SU1434375A1 - Device for monitoring contact-making - Google Patents

Abstract

The invention relates to a control and measuring technique and can be used to control digital equipment nodes. The aim of the invention is to increase the reliability of control by detecting failures in the contact node by indicating the overall contact result and the contact result of individual channels. The device dp of control of logic blocks contains a test generator, a contact node, a power source, a four-position switch, two sets of threshold elements, an electrical isolation unit, an OR element, and two indication elements, which makes it possible to improve the quality of control of the UZL9V radioelectronic equipment. 3 il. €

Description

The invention relates to the control of the HC-measuring technique and can be used for the control operations of the nodes of digital equipment.

The aim of the invention is to increase the reliability of the control.

FIG. 1 is a block diagram of a contacting device; FIG. 2 is a diagram of a contact node; Q in FIG. 3 is a schematic of a four-position switch,

 The device (FIG. 1) contains the test generator 1, the contact node 2, the power supply 3, the four-position switch 4, the first block of threshold elements formed by resistors 5.1–5, n and diodes 6.1–6. galvanic isolation unit, formed by optocouplers 7.1-7, p, second 20 block of threshold elements, formed by diodes 8.1-8 "n and resistors 9.1-9, n, display element 10, element OR 11, element 12 indications.

The contact node (FIG. 2) of the device 25 contains n contact groups, each contact group having two inputs and one output. As the contacting device connecting the inputs of the contact group, it is used self-. This is the output of the controlled product.

The device operates as follows

. In the initial state, switch 4 is turned off. On the first and second outputs there is no potential, on the third - -, on the fourth - -. As a result, the tested block is de-energized, blocks 5–9 are connected in such a way that the current passes through resistors 5, i and diodes, In those channels where the contact groups of the contact node are closed, toK passes through the circuit: resistor 5.1 is diode 6.1 - a closed terminal contact 2.1 - a resistor 9.1., and the output of the optocoupler 7.1 is not excited; the indlcators corresponding to these channels in element 10 are not turned on. In the same channels where the contact groups eg of the contacting node are not closed, the current passes through the circuit: resistor 5.1 - diode 6.1 - input circuit of the optocoupler 7.1 - diode 8.1 - resistor .9.1, the outputs of the optrons are excited, and the corresponding indicators , in element 10 is included, indicating channels with no contact. If there is one such channel, then the element OR 31

35

Q

0

five -.

0 5 g

five

generates a signal 1, which is indicated on the element 12, signaling the presence of a failure in the contact system.

If there are no channels with contact defects, the indicators in the element 10 are not turned on, the output of the element OR 11 is 0, and the element 12 is also not turned on, which is a permission to switch to logical testing of the controlled product, which is done by setting the switch 4 to the on state . In this case, the supply voltage is applied to the tested product through a contacting device.

Claims (1)

Invention Formula A contact monitoring device comprising a test generator, a contact node, a power source, a four-position switch, the test generator group of the test generator is connected to the first group of inputs of the contact unit, the second group of inputs of which is the group of device inputs for: the outputs of the contacting logic unit, the positive and negative poles of the power source are connected to the first and second fixed contacts of the four-position switch, the first The moving contact terminal is the first and second outputs of the device for connecting to the first and second power inputs of the controlled logic unit, characterized in that, in order to increase the reliability of the control, the first and second blocks of threshold elements are inserted into it, two display elements and an OR element, the first output of the second pair of moving contacts of the four-position switch is connected to the input group of the first block of threshold elements, the second output of the second pair of moving contacts acts of four-position switch soy, 1inen with a group of inputs of the second block of threshold elements, a group of outputs of which and a group of outputs of the first block of threshold elements are connected to the first and second groups of inputs of the block respectively, the group of outputs of the second block of threshold elements is connected to the third group of inputs of the contact device, the group of outputs of the block ment indication. galvanic isolation is connected to the inputs of the first display element and the inputs of the OR element, the output of which is connected to the input of the second ele + 9g.1 fS ((/8.2 Fig.Z