JP7001312B2 - Digital hourly relay - Google Patents

Description

The present invention relates to a highly reliable digital time element relay, which is widely used in the railway field. Regarding digital timekeeping relays with improved fail-safety.

The time element relay has an output voltage of 0V or 24V depending on the control input whose voltage is switched between 0V and 24V, for example (see FIG. 12A), but the slow-moving relay has an on-transition of the control input. The timing at which the output is turned on (make, closed) is delayed by the amount of time during slow movement, and the timing at which the output is turned off (break, open) is relaxed according to the off transition of the control input in the slow release relay. It is designed to be delayed by the time of the relay.
Digital time element relays are digital time element relays that embody the hour element setting unit and time measurement means with digital circuits. In the railway field where fail-safety is important, in addition to digitization, , The time element setting unit and the measurement means are also duplicated (see, for example, Patent Documents 1 to 4).

A typical configuration of such a digital time relay 10 (see FIG. 12B) is a control input circuit 11, a power supply circuit 12, a pair of central processing units 13a, 13b, a pair of oscillators 14a, 14b, and a pair. It includes setting units 15a and 15b, a collating means 16, a relay driving unit 17, and an output relay 18.
Among them, the control input circuit 11 arranges the waveform of the control input and sends it to the central processing units 13a and 13b, and the power supply circuit 12 generates the operating power of the central processing units 13a and 13b from the control input. Is.

The central processing unit 13a (first central processing unit) is composed of a digital arithmetic control circuit such as a microprocessor (MPU), and performs relay drive control by operating the oscillation signal of the oscillator 14a as a clock. In the relay drive control, the set value is input from the setting unit 15a (first setting unit), and the clock element corresponding to the set value is reflected in the control content.
The central processing unit 13b (second central processing unit) also consists of a digital arithmetic control circuit such as a microprocessor (MPU), which operates as a clock using the oscillation signal of the oscillator 14b to perform relay drive control. It has become. Moreover, the central processing unit 13b inputs a set value from the setting unit 15b (second setting unit) at the time of the relay drive control, and reflects the time element corresponding to the set value in the control content. ..

Therefore, when the same value is set in the setting units 15a and 15b, the central processing units 13a and 13b perform the same processing based on the same value, so that the relay sent from the central processing units 13a and 13b to the relay drive unit 17 The contents of the drive control match if there is no abnormality in the setting units 15a and 15b and the central processing units 13a and 13b.
The collation means 16 confirms the presence or absence of the match, but since there are variations in the materialization, it is shown by a alternate long and short dash line. As a typical example, the central processing devices 13a and 13b collaborate with each other by the internal monitoring means and the external monitoring means (see, for example, Patent Document 1), and the central processing devices 13a and 13b mutually. Examples include those that confirm the match between the own system data and other system data (see, for example, Patent Document 3), those that are confirmed by the external collation circuit of the central processing devices 13a and 13b (see, for example, Patent Document 4), and the like. ..

When the collation results by the collation means 16 match, the relay drive unit 17 turns the output relay 18 on / off (make / break, close / open) according to the relay drive control instruction received from the central processing units 13a and 13b. However, when the collation results by the collation means 16 do not match, the output relay 18 is placed in a predetermined safe state, for example, by ignoring the relay drive control instruction received from the central processing units 13a and 13b. It is designed to be turned off (break, open).
The output relay 18 is a relay having a simple structure without an additional circuit for time elements. Basically, a highly reliable signal relay suitable for railway equipment is used, but depending on the application, it may be in JIS standard or the like. General relays such as compatible electromagnetic relays and semiconductor relays may be used.

Japanese Unexamined Patent Publication No. 3-292258 Japanese Unexamined Patent Publication No. 4-154475 Japanese Unexamined Patent Publication No. 10-239463 Japanese Unexamined Patent Publication No. 2006-33894

In such a digital time element relay, the ability to detect an abnormality in a circuit or the like is enhanced by combining the matching means 16 with the digital circuit units 13 to 15 that handle the time element in a dual system (multiple system). It ensures the fail-safety required in the railway field.
However, depending on the mode of use, the anomaly detection capability may differ depending on whether it operates continuously for 24 hours or intermittently, so the level required by regulations etc. may be different. It is desirable and important to improve safety to a higher level than just that.

In detail, many conventional devices designed as fail-safe devices are premised on continuous operation for 24 hours, and in that case, double / multiple system matching is performed at all times or at any time. As a result, it is possible to quickly detect an abnormality at the stage where a single failure occurs for a failure or the like that occurs in only one of the plurality of systems, so that the abnormality detection ability is high.
On the other hand, in the case of a slow-moving digital hourly relay that obtains operating power from a control input, such as the digital hourly relay 10, from the viewpoint of circuit operation, it is not continuously operated for 24 hours and the power is turned off. Is often a so-called intermittent operation that can exist multiple times in a day.

In the digital hour element relay 10, the setting units 15a and 15b used for setting the hour element are dual systems in consideration of safety, but they are single when the power is turned off when functions such as collation become inoperable. Even if it is a failure, the abnormality cannot be detected, and the detection of the abnormality is waited until the supply of the operating power based on the control input is restarted. Therefore, a further failure occurred before the power was restored, or a serious failure occurred, and the same failure occurred in the same part such as the same bit in both the setting units 15a and 15b of the dual system. In this case, it is too late for the collation after the power is restored, and even though the settings are in the error state in both the setting units 15a and 15b of the dual system, the abnormality cannot be detected. Decreases.

