which are symmetrical with respect to a reference potential, and a series of further logic circuits, whereby the supply voltages, which can be switched off in two poles and with one