JP2508305B2 - Initial value determination device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an initial value determination device that determines initial values when various control circuits once stop operating and then restart.

[Conventional technology]

In general, a device having a high function tends to be complicated as the device becomes physically large and difficult to maintain. In such a device, it is general to divide the device into a plurality of functional units for the convenience of transportation and transportation, and for easy maintenance. That is, a device having a desired function is obtained by combining a plurality of plug-in units each having a circuit that can be removed for each predetermined function.

FIG. 4 shows an apparatus configured with a plug-in unit for a predetermined function.

For example, in the case of performing communication, there are cases in which a plurality of packages each including a circuit for performing a predetermined process are arranged in order to ensure a high degree of reliability, and these processes are performed in parallel.
In such a case, a signal processed by one of the packages is usually used, and when an abnormality occurs in the package, the signal of another package is immediately switched to maintain communication. The conventional plug-in unit used in such a case will be described below.

The same signal 13, for example an audio signal, is supplied to the first package 11 and the second package 12. From the first and second packages 11 and 12, a signal obtained by performing the same processing on the signal 13.
16, 17, for example, PCM (Pulse Code Modulation) signals are output. Further, these packages 11 and 12 are designed to perform self-monitoring regarding the processing of the signal 13, and also output monitoring signals 18 and 19 indicating the monitoring result. Signal 16 and signal 1
7, and the monitoring signal 18 and the monitoring signal 19 are the same if the first and second packages 11 and 12 are normal.

The signals 16 and 17 are supplied to the controlled circuit 22 of the second plug-in unit 21. The controlled circuit 22 includes a selector circuit (not shown), and uniquely selects one of the signals 16 and 17 according to the control signal supplied from the control circuit 24 of the first plug-in unit 23. And output. First
The control circuit 24 of the plug-in unit 23 of the
In response to the supply of 19, the predetermined control signal is output from the terminals 27 and 28.

FIG. 5 shows the correspondence between the control signal output from the control circuit 24 upon receiving the monitoring signals 18 and 19 and the operation performed by the controlled circuit 22 based on this control signal.

The control circuit 24 uses four different control signals “00”, “01”,
Generates and outputs "10" and "11". On the other hand, the controlled circuit 22
Performs operation A, operation B, operation C, and operation D in response to these control signals. For example, when both monitoring signals 18 and 19 are normal, the control circuit 23 outputs the control signal "00". In this case, the controlled circuit 22 can select either of the signals 16 and 17, but in order to uniquely determine the operation of the control circuit 24 at the time of startup, the first package 11 is selected as the operation A. Select the signal 16 provided by. When either one of the control signals 18 and 19 is an abnormal signal, the control circuit 24 outputs the control signal "01" or the control signal "10", and the controlled circuit 22 outputs the signals 16, 17 as the operations B and C. Out of which a normal signal is output. Further, when the control signals 18 and 19 are both abnormal signals, the control circuit 24 outputs the control signal "11", and the controlled circuit 22 uniquely selects the signal 16 as the operation D.

The controlled circuit 22 is supplied with the control signal "11" with the first plug-in unit 23 removed in order to uniquely determine its operation.

For example, when the control circuit 24 generates the control signal “01” and the controlled circuit 22 is executing the corresponding operation B, if the first plug-in unit 23 is removed, the controlled circuit 22 operates Change to D. Further, when the first plug-in unit 23 is re-mounted and the control circuit 24 is restarted, the controlled circuit 22 executes the operation A because the initial value of the control signal is the control signal “00”.

[Problems to be Solved by the Invention]

In such a device, when the first plug-in unit 23 in which the control circuit 24 is arranged is removed, the control signal supplied to the controlled circuit 22 may change before and after the removal. In addition, the removed plug-in unit is re-mounted, and the initial value of the control signal supplied when the control circuit 24 is restarted is also supplied to the controlled circuit 22 while the first plug-in unit 23 is removed. It may be different from the control signal.