By the way, it is also possible to invert the collation target data in one system and then send it to the other, and in the other system, collate the received inverted data with the inverted data of the collation target data of the own system. If the improvement of the ability to detect the failure of the data input terminal is a failure of only one system or a failure of different modes in both systems, it seems to be expected, but the same part related to both data input terminals. It is not clear how much the abnormality detection capability for the same failure will be improved. It seems that the data inversion is performed only by the software, or the central processing units 13a, 13b, etc. maintain the sameness including the software, but it is not clear. Further, even if the method is extended to the set values of the setting units 15a and 15b and the setting values are repeatedly inverted, the abnormality detection ability for the same failure of the same part in both the setting units 15a and 15b is obtained by itself. It is not clear whether or not it will increase sufficiently.

On the other hand, regarding the hardware failure of the dual system setting units 15a and 15b, the short failure and the short failure or the open failure and the open failure are the same as the so-called different failure which is a different type of failure such as a short failure and an open failure. It can be said that failures occur more frequently. Circuit and element failures due to familiar causes such as excessive surge voltage application and undesired short-circuit failures often cause the same failure at multiple locations for just one cause, but multiple failures due to different causes. This is because the frequency of occurrence at the same time or in the near future is relatively small.

Therefore, in order to realize a digital time element relay with excellent fail-safe property, the ability to detect anomalies in the same part of the setting part of each system, even if the cost and identity of the time element are sacrificed to some extent. It is a technical issue to revise the time element setting method so that the number of relays increases.

The digital time element relay of the present invention (Solution 1) was devised in an attempt to solve such a problem at the expense of cost.
The first setting unit equipped with the first mechanical switch for setting the hour element, the first hour element setting means for setting the hour element based on the set value, and the first measuring the elapsed time based on the set hour element. A first central processing unit equipped with a timekeeping means, a second setting unit provided with a second mechanical switch for setting a time element, a second hour element setting means for setting a time element based on the set value, and the second setting unit thereof. A collation to check the identity between the processing of the first central processing unit and the processing of the second central processing unit with the second central processing unit provided with the second timekeeping means for measuring the elapsed time based on the set time element. In a digital timekeeping relay provided with a means and a relay drive unit that selectively drives an output relay according to the confirmation result of its identity.
Both the first mechanical switch and the second mechanical switch are provided with a plurality of terminals selected according to a switching operation, and any one of the plurality of terminals is selected in any of the switching states. It is an alternative switch, and the first central processing unit is provided with a rationality diagnostic means for examining whether or not the set value of the first setting unit is a value in an alternative state, and the second central processing unit. The processing unit is provided with a rationality diagnostic means for checking whether or not the set value of the second setting unit is a value in an alternative state.
When any of these rationality diagnostic means diagnoses that the value is not in the alternative state, the drive of the output relay is suppressed.

Further, the digital hourly relay of the present invention (solution 2) is the digital hourly relay of the above-mentioned solution 1.
Both the first mechanical switch and the second mechanical switch have three or more terminals that are switched according to the switching operation and are selected correspondingly.
Both the first central processing unit and the second central processing unit make a logical determination as to whether each of the set values corresponds to a positive logic or a negative logic, and perform inversion processing when the logics are different. It is characterized by having a logic matching means for unifying the logic.

Further, the digital hourly relay of the present invention (solution 3) is the digital hourly relay of the above-mentioned solution 2.
Both the first central processing unit and the second central processing unit correspond to each of the set values after the execution of the logical matching means and before the time element is set by the respective time element setting means. It is characterized by being able to compare things.

Further, the digital time element relay of the present invention (Solution 4) was devised in an attempt to solve the above problems at the expense of hardware identity.
The first setting unit equipped with the first mechanical switch for setting the hour element, the first hour element setting means for setting the hour element based on the set value, and the first measuring the elapsed time based on the set hour element. A first central processing unit equipped with a timekeeping means, a second setting unit provided with a second mechanical switch for setting a time element, a second hour element setting means for setting a time element based on the set value, and the second setting unit thereof. A collation to check the identity between the processing of the first central processing unit and the processing of the second central processing unit with the second central processing unit provided with the second timekeeping means for measuring the elapsed time based on the set time element. In a digital timekeeping relay provided with a means and a relay drive unit that selectively drives an output relay according to the confirmation result of its identity.
The first mechanical switch and the second mechanical switch both have a plurality of terminals selected according to the switching operation, and coincide with those in which the selected state and the switching state of those terminals are encoded. It is a coded switch, and is characterized in that the coding in the first mechanical switch and the coding in the second mechanical switch have complementarity for each corresponding terminal.

Further, the digital hourly relay of the present invention (solution 5) is the digital hourly relay of the above-mentioned solution 4.
Both the first central processing unit and the second central processing unit compare the set values corresponding to each of the set values before setting the time element by the respective time element setting means. It is characterized by being.

Further, the digital hourly relay of the present invention (solution 6) is the digital hourly relay of the above-mentioned solution 5.
Both the first central processing unit and the second central processing unit make a logical determination as to whether each of the set values corresponds to a positive logic or a negative logic, and perform inversion processing when the logics are different. It is characterized by having a logic matching means for unifying the logic.

Further, the digital hourly relay of the present invention (solution 7) is the digital hourly relay of the above-mentioned solution 6.
Both the first central processing unit and the second central processing unit are provided with a logic notification unit indicating whether the set value of each of the setting units corresponds to positive logic or negative logic. It is characterized by.

