SU928335A1 - Device for switching off external devices from the communication line that connects external devices to computer - Google Patents

Description

(54) DEVICE FOR DISABLING EXTERNAL

DEVICES FROM COMMUNICATION LINES CONNECTING

one

 The invention relates to computing technology and can be used to automatically turn off external devices when faults are detected in an input / output interface or in external devices.

A device for communicating external devices with a digital computer is known, comprising a control unit, memory elements, a circuit, modulo two convolutions, a counter and an IJ error recognition unit.

The drawback of the device is that it is also capable of notifying the digital computer about the occurrence of errors, but does not allow promptly disconnecting the device from the digital computer.

It is also known to disconnect a communication device in the event of a malfunction, which contains external devices connected to the communication line and a monitoring device that has transmit and receive circuits 12}

However, this device disconnects all external devices from the communication lines regardless of the fact that

The location of the communication line has experienced a malfunction, despite the fact that in this case normal exchange with a part of external devices connected to the communication line to the location of the communication malfunction is possible. The device does not allow also to disconnect the faulty external devices that prevent normal exchange with other serviceable external devices.

ten

A device for automatically disconnecting computing devices from a faulty communication line is known, which contains a fault detector of the communication line, a control unit for disconnecting the device and a unit for disconnecting an external SOC device.

However, this device does not automatically disable an external external device that is not working properly: when this faulty external device generates logical interference in the external device. common communication lines, which leads to the impossible exchange operations between the computer I / O channel and external devices connected to the common communication lines. Not provided; Also, automatic disconnection of a faulty external device, which is valuable to common communication pins in cases when this faulty external device does not expose logical interference to the common communication linguistic network, but prevents the establishment of communication between the input channel - computer outputs and other operable external devices (for example, a faulty external device does not pass a control signal - a sample, in relation to which all external devices connected to the input-output channel of the computer are connected in series). These drawbacks limit the functionality of the device. The purpose of the invention is to expand the functionality by organizing additional shutdown modes in case of external device failures and / or errors in the operation of external devices. I The goal is achieved by the fact that B is a device for disconnecting external devices from communication lines connecting external devices to a digital computer containing a fault detector of communication lines, the inputs of which are connected to communication lines, and a switch whose outputs are connected to line In this connection, four AND elements are introduced; two - OR elements, three NOT elements and a delay element, the output of the fault detector of the communication lines connected to the master output of the device and the first input of the first element I, the second input of which is connected to the installed device input, the output of the first element I connected to the first input cm of the first the OR element, the second input of which is connected to the output of the second element AND, the first input of which is connected to the output of the delay element, the input of which is connected to polling No. 1m of the device and the second input of the second element AND, the third input to of which is connected to the output of the first element NOT, the input of which is connected to the translational input of the device, the indicative input of the device is connected via the second element NOT to the fourth input of the second element AND, the fifth INPUT of which is connected to the first input of the third element AND and to the third element NOT, the input of which is connected to the mode input of the device and from the first. vym INPUT of the fourth element AND, the second input of which is connected to the device's request input, the first group of information inputs of the device is connected to the first group of information inputs of the switch AND through the second OR element to the second input of the third AND element whose output is connected to the third input of the first OR element, fourth the input of which is connected to Brf by the course of the fourth element I, the second group of information inputs of the device is connected to the second group of information inputs of the switch, the control input of which is Gross carrying one with the output, the first OR element. FIG. 1 shows a block diagram of the device; in fig. 2 is one of the embodiments of the structural scheme of the fault detector of communication lines. The device for shutting down the external devices (Fig. 1) contains the detector 1 line failure, KcaviMyTaTop 2, the first element AND 3, the first element OR 4, the second element AND 5, the delay element 6, the first element NOT 7, the fourth element And 8, the second element is NOT 9, the third element is AND 1O, the third element is NOT 11, the second element is OR 12, the communication line 13, which specifies the output 14, the setup input 15, the interrogation input 16, the translational input 17, indicative input 18, and the interrogation input 19, mode input 20, first 21 and second 22 groups of information inputs. The detector of communication line malfunction (Fig. 2) can be performed in the form of receivers 23, deshi4 ator-24, element AND-NE 25i of element AND 26. Switch 2 represents a group of electromechanical relays or a group of electronic switches. In addition, it provides the disconnection of the external device from the communication lines 13 and closes the bypass path for the control signal Sample. Device output 14 is connected to device input 15, which is part of an external device that has a higher service priority, since all external devices are connected to the computer I / O channel via common communication lines, they are connected in parallel to KOTOpbiM, and on the Sampling line, all external devices are connected to the input-output channel of the computer sequentially along the chain, starting with an external device having the highest priority in service and ending with an external device having a lower priority in service. A control signal is sent to the device input 16 A sample, a control signal is fed to the device's input 17, a back sampling signal is sent to the device 18, a subscriber control signal is sent to the device 18, a control signal is supplied to the device input 19, a subscriber signal is sent to the device 20 input The work of the subscriber. The information inputs 21 of the device receive subscriber signals (i.e., an external device), the output of which to the general communication lines 13 is accompanied by a control signal. The work of the subscriber arriving at the input 20 of the device. The information inputs 22 of the device receive subscriber signals, the output of which to the common communication lines 13 is not caused by the presence of control signals. The device works as follows. With an operable common links 13 and a workable external device, all signals arriving at information inputs 21 and 22 of the device through the switch 2 are output to the common links 13. When the common links fail, the intercom devices start to disconnect from the common links 13 consecutively along the chain, starting with an external device having the Shzschy priority (i.e. an external device connected last on the Sample line). Thus, when the malfunction detector of the communication lines 1 of the rt-th external device having the lowest priority determines the malfunction of the common communication lines 13, then logical 1 will appear at the output of the malfunction detector of the communication lines 1 the first input of the element is 3. At the second input of the element 3, logical 1 is always present (since the p -th external device is connected last on the Sample line). As a result of logical multiplication at the output of the AND 3 element, logical 1 appears, which through the OR 4 element affects the control input of the switch 2, as a result of which the switch 2 disconnects the external device from the faulty communication link 13. From output 14 the disconnecting device included in the vi -th external & device, a logical 1 is output, which is fed to the input 15 of the disconnecting device included in (n -1) an external device that has a higher priority (because it is .56 next to last on line Selection ka), and if the fault detector of the communication lines of the 1 (n -1) -th external device also determines the fault of the communication lines 13, i.e. on. its output by Wits logical 1, then (n -1) the external device is disconnected from the common communication lines 13 in the same way as described, and from the output i4 of the disconnecting device entering corresponding (n -1) -th external device to the input 15 of the device the disconnection included in the (n-2) -th external device receives a permission signal to oi turn off from the common communication lines 13 (n-2) of the external device. Thus, external devices of digital computers, starting with, having the lowest priority. disconnecting from the faulty common communication lines 13 one after another along the chain to that external device, the fault detector of communication 1 of which does not detect the malfunction of the communication lines 13, i.e., its output will remain the logical 0 level, which means the prohibition on disconnecting this external device from the common communication lines 13, and this external device remains with the connected "common personal communication link 13. Thus, the external devices connected to the common communication line 13 in the DT section of the input channel connection point computer output to the place nei Common lines of communication 13 continue the normal exchange with the computer I / O channel, and those external devices that are connected along the chain along the Sample line are disconnected from the common lines 13 where the common line 13 fails. In the case when a control signal is received at the input of an external device, it also goes to input 16 of the disconnecting device and if none of the signals of the Inverse Sampling, Subscriber Management or Subscriber's signals that come As well, the inputs are 17, 18, and 20, respectively, as a result of logical multiplication at the output of the AND 5 / element, logical 1, which through the OR 4 element enters the control input of the switch 2, which turns off. a faulty external device from common communication lines 13. In the case where an external device is logically connected to a common "..." line. But does not remove the signal

