JPH0287205A - Controller for switching device - Google Patents

Abstract

PURPOSE:To prevent a circuit which is connected through a switch from being damaged, etc., by designating an address from a CPU to a storing means, in which a control code to correspond to the respective opening and closing conditions of the plural switching devices outputted the control code to the switching device and executing opening and closing control according to the control code. CONSTITUTION:The control code to four relays 7-10 is stored to prescribed addresses (OC-11) in a ROM circuit 20 in advance and the control code, for which the address is designated, is outputted from a CPU14 to the respective relays. For example, when the address 00 is designated from the CPU14, a control code '0001' is read and the relay 7 is turned on. Thus, when the address is designated from the CPU14 to the ROM circuit 20, the control code to corre sponding to the address is outputted from the ROM circuit 20 to plural switching devices 7. Since the opening and closing control of the switching device 7 is executed in correspondence to the control code, the damage accident of a con nected signal source or an object to be tested is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Application Field of the Present Invention The present invention relates to a switching device control device for controlling the opening and closing of a switching device such as a relay or an analog switch.

<Prior art> (Fig. 6) For example, in an integrated circuit testing device, various signals are input to the input terminal of the DUT by switching, and the output response is measured on the receiver side. 2. Description of the Related Art Tests of objects are performed, and in many cases, such devices automatically control switching of input signals to the object under test using a preset control program.

FIG. 6 is a block diagram showing the configuration of a test device equipped with a conventional control device that performs such switching control.

In the figure, 2 indicates different signal sources 3 to 3 for the device under test 1.
6 is a signal source switching unit that switches and inputs each signal source 3 to 6.
The output of is connected to the input terminal of the device under test 1 via relays 7 to 10.

Reference numeral 11 denotes a receiving section that receives the output of the device under test 1 and measures the output response to each signal source.

Reference numeral 12 denotes a control device that controls the opening and closing of the relays 7 to 10 based on a preset control program, and is composed of a memory 13 in which the control program is stored and a CPU 14, and is configured to store control codes for the four relays 7 to 10. is C
It is output from the pass lines 81 to B4 of the PU 14.

15-78 are drivers that drive the relays 7-10 in response to control codes.

Therefore, for example, when a control code of "'0010" is output from the pass lines 81 to B4 of CPU i4,
Relay 8 is turned on via driver 16.

The output of the signal source 5 is then supplied to the device under test 1, and a test is performed based on the output response.

Problems to be Solved by the Present Invention> However, as described above, in the control 11 device that directly opens and closes the relays 7 to 10 via the pass line of the CPLJ 14, runaway of the CPU 14 and program errors (bugs) occur. In this case, the control codes for relays 7 to 10 become unstable, different signal sources are connected to each other, or an input that exceeds the standard is applied to the device under test 1, resulting in damage to the signal source or the device under test 11. There was a problem with accidents.

Furthermore, since the pass line is occupied by the number of relays, there is a problem in that the number of relays that can be opened and closed or other controls by the CPU 14 (for example, all controls on the receiving section 11) are limited.

In addition, when the control code is directly output from the CPU 14 as described above, it is necessary to perform arithmetic processing on the switching data in the control 10 grams and convert it into a control code, and then output it to a switching device such as a relay. When data and control codes have an irregular relationship, the ap processing cannot be performed by the same program, resulting in a problem that the control program becomes extremely complicated.

An object of the present invention is to provide a switching device control device that solves these problems.

Means for Solving the Problems> In order to solve the problems described above, the switching device control device of the present invention stores control codes corresponding to each open/closed state of a plurality of switching devices in advance at a predetermined address. and has storage means for outputting control codes of addresses designated by the CPLI to a plurality of switches.

Therefore, when an address is designated from the CPU to the storage means, a control code corresponding to that address is output from the storage means to a plurality of switch devices, and the switch switches are opened/closed in response to this control code. Control is exercised.

Examples of the present invention> (Figures 1 to 3) Hereinafter, one embodiment of the present invention will be described based on the drawings.

Figure 1 shows the above (Figure 6) trial! Liii! This is a circuit diagram illustrating the control of the cutter used in the apparatus, and the memory 113 for storing the measurement program, the CPL 114, and the drivers 15 to 18 are the same as in FIG. 6, and their explanation will be omitted.

20, the control codes for the four relays 7 to 10 are stored in advance at a predetermined address (00
11) and is a ROM circuit serving as a storage means for outputting control codes addressed by the CPU 14 to each relay.

Therefore, for example, if the address OO is designated by the CPU 14, the control code ``0001'' will be read out and the relay 7 will be turned on.