Further, the digital time element relay of the present invention (Solution 8) was devised in an attempt to solve the above problems at the expense of cost or even at the expense of hardware identity. ,
The first setting unit equipped with the first mechanical switch for setting the hour element, the first hour element setting means for setting the hour element based on the set value, and the first measuring the elapsed time based on the set hour element. A first central processing unit equipped with a timekeeping means, a second setting unit provided with a second mechanical switch for setting a time element, a second hour element setting means for setting a time element based on the set value, and the second setting unit thereof. A collation to check the identity between the processing of the first central processing unit and the processing of the second central processing unit with the second central processing unit provided with the second timekeeping means for measuring the elapsed time based on the set time element. In a digital timekeeping relay provided with a means and a relay drive unit that selectively drives an output relay according to the confirmation result of its identity.
Both the first mechanical switch and the second mechanical switch are provided with a plurality of terminals selected according to a switching operation, and any one of the plurality of terminals is selected in any of the switching states. It is a combination of an alternative switch and a coded switch that has multiple terminals that are selected according to the switching operation and that matches the selected state of those terminals with the encoded switching state. ,
The coding in the coded switch of the first mechanical switch and the coding in the coded switch of the second mechanical switch have complementarity for each corresponding terminal.
The first central processing unit is provided with a rationality diagnostic means for examining whether or not the portion of the set value of the first setting unit related to the alternative type switch of the first mechanical switch is in the alternative state. It is rational to check whether or not the second central processing unit has a value in the alternative state for the portion related to the alternative type switch of the second mechanical switch among the set values of the second setting unit. Equipped with diagnostic means,
When any of these rationality diagnostic means diagnoses that the value is not in the alternative state, the drive of the output relay is suppressed.

Further, the digital hourly relay of the present invention (solution 9) is the digital hourly relay of the above-mentioned solution 8.
The alternative switch of the first mechanical switch and the alternative switch of the second mechanical switch are both switched according to the switching operation, and the switching state is selected accordingly. Has more than one,
When both the first central processing unit and the second central processing unit make a logical determination as to whether the part corresponding to each alternative type switch of the set values is positive logic or negative logic, and the logics are different. It is characterized by having a logic matching means for unifying the logic by performing inversion processing.

Further, the digital hourly relay of the present invention (solution 10) is the digital hourly relay of the above-mentioned solution 9.
Of the set values of the first setting unit, the logic of whether the logic is positive or negative with respect to the portion related to the alternative type switch of the first mechanical switch, and the code of the first mechanical switch among the set values of the first setting unit. Correspondence between the logic of positive logic or negative logic related to the part related to the type switch, and whether it is positive logic or negative logic related to the part related to the alternative type switch of the second mechanical switch among the set values of the second setting unit. The correspondence between the logic of the above and the logic of the positive logic or the negative logic regarding the part related to the code type switch of the second mechanical switch among the setting values of the second setting unit is the same.
Both the first central processing unit and the second central processing unit selectively invert the set values corresponding to the respective coded switches based on the logical determination of the logical matching means. It is characterized by having means.

Further, the digital hourly relay of the present invention (solution 11) is the digital hourly relay of the above-mentioned solution 10.
Both the first central processing unit and the second central processing unit correspond to each of the set values after the execution of the selective inversion means and before the time element is set by the respective time element setting means. It is characterized by being able to compare what it does.

In such a digital time relay of the present invention (solutions 1 and 8), after adopting an alternative type switch for the mechanical switch of the setting unit of both systems, it is rational for the central processing unit of both systems. By adding diagnostic means to check whether the conditions of the alternative state are satisfied for both set values, abnormalities including the same failure at the same site can be accurately detected. Then, when an abnormality in which the condition of the alternative state is not satisfied is detected in either of the two systems, the drive of the output relay is suppressed, so that the malfunction is accurately avoided.
Therefore, according to the present invention, it is possible to realize a digital time element relay having a high abnormality detection ability for the same failure of the same part related to the setting unit of each system.

Further, in the digital hourly relay of the present invention (solutions 4 and 8), by adopting a coded switch for the mechanical switch of the setting unit of both systems, the switch having few terminals has many switching states. Therefore, the component mounting efficiency is improved.
Moreover, by giving complementarity to those mechanical switches, the expression state of abnormal values caused by the same failure at the same site becomes complementary, so that the same failure at the same site becomes the set value of both systems. Since the occurrence is reversed as in the case of different failures, abnormalities due to the same failure at the same site can be easily detected and the detection accuracy is improved.
Therefore, also by the present invention, it is possible to realize a digital time element relay having a high abnormality detection ability for the same failure of the same part related to the setting unit of each system.

Further, in the digital hourly relay of the present invention (solutions 2 and 9), an alternative switch having a large number of terminals and having redundancy in the expression of the bit pattern and the like related to the set value is adopted as the mechanical switch. In addition, by additionally introducing a logical matching means that utilizes the redundancy so that the logical representation of the set values of both systems is unified, the identity of the software etc. is maintained for the central processing device of both systems. It will be easier to do.

Further, in the digital time element relay of the present invention (solutions 3, 5, 11), the set values of both systems are compared before the time element is set by the hour element setting means in the central processing unit of both systems. By making it possible to perform the above, it is not necessary to wait for the collation by the general-purpose collation means of the dual system, and even if the collation by the collation means does not leak, it surely does not leak. An abnormality related to the set value is detected.