As described above, in the above example, the controlled circuit 22 changes from the operation B to the operation D and further to the operation A when the first plug-in unit is removed and re-installed. Therefore, for example, when performing communication of a voice signal, there is a possibility that voice interruption or noise occurs every time the operation of the controlled circuit 22 changes. Also, since the operation differs before and after the removal of the first plug-in unit 23, for example, in the case of data communication, maintenance work such as replacement of the first plug-in unit 23 equipped with the control circuit 24 is performed. As a result, the operation of the device may be seriously affected.

Therefore, an object of the present invention is to provide an initial value determination device that can stop and restart the operation of the control circuit without affecting the operation of the controlled circuit.

[Means for solving the problem]

The initial determination device of the present invention comprises: (i) a control circuit that outputs a control signal instructing a predetermined operation; and (ii) a controlled circuit that performs a predetermined operation according to the supplied control signal.
i) control signal stop detection means for detecting whether or not the control signal from the control circuit is stopped, and (iv) control signal immediately before the stop of the control signal from the control circuit is detected by this control signal stop detection means. And (v) the value held in the control signal holding means instead of the control signal from the control circuit while the stop of the control signal is detected by the control signal stop detecting means. And (vi) when the control circuit restarts the supply of the control signal, its initial value becomes equal to the value held in the control signal holding means. And an initialization unit for initializing the control circuit.

That is, the initial value determination device of the present invention holds the value of the control signal immediately before stopping the operation of the control circuit, and operates the controlled circuit even while the operation of the control circuit is stopped by this value. Further, the control circuit is initialized when the control circuit is restarted so that the control signal having the same value as the held value is output.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to Examples.

FIG. 1 is a block diagram showing the configuration of an initial value determination device according to an embodiment of the present invention.

The initial value determination device includes a first plug-in unit 31 and a second plug-in unit 31.
It has a plug-in unit 32. The first plug-in unit 31 has a control circuit 33 and an initialization circuit 34. The control circuit 33 supplies a control signal for instructing the second plug-in unit 32 to perform a predetermined operation from the control terminals 36 and 37. The control circuit 33 receives the monitor signal from two packages that perform the same processing as shown in FIG. 4, for example, and outputs a predetermined control signal. The initialization circuit 34 is
This is a circuit for determining the initial value of the control circuit 33 when the first plug-in unit 31 is removed and re-mounted. The initialization circuit 34 outputs the control signal output to the control terminals 36 and 37 immediately before the removal of the first plug-in unit 31 to the initial value terminal 3
The control circuit 33 is initialized so that a control signal equal to this is output even after re-mounting.

The second plug-in unit 32 includes a memory circuit 41 and a controlled circuit 42. The memory circuit 41 is mounted with the first plug-in unit 31, and the control terminal 3 is operated while the control circuit 33 is operating.
The control signal supplied via 6 and 37 is directly supplied to the controlled circuit 42 and the first plug-in unit 31. on the other hand,
In the memory circuit 41, the operation of the control circuit 33 is stopped or the first
When the plug-in unit 31 is removed, a detection unit (not shown) for detecting this is provided. The first plug-in unit is removed, for example, when the control circuit 33 fails due to some cause or when the control circuit 33 is replaced because a predetermined usage period has passed before the failure. Further, the operation stop of the control circuit 33 occurs, for example, when the control circuit 33 and the controlled circuit 42 have different power supplies and are started and stopped at different times. The storage circuit 41 is a first detection unit (not shown).
When the removal of the plug-in unit 31 or the stop of the operation of the control circuit 33 is detected, the control signal immediately before that is stored in, for example, a latch circuit (not shown). The memory circuit 41 is adapted to continuously supply the stored control signal to the controlled circuit.

The controlled circuit 42 performs a predetermined operation according to the control signal supplied from the storage circuit 41. For example, when supplied from two packages performing the same processing as shown in FIG. 4, the controlled unit 42 performs the operation shown in FIG. 5 according to the control signal.