FIG. 3 is a flowchart when measuring by switching four relays 7 to 10 in order! . After the numerical value A is initialized to 0 in step 1, the address A for the ROM circuit 20 is output from the CPL 114 in step 2.

As a result, the response of the device under test 1 with the relay 7 ONL and the signal source 3 as an input is measured (step 3).

In step 4, A is increased by 1, and in step 5 it is determined whether the value of A is equal to 5.

The processing from step 2 to step 5 is repeated until the value of A becomes 5, and tests using signal sources 4 to 6 as inputs are sequentially performed.

In addition, at addresses (11) 2 and above of the ROM circuit 20,
Since the code “0000” is stored, CPtJ
If (11) 2 or more addresses are specified due to runaway of B14, all relays 7 to 10 will be open, and the DUT 1 will be released from all signals B3 to B6, resulting in damage, etc. No accidents will occur.

Other Embodiments of the Present Invention (Figures 4 and 5) In the above embodiments, the case where four relays are switched has been described, but this does not limit the present invention, and it is possible to switch a larger number of relays. This can be done with almost the same configuration.

Further, in the embodiment described above, a driver was provided for driving the relay, but an analog switch may be used as the changeover device and the driver may be omitted.

Further, in the embodiment described above, the case where four relays are turned on as ffi is explained, but a control '11 code that turns on two or more switchers at the same time may be used.

For example, as shown in FIG. 4, 5 dB, 10 dB.

The attenuation of the attenuator 30, which is constructed by connecting five attenuation elements 31 to 35 in series, each having an attenuation of 20 dB, 30 dB, and 40 dB, is controlled arbitrarily in 5 dB steps between 0 and 105 dB to be tested. When the level of the input signal to an object is arbitrarily changed, each attenuation element 31
If the control codes (C1 to C5) for the changeover switches 41 to 45 connected in parallel to the switches 41 to 35 are stored in advance at the address corresponding to the attenuation data as shown in FIG. 5, any attenuation data can be set. Corresponding control codes are output to each of the changeover switches 41 to 45 to control switching of the attenuation amount.

In this case, by making the address code a value obtained by evolving the attenuation data into 16, it is possible to provide regularity between the attenuation data and the address, and it is extremely easy to specify the address for the ROM (i.e., the control program). become.

In addition, in the memory diagram of FIG. 5, (0) Io ~ (105
) For addresses other than +o, " o o o
.

O" control code is stored, and the maximum attenuation amount is given to the attenuator 30. Even if there is a bug in the supply program or the CPU 14 runs out of control, an excessive level will not be applied to the test object. It is possible to prevent signal input.

Effects of the present invention> As described above, the switch control i11 device of the present invention has the following effects:
The CPU sends the control code corresponding to each open/close state of the plurality of switching devices to the storage means stored in advance at a predetermined address.
Since the address is specified from the storage means and the opening/closing is performed by the control code output from the storage means to the switch, there are no bugs in the control program or CP.
Even if an address other than the predetermined address is specified due to LI runaway, etc., an abnormal control code will not be output from the storage means, and accidents such as damage to the circuit connected via the switch will be prevented. Can be done.

Furthermore, the opening/closing control of a large number of switches can be performed with a small number of address lines from the CPLI, and the control range of the CPtJ is not limited.

Furthermore, even when outputting control codes that do not have a regular relationship with the switching data of the control program, by setting regular address values for this switching data, irregular control codes can be output to the switching device. Since it can be output, the control program can be simplified.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a memory diagram showing storage contents of main parts of the embodiment, and FIG. 3 is a flowchart showing processing operations of the embodiment. . FIG. 4 is a block diagram for explaining another embodiment of the present invention, and FIG. 5 is a memory diagram showing the stored contents of essential parts of the circuit of FIG. 4. FIG. 6 is a block diagram showing a test device using a conventional device. 1...Device under test, 2...-Signal source switching unit, 3-6...Signal source, 7-10...Relay 11... ...Receiving unit, 12-...Control device, 13...Memory device, 14...C
PtJ, 15-18... Driver, 20...
...ROM circuit. Figure 1 Figure 3 Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] A plurality of switchers (7 to 10, 41 to 4) provided between circuits
5), in which a control code corresponding to each open/close state of the plurality of switches (7 to 10, 41 to 45) is stored in a predetermined address in advance. and a storage means (20) for outputting a control code of an address designated by the CPU (14) to the plurality of switchers (7-10, 41-45), the storage means (20)
The plurality of switching devices (7
~10, 41~45) A control device for a switch, characterized in that it opens and closes.