maintenance, it must be disconnected from the common communication lines 13,

In this signal, the subscriber's requirement and the subscriber's operation from the outputs of the external device arrive at inputs 19 and 20 of the device, respectively, disconnected. As a result of logical multiplication, the output of the AND 8 element appears logical 1, which through the OR 4 element enters the control input of the switch. 2, which disconnects the faulty external device from the common communication lines 13.

The information inputs 21 of the disconnect device receive the user signals from the external device outputs, the output of which to the common communication lines, must be accompanied by the presence of a control signal. The subscriber operates at the output of the external device which enters input 2O of the disconnect device. If, in the absence of a control signal, the subscriber’s operation any of the signals arriving at the information inputs 21 of the disconnecting device is present at the output of the external device, then logical logical multiplication at the output of the AND 10 element appears logical 1, which through the OR 4 element enters the the control input of the cocklet switch 2, which disconnects the faulty external device from the common communication lines 13.

 Thus, the invention makes it possible to increase the reliability of work, since it eliminates faulty external devices, obstacles to the skinny exchange between the I / O channel of the computer and other devices iicnpafeHbiNOT external devices. In addition, the invention implements the automatic disconnection of external devices from faulty common communication lines, and only those external devices, the normal exchange of which with the computer I / O channel is impossible.

Claims (3)

1. USSR Author's Certificate No. 359645, cl. G06F 3/04, 1971. 2. For Japan No. 53-24255, . Q About F 11 / OO, (506F 3/00, 1978. 3. For Japan No. 54-15385, cl. Q 06 F 3/04, G O6F 11 / OO, 1979 (prototype).