Further, in the digital time element relay of the present invention (solution 6), the logical representation of the set values of both systems is unified, so that the time element is set for the software of the central processing unit of both systems. After that, it becomes easy to maintain the identity of the parts.

Further, in the digital time element relay of the present invention (solution 7), by providing a logic notification unit in each system, the logic determination in the logic matching means becomes simple.

Further, in the digital hourly relay of the present invention (solution 10), the logic of the alternative type switch that can tell whether the setting value is positive logic or negative logic based on the redundancy, and the positive logic only by the setting value. By making the logic of the coded switch, which does not know whether it is negative logic or not, correspond in advance, the correspondence between the logic of the alternative type switch and the logic of the coded switch, which has been determined in advance, can be obtained. Based on this, it is possible to know whether the coded switch corresponding part of the set values in each system is positive logic or negative logic, so it is not necessary to attach an external member such as a logical notification unit, and in addition to the logical matching means. Even the selective inversion means can easily perform the logic determination.

It is a block diagram which shows the structure of the digital hour element relay about Example 1 of this invention. (A) shows the relationship between the setting and the output of the rotary switch (alternative type switch) of the pull-down connection, and (b) shows the relationship between the setting and the output of the rotary switch (alternative type switch) of the pull-up connection. .. It is a table which shows the state detection status which concerns on a setting part. The second embodiment of the present invention is a block showing the structure of a digital hourly relay. It is a block diagram which shows the structure of the digital hour element relay about Example 3 of this invention. It is a table which shows the state detection status which concerns on a setting part. It is a table which shows the state detection status which concerns on a setting part. It is a table which shows the state detection status which concerns on a setting part. It is a table which shows the state detection status which concerns on a setting part. It is a block diagram which shows the structure of the digital hour element relay about Example 4 of this invention. It is a block diagram which shows the structure of the digital hour element relay about Example 5 of this invention. The structure of a conventional digital hourly relay is shown, (a) is a symbol diagram and a waveform example of a slow-moving / slow-release relay, and (b) is a block configuration diagram of a slow-moving / slow-release relay.

A specific embodiment for carrying out such a digital time element relay of the present invention will be described with reference to the following Examples 1 to 5.
The first embodiment shown in FIGS. 1 to 3 embodies the above-mentioned solution 1 (claim 1 at the time of filing), and the second embodiment shown in FIG. 4 is the above-mentioned solution 2 to 2. 3 (claims 2 to 3 at the time of filing) is embodied, and the third embodiment shown in FIGS. 5 to 9 uses the above-mentioned solutions 4 to 7 (claims 4 to 7 at the time of filing). The embodiment 4 shown in FIG. 10 embodies the above-mentioned solutions 8 to 11 (claims 8 to 11 at the time of filing), and is the embodiment of the fifth embodiment shown in FIG. Embodies the above-mentioned solution 8 (claim 8 at the time of filing).
It should be noted that, in the illustration thereof, the same components as those in the conventional case are designated with the same reference numerals, and the description of them in the background technology column is common to each of the following examples, so that they are duplicated. The explanation will be omitted again, and the differences from the conventional one will be mainly explained below.

The specific configuration of the first embodiment of the digital hourly relay of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the structure of the digital hourly relay 20, and FIG. 2A shows the relationship between the setting and the output of the rotary switch (alternative type switch) of the pull-down connection, and FIG. b) shows the relationship between the setting and the output of the rotary switch (alternative type switch) of the pull-up connection.

Since the digital hourly relay 20 (see FIG. 1) has been partially modified while following the above-mentioned digital hourly relay 10 (see FIG. 12B), the modified portion will be mainly described.
The difference between the digital timekeeping relay 20 and the digital timekeeping relay 10 (see FIG. 1) is that for one of the dual system parts (left system in the figure), the setting unit 15a is equipped with an alternative switch 22. Regarding the point that became the unit 21a (first setting unit) and the software of the central processing unit 13a (first central processing unit), the existing time element setting means 13aa (first time element setting means) and the timekeeping means 13ab (first). A new rationality diagnostic means 23a has been added to the timekeeping means).

The difference between the digital timekeeping relay 20 and the digital timekeeping relay 10 for the other side of the dual system portion (right system in the figure) is that the setting unit 15b also has a setting unit 21b (the first) having an alternative switch 22 having the same configuration. 2 Setting unit) and the existing time element setting means 13ba (second time element setting means) and timekeeping means 13bb (second timekeeping means) for the software of the central processing unit 13b (second central processing unit). This is the point that a new rationality diagnostic means 23b has been added.

The control input circuit 11, the power supply circuit 12, the oscillators 14a and 14b, the collation means 16, the relay drive unit 17, and the output relay 18, which are other components, may be as described above.
The timekeeping means 13ab and 13bb measure the passage of time related to the time element set in each system, and the existing one may be used as it is. However, for the time element setting means 13aa and 13ba, the setting value acquisition destination is obtained. The timekeeping setting means 13aa changes the acquisition destination of the set value from the setting unit 15a to the rationality diagnosis means 23a, and the timekeeping setting means 13ba has the setting value acquisition destination rational from the setting unit 15b. It has been changed to the sexual diagnosis means 23b.

The alternative type switch 22 is a mechanical switch that can be touched by a person or operated by using a tool, and a switch incorporated as a first mechanical switch in the setting unit 21a is also used as a second mechanical switch in the setting unit 21b. The built-in one also has multiple terminals that are selected according to the switching operation, and in any switching state, select one of the multiple terminals and select the selected terminal and a common terminal (not shown). Is made conductive, and the common terminal is not made conductive with other non-selected terminals. A rotary switch with a basic configuration that does not perform encoding is typical, but a slide switch may be an alternative type.