FIG. 2 shows the circuit configuration of the control circuit 33.

The control circuit 33 includes a first RS (reset set) flip-flop 43 and a second RS flip-flop 44. The set output of the first RS flip-flop 43 is connected to the control terminal 36 of the first plug-in unit 31,
The set output of the RS flip-flop 44 is connected to the control terminal 37.

FIG. 3 shows a circuit configuration of an initialization circuit 34 to which such a control circuit 33 is connected.

The control circuit 33 includes a time limit circuit 44. Time circuit 44
Is a control circuit in which the first plug-in unit 31 is mounted.
It outputs "1" for a fixed time when 33 starts up, and outputs "0" thereafter. The time circuit 44 is connected to one of the input terminals of the first to fourth NAND gates 46, 47, 48 and 49 each having two input terminals. The other input terminal of the first NAND gate 46 is connected to the initial value terminal 38 of the first plug-in unit 31. The other input terminal of the second NAND gate 47 is connected to the output terminal of the first inverting gate 51, and the input terminal of the first inverting gate 51 is connected to the initial value terminal 38. The other input terminal of the third NAND gate 86 is connected to the initial value terminal 39. The other input terminal of the fourth NAND gate 49 is connected to the output terminal of the second inverting gate 52, and the input terminal of the second inverting gate 52 is connected to the initial value terminal 39.

The initialization circuit 34 includes first to fourth AND gates 53, 54, 55 and 56 each having two input terminals. One of the input terminals of the first to fourth AND gates 53 to 56 is connected to the output terminals of the first to fourth NAND gates 46 to 49, and the other input terminal is connected to the first plug-in. The input terminals 57 to 60 of the unit 31 are connected. Monitoring signals are supplied to these input terminals 57 to 60 from a plurality of packages shown in FIG. 4, for example.

The output terminals of the first AND gate 53 and the second AND gate 54 are connected to the input terminals of the first RS flip-flop 43 via terminals 66 and 67, respectively. The output terminals of the third AND gate 55 and the fourth AND gate 56 are connected to the second RS flip-flop 44 via terminals 68 and 69, respectively.
Is connected to the input terminal of

Next, the operation of the initial value determination device configured as described above will be described.

From the control circuit 33 of this initial value determination device, the control signal "0
It is assumed that 0 "," 01 "," 10 ", and" 11 "are output, and the controlled circuit 42 performs each operation shown in FIG. 5 in response to each of these control signals.

The first plug-in unit already implemented
For example, the signals “1”, “0”,
“0” and “1” are input respectively, and as a result, the control circuit 33
It is assumed that the control signal "01" is output from the. In this case, the control signal “01” is supplied to the memory circuit 41 of the second plug-in unit 32 via the control terminals 36 and 37, and the memory circuit 41 supplies the supplied control signal as it is to the controlled circuit 42. . The controlled circuit 42 performs the operation B corresponding to the supplied control signal “01”.

On the other hand, the control signal “01” directly output from the memory circuit 41 is also supplied to the first plug-in unit 31.
Each of the NAND gates 46 to 49 of the initialization circuit 34 is supplied with the signal "1" or "0" according to the control signal, but the time circuit 44
Since the signal "0" is supplied from, the signal "1" is always output regardless of the control signal. Therefore, when the first plug-in unit 31 is mounted and the control circuit 33 is operating, the control signal supplied from the memory circuit 41 is the control circuit 33.
Does not affect the operation of. That is, each AND gate 53
Since the signal "1" is always supplied to one of the input terminals of ~ 56, the signals input from the input terminals 57-60 are directly supplied to the control circuit 33.

When the first plug-in unit 31 is removed, the control signal “11” is apparently supplied at the control signal input point of the second plug-in unit 32. But,
In the second plug-in unit 32, the memory circuit 41 detects the removal of the first plug-in unit 31, and stores the control signal “01” immediately before that. Since the storage circuit 41 outputs the control signal "01" after the removal as in the case before the removal, the control circuit 42 continues the operation B.