To explain how to use a rotary switch with four terminals selected according to the switching operation as a specific example (see Fig. 2), pull-down connection (see Fig. 2) and pull-up connection (see Fig. 2). ), The set value becomes positive logic in the pull-down connection, and the set value becomes negative logic in the pull-up connection. More specifically, in the case of pull-down connection (see (a) in the figure), when the switching state by operation is "1", the 4-bit value corresponding to the terminal selection state becomes "0001" and the switching state is "2". When "", the selection state correspondence value becomes "0010", when the switching state is "3", the selection state correspondence value becomes "0100", and when the switching state is "4", the selection state correspondence value becomes "1000". Become. On the other hand, in the case of a pull-up connection (see (b) in the figure), the selection state correspondence value becomes "1110" in the switching state "1", and the selection state correspondence value becomes "1101" in the switching state "2". In the switching state "3", the selection state correspondence value becomes "1011", and in the switching state "4", the selection state correspondence value becomes "0111".

Each of the rationality diagnostic means 23a and 23b relates to the alternative type switch 22 by examining whether or not the set value received from the setting units 21a and 21b satisfies the known alternative requirement with high redundancy. It is designed to determine the presence or absence of a failure.
Specifically, any of the rationality diagnostic means is the alternative switch 22 of the own system (that is, the alternative switch 22 of the setting unit 21a in the rationality diagnosis means 23a of the central processing device 13a of the left system, the right system. In the rationality diagnosis means 23b of the central processing apparatus 13b, if the setting value of the alternative switch 22) of the setting unit 21b is positive logic, only one of the four bits is "1", and the remaining three. When the bit is "0", it is determined that the alternative type switch 22 is normal, but in other cases, it is determined that the alternative type switch 22 is out of order.

On the other hand, if the set value of the alternative switch 22 of the own system is negative logic, only 1 bit out of 4 bits is "0" in any rationality diagnosis means, and the remaining 3 bits. When is "1", it is determined that the alternative type switch 22 is normal, but in other cases, it is determined that the alternative type switch 22 is out of order.
Further, the rationality diagnosis means 23a and 23b all pass the set value to the own system's time element setting means 13aa and 13ba when it is determined that the own system's alternative switch 22 is normal, but the own system's When it is determined that the alternative switch 22 is abnormal, the set value is not passed to the hour element setting means. Therefore, the digital time relay 20 suppresses the drive of the output relay 18 when it is diagnosed that any of the rationality diagnosis means 23a and 23b is not a value in the alternative state with respect to the set value.

The usage mode and operation of the digital hourly relay 20 of the first embodiment will be described with reference to the drawings. FIG. 3 is a table showing a state detection status related to the setting units 21a and 21b.

For specific explanation (see FIG. 3), as an example, in any of the setting units 21a and 21b, the resistance connection of the alternative type switch 22 is pulled down (see FIG. 2A), and the alternative is selected. It is assumed that the set value of the type switch 22 is positive logic and the switching state of the alternative type switch 22 is "2".
Then, if both the setting units 21a and 21b are normal, both the setting value of the setting unit 21a and the setting value of the setting unit 21b become "0010", and the alternative requirement is satisfied. Therefore, the rationality diagnosis means 23a, Since the diagnostic results of 23b are all "normal" and the set state is correctly detected, the output relay 18 operates appropriately in the same manner as the digital time relay 10 described above.

On the other hand, when a failure occurs in the alternative switch 22, for example, when the terminal corresponding to the second bit from the bottom and the terminal corresponding to the third bit from the bottom are in a short-circuited state, the cause of such a short-circuit failure is inside the switch. Since the bit values of both terminals are forced to be the same regardless of whether they are external to the switch or external to the switch, the set value of the alternative switch 22 in which the short-circuit failure occurred is changed from "0010" to "0110" in this case. Become. Further, for example, when the terminal corresponding to the second bit from the bottom becomes disconnected, the bit value of the corresponding terminal is fixed, and the set value of the alternative switch 22 in which such an open failure occurs is changed from "0010" to "0000". "become.

The type of failure is the same regardless of whether the failure type is a short failure or an open failure, the failure portion is either one or both of the setting units 21a and 21b, and the failure occurrence parts in the setting units 21a and 21b are different. However, if the alternative switch 22 fails, the alternative requirement is no longer satisfied, which is detected by the applicable one of the rational diagnostic means 23a and 23b, and the diagnosis result becomes "abnormal". Since it is correctly detected that there is an abnormality in the setting state, unlike the digital hourly relay 10 described above, the operation of the output relay 18 is suppressed without waiting for the collation result of the collation means 16, and safety is ensured. Will be done.

The specific configuration and the like of the second embodiment of the digital hourly relay of the present invention will be described with reference to the drawings. FIG. 4 is a block showing the structure of the digital hourly relay 30.

The difference between the digital hourly relay 30 and the digital hourly relay 20 of the first embodiment described above is that the setting unit 21a of the left system is connected to the alternative type switch 22 in the pull-down connection as in the above example, and the set value is positive logic. However, unlike the above example, the setting unit 21b of the right system is connected to the alternative switch 22 by pull-up and the set value becomes negative logic, and the software of the central processing device 13a of the left system. The logical matching means 31a and the comparing means 32a are added to the above, and the logical matching means 31b and the comparing means 32b are added to the software of the central processing apparatus 13b of the right system.

The alternative type switch 22 itself inherits the mechanical switch of the above example as it is, and in both the setting units 21a and 21b, the switching state and the number of selection terminals are four or more, but the left system. While the pull-down connection is adopted in the setting unit 21a of the right system, the pull-up connection is adopted in the setting unit 21b of the right system, and the logic is different depending on the setting values of both systems. For example, when the switching state of the alternative switch 22 is “2” as shown in the figure, the set value of the setting unit 21a is “0010”, whereas the set value of the setting unit 21b is “1101”.

The logical matching means 31a and 31b are realized by the same program in order to maintain the sameness of the software of both systems, and when the setting value is input from the corresponding system among the setting units 21a and 21b, for example, After counting the number of bits of "0" and "1" included in the set value, a logical judgment is made to determine whether the logic of the set value is positive logic or negative logic by a judgment method such as majority decision. In the case of negative logic, the logic of the set value is matched in both systems by performing logic inversion processing for each bit on the set value.

After the logics of the set values in both systems are matched by such logical matching means 31a and 31b, not only the program code of the central processing units 13a and 13b but also the detailed program execution state of the central processing units 13a and 13b Up to (process), both systems will be matched, or at least both systems will be easy to match.
Therefore, the degree of freedom in selecting whether to use the pull-down connection or the pull-up connection for the alternative switch 22 is increased.

The comparison means 32a and 32b transmit and receive the set values of both systems whose logics are matched by the logical matching means 31a and 31b, and then compare them, and explicitly confirm the matching of the set values themselves. It has become a thing. In the illustrated example, the comparison means 32a and 32b are executed between the execution of the logical matching means 31a and 31b and the execution of the rational diagnosis means 23a and 23b, but the comparison means 32a and 32b are rational. It may be executed after the execution of the diagnostic means 23a and 23b. Before the execution of the time element setting means 13aa and 13ba, it is possible to prevent an undesired relay drive in advance and accurately.

The specific configuration of the third embodiment of the digital hourly relay of the present invention will be described with reference to the drawings. FIG. 5 is a block diagram showing the structure of the digital hourly relay 40.
The digital hourly relay 40 differs from the digital hourly relay 30 of the second embodiment described above in that the mechanical switch of the setting unit 21a is a coded switch 41 and the mechanical switch of the setting unit 21b is coded. The point that the type switch 42 is used, the points that the logical matching means 31a and 31b are the logical matching means 44a and 44b, respectively, and the central processing device 13a is provided with the logical notification unit 43a and the central processing device 13b is provided with the logical notification unit 43a. The point is that the logical notification unit 43b is attached.

Both the coded switch 41 and the coded switch 42 are mechanical switches that can be manually operated, and are provided with a plurality of terminals selected according to the switching operation, and the selected terminal and the common terminal are made conductive, and other non-coded switches 41 are provided. The selection terminal and the common terminal are not made conductive, but the number of selection terminals is not limited to one or a fixed number, and the number of switching states is "0" to "9" in the coded switch shown in the figure. There are 10 terminals, which is more than 4 terminals.
In this way, even if the switching state is larger than the number of terminals, the terminal selection state can be made to correspond to the bit string in which the numerical values "0" to "9" assigned to the switching state are coded in binary or binary coded decimal. A large number of switching states can be represented by a small number of terminals.

Moreover, the coded switches 41 and 42 are not exactly the same, and the selection / non-selection of each terminal and the continuity / non-conduction with respect to the common terminal are encoded in the opposite relationship. For example, when the coded switch 41 encodes the switching state "5" with the positive logic "0101", the coded switch 42 encodes the switching state "5" with the negative logic "1010". Therefore, the coding of the coded switches 41 and 42 has the complementarity for each corresponding terminal. Typical examples of such coded switches 41 and 42 include rotary code switches in which a "real" type of positive logic and a "complementary" type of negative logic exist, but slide switches and the like are also complemented by coded types. Anything of sex is fine.

Further, regarding the resistance connection in the setting units 21a and 21b provided with such coded switches 41 and 42, if it is a pull-down connection, the logic of the set value until the set value of the switch is input to the central processing devices 13a and 13b. However, when the resistance connection is a pull-up connection, the logic of the set value is converted to negative logic if it is positive logic and to positive logic if it is negative logic. Therefore, even if the setting units 21a and 21b share and include coded switches 41 and 42 having different complementarities and logics, the setting values to be sent to the central processing units 13a and 13b by selecting the resistance connection Can be arbitrarily adopted in either positive logic or negative logic.

The logical matching means 44a and 44b are the same as the above-mentioned logical matching means 31a and 31b, and the logic of whether the setting value corresponding to each of the setting values input from the setting units 21a and 21b of each system is positive logic or negative logic. When a judgment is made and the logic is different, inversion processing is performed to unify the logic with, for example, a positive logic. However, unlike the above-mentioned logical matching means 31a and 31b, the logic can be discriminated only by individual set values. Since the requirement cannot be used, the setting values input from the setting units 21a and 21b are selectively inverted according to the notifications of the logical notification units 43a and 43b attached to the central processing devices 13a and 13b, respectively. Is to be given.
The logical notification units 43a and 43b send binary information indicating whether the set value of the own system among the setting units 21a and 21b is positive logic or negative logic to the central processing units 13a and 13b.