Next, a case where the first plug-in unit 31 is re-mounted will be described.

Time circuit by re-mounting the first plug-in unit 31
Since the signal "1" is supplied from 44 for a certain period of time, each NAND gate 46 to 49 operates like an inverting gate during this period. Therefore, the control signal “0” supplied through the initial value terminal 38 among the control signals “01” output from the storage circuit 41 which is the same as that before the extraction is inverted to the signal “1” by the first NAND gate 46, and then the 1 is supplied to the AND gate 53. The signal “1” inverted by the first inversion gate 51 is applied to the second NAND gate 47.
Then, it is inverted again to the signal "0" and is supplied to the second AND gate 54. Similarly, according to the control signal “1” supplied through the initial value terminal 39, the signal “0” is supplied to the third AND gate 55 and the signal “1” is supplied to the fourth AND gate 56. These first to fourth AND gates 53 to
Since the same signal as that before the first plug-in unit 31 is removed is supplied from 56, the initial value of the control circuit 33 is the same control signal "01" as before the removal. Therefore, the controlled circuit 42
Continues the same operation B as before the removal of the first plug-in unit 31.

In the embodiment described above, the initialization circuit and the memory circuit are arranged in the first plug-in unit and the second plug-in unit, respectively, but the present invention is not limited to this, and, for example, they are independent plugs. You may arrange in an in-unit.

〔The invention's effect〕

Thus, according to the initial value determination device of claim 1,
The value of the control signal immediately before the supply of the control circuit is stopped is held, and the control signal of this value is shared with the controlled circuit while the supply of the control signal from the control circuit is stopped. As a result, the controlled circuit can be operated even while the supply of the control signal from the control circuit is stopped. Further, since the control circuit is initialized so that the initial value of the control signal when the control circuit is restarted is the value immediately before the stop held,
The operation of the controlled circuit does not suddenly change before and after the supply of the control signal from the control circuit is resumed, and the operation of the control circuit can be stopped and restarted without affecting the operation of the controlled circuit.

Further, according to the initial value determination device of the second aspect, since the initialization means is composed of the gate circuit and the time circuit, it can be composed of a simple logic element.

[Brief description of drawings]

1 to 3 are for explaining one embodiment of the present invention, in which FIG. 1 is a block diagram showing a configuration of an initial value determination device, and FIG. 2 is a circuit configuration of a control circuit. Fig. 3 shows the circuit diagram of the first plug-in unit,
FIG. 4 is a block diagram of a conventional device composed of a plug-in unit, and FIG. 5 is an explanatory diagram for explaining the operation of a controlled circuit corresponding to a control signal. 31 ... First plug-in unit, 32 ... Second plug-in unit, 33 ... Control circuit, 34 ... Initialization circuit, 41 ... Memory circuit, 42 ... Controlled circuit.

Claims (2)

(57) [Claims] 1. A control circuit for outputting a control signal for instructing a predetermined operation, a controlled circuit for performing a predetermined operation according to the supplied control signal, and whether the control signal from the control circuit is stopped. Control signal stop detecting means for detecting whether the control signal stop detecting means holds the value of the control signal immediately before the stop of the control signal from the control circuit is detected by the control signal stop detecting means, and the control signal stop During the stop period, the control signal of the value held in the control signal holding means is supplied to the controlled circuit instead of the control signal from the control circuit while the stop of the control signal is detected by the detecting means. Supply means and initialization for initializing the control circuit so that its initial value becomes equal to the value held in the control signal holding means when the control circuit restarts supplying the control signal The initial value determination apparatus characterized by comprising a stage. 2. The initialization means comprises a gate circuit and a time limit circuit for supplying to the gate circuit a logic signal which is always inverted for a predetermined time when the control circuit is restarted, and output from the control signal holding means. The initial value determination device according to claim 1, wherein the control signal to be fetched is fetched from the gate circuit only when the control circuit is restarted, and the initial value is determined by the fetched control signal.