The usage mode and operation of the digital hourly relay 40 of the third embodiment will be described with reference to the drawings. 6 to 9 are tables showing the state detection status of the setting units 21a and 21b.

For specific explanation (see FIG. 6), as an example, in the setting unit 21a, the switching state of the "real" type coded switch 41 connected by pull-down is set to "5", and the setting unit 21a is set. The value is positive logic "5", the switching state of the "complementary" type coded switch 42 connected by pull-down is set to "5" in the setting unit 21b, and the setting value of the setting unit 21b is negative logic. It is assumed that the indicated value is set to "positive" in the logical notification unit 43a and the indicated value is set to "negative" in the logical notification unit 43b according to the "5".

Then, if both the setting units 21a and 21b are normal, the set value of the setting unit 21a becomes "0101", and the set value of the setting unit 21b becomes "1010". Then, in the central processing unit 13a of the left system, the setting value "0101" of the setting unit 21a is adopted as it is by the logical matching means 44a, whereas in the central processing unit 13b of the right system, the setting unit 21b is adopted by the logical matching means 44b. Since the set value "1010" of is inverted, the set value becomes "0101". After such inversion, since it is confirmed by comparison of the comparison means 32a and 32b that the set values of both systems match, the set state is correctly detected. Therefore, the above-mentioned digital time element relay 20 , 30, the output relay 18 operates properly in the same manner.

On the other hand, when a failure occurs in the coded switch 41, for example, when the terminal corresponding to the second bit from the bottom and the terminal corresponding to the third bit from the bottom are in a short-circuited state, the cause of such a short-circuit failure is that inside the switch. Since the bit values of both terminals are forced to be the same regardless of whether they are external to the switch, the set value of the coded switch 41 in which the short-circuit failure has occurred changes from "0101" to "0111" in this case. Further, for example, when the terminal corresponding to the second bit from the bottom becomes disconnected, the bit value of the corresponding terminal is fixed, and the set value of the coded switch 41 in which such an open failure occurs is changed from "0101" to "0001". become.

On the other hand, when a failure occurs in the coded switch 42, for example, when the terminal corresponding to the second bit from the bottom and the terminal corresponding to the third bit from the bottom are in a short-circuited state, the cause of such a short-circuit failure may be that inside the switch. Even if it is outside the switch, the bit values of both terminals are forced to be the same, so in this case, the set value of the coded switch 42 in which the short-circuit failure has occurred changes from "1010" to "1110". Further, for example, when the terminal corresponding to the second bit from the bottom becomes disconnected, the bit value of the corresponding terminal is fixed, but the set value of the coded switch 42 in which such an open failure occurs happens to be maintained at "1010". do. In the case of this failure, the failure is latent and the set value becomes an apparently normal value and does not cause an abnormal operation.

Therefore, to briefly describe with reference to the list of FIG. 6, when both the setting units 21a and 21b described above are normal (see the top row of the table) and when a failure is latent (see the center row of the table), the timekeeping is set. The processes of the means 13aa and 13ba and the timekeeping 13ab and 13bb are correctly executed, and the digital hourly relay 40 operates appropriately as a hourly relay and exhibits the desired function. On the other hand, when an open failure occurs in the coded switch 41 and a short-circuit failure occurs in the coded switch 42 (see the bottom row of the table), both set values after logical matching happen to match. No abnormality is detected, and the abnormality detection is entrusted to the collation means 16. Nonetheless, when other abnormalities occur, the abnormalities can be swiftly detected without waiting for the processing of the collation means 16, especially when the same failure such as both short failure or both open failure occurs in the coded switches 41 and 42. Detected.

Not limited to the above example, a modification thereof will be described (see FIG. 7). For example, when the resistance connection of the setting unit 21a is changed from the pull-down connection to the pull-up connection, the setting value of the setting unit 21a is negative logic “5”. When the resistance connection of the setting unit 21b is changed from the pull-down connection to the pull-up connection, the setting value of the setting unit 21b becomes "0101" when the positive logic is "5". Then, when the indicated values of the logical notification units 43a and 43b are changed to "negative" and "positive", respectively, in accordance with them, the setting value of the setting unit 21b is changed by the logical matching means 44b in the central processing unit 13b of the right system. While 0101 "is adopted as it is, in the central processing unit 13a of the left system, the set value" 1010 "of the setting unit 21a is inverted by the logical matching means 44a, and the set value becomes" 0101 ".

Then, although the complicated explanation that is repeated is omitted (see the list in FIG. 7), when both the setting units 21a and 21b are normal and when the open failure of the setting unit 21b is latent, the center of the left system. After the set value is inverted by the logical matching means 44a of the processing device 13a, the matching of the set values of both systems is confirmed by the comparison of the comparison means 32a and 32b, so that the set state is correctly detected and the above-mentioned digital time element is detected. The output relay 18 operates appropriately in the same manner as the relays 20 and 30. On the other hand, apart from the case where the coded switch 41 has an open failure and the coded switch 42 has a short failure, when other abnormalities occur, both the coded switches 41 and 42 have a short failure or both are open. The abnormality is promptly detected without waiting for the processing of the collating means 16, including the case where the same failure called a failure occurs.

Further, when the setting unit 21a is pulled down and the setting unit 21b is pulled up and the setting values of the setting units 21a and 21b are both positive logic "5" and become "0101" (see FIG. 8). Even when the setting unit 21a is pulled up and the setting unit 21b is pulled down and the setting values of the setting units 21a and 21b are both "5" and "1010" in negative logic (see FIG. 9). By setting both the indicated values of the logical notification units 43a and 43b to "positive" or "negative" in accordance with the above, in either case, the central processing devices 13a and 13b are used by the logical matching means 44a and 44b. The set value is also set to "0101" in positive logic.

Then, although the complicated explanation that is repeated is omitted (see the list of FIGS. 8 and 9), when the setting units 21a and 21b are both normal and when the open failure of the setting unit 21b becomes latent. Since the matching of the set values of both systems is confirmed by the comparison of the comparison means 32a and 32b, the set state is correctly detected, and the output relay 18 operates appropriately in the same manner as the above-mentioned digital time element relays 20 and 30. .. On the other hand, apart from the case where the coded switch 41 has an open failure and the coded switch 42 has a short failure, when other abnormalities occur, both the coded switches 41 and 42 have a short failure or both are open. The abnormality is promptly detected without waiting for the processing of the collating means 16, including when the same failure called a failure occurs.

The specific configuration of the fourth embodiment of the digital hourly relay of the present invention will be described with reference to the drawings. FIG. 10 is a block diagram showing the structure of the digital hourly relay 50.

The difference between the digital hourly relay 50 and the above-mentioned digital hourly relay 30 of the second embodiment is that the setting unit 21a of the left system includes the above-mentioned coded switch 41 in addition to the existing alternative type switch 22. The point that the right system setting unit 21b is provided with the above-mentioned code type switch 42 in addition to the existing alternative type switch 22 and the software of the left system central processing unit 13a are selective inversion means. The point that the comparison means 32a is expanded to become the comparison means 52a with the addition of the 51a, and the selective inversion means 51b is added to the software of the central processing unit 13b of the right system and the comparison means 32b is expanded. It is a point that the comparison means 52b is used.

The setting unit 21a can set a total of 40 values by combining the alternative type switch 22 and the code type switch 41, and the setting unit 21b is coded with the alternative type switch 22. By combining with the type switch 42, it is also possible to set a total of 40 values, and the variable range of the set values is greatly expanded in each case.
As for the coded switches 41 and 42 among these four switches, as described above, the coding in both switches 41 and 42 has complementarity for each corresponding terminal. Further, the resistance connection (*) of the coded switches 41 and 42 may be a pull-down connection or a pull-up connection for any of the switches.

On the other hand, for the alternative type switches 22 and 22 among these four switches, the setting unit 21a is made so that it is not necessary to attach the logic notification units 43a and 43b of the digital hourly relay 40 and the equivalent. Then, depending on whether the logic of the set value part after the resistance connection of the code type switch 41 is positive logic or negative logic, the resistance connection (#) of the alternative type switch 22 is changed to pull-down connection or pull-up connection. In the setting unit 21b, whether the resistance connection (#) of the alternative type switch 22 is a pull-down connection or a pull-up connection depending on whether the logic of the set value part after the resistance connection of the code type switch 42 is positive logic or negative logic. However, at that time, the relationship between the logical division and the resistance connection mode is matched for the setting units 21a and 21b of both systems.

Specifically, for example, the relationship between the logical division regarding the setting unit 21a and the resistance connection mode is such that the setting value portion related to the alternative type switch 22 among the setting values of the setting unit 21a is also a code among the setting values of the setting unit 21a. When the set value portion related to the type switch 41 is also positive logic, the relationship between the logic division regarding the setting unit 21b and the resistance connection mode also relates to the alternative type switch 22 among the set values of the setting unit 21b. The type of resistance connection is determined so that both the set value portion and the set value portion related to the coded switch 42 among the set values of the setting unit 21b are positive logic.

Further, for example, the relationship between the logic division regarding the setting unit 21a and the resistance connection mode is such that the setting value portion related to the alternative type switch 22 among the setting values of the setting unit 21a becomes positive logic, and among the setting values of the setting unit 21a. When the setting value portion related to the code type switch 41 has negative logic, the relationship between the logic division regarding the setting unit 21b and the resistance connection mode is also the setting value related to the alternative type switch 22 among the setting values of the setting unit 21b. The type of resistance connection is determined so that the portion becomes positive logic and the set value portion related to the code type switch 42 among the set values of the setting unit 21b becomes negative logic.

The selective inversion means 51a inverts the logical matching means 31a with respect to the portion corresponding to the coded switch 41 of the setting unit 21a among the set values of the setting unit 21a based on the relationship between the above-mentioned logical division and the resistance connection mode. Inversion processing is selectively performed according to the processing, and the selective inversion means 51b is also a coded switch among the set values of the setting unit 21b based on the relationship between the above-mentioned logical division and the resistance connection mode. The portion corresponding to 42 is selectively inverted according to the inversion process of the logical matching means 31b.

The comparison means 52a and 52b are all extensions of the comparison means 32a and 32b so that the set values having a large number of bits can be compared with each other. The set value portion passed from 31b and the set value portion passed from the selective inversion means 51a and 51b of the own system are combined to form a set value having a large number of bits, which is to be compared with each other. It has become like.

In such a digital hourly relay 50, the possible values of the setting values of the setting units 21a and 21b are expanded to a maximum of 40, so that the setting values of the hourly elements can be finely switched.
Further, the selection of the inversion process for the set value portion of the code type switches 41 and 42, which is difficult to discriminate between positive logic and negative logic by itself, uses the set value portion of the alternative type switches 22 and 22 which can be logically discriminated by itself. By making it possible to do this, it is possible to properly invert the entire set value without adding logical notification units 43a, 43b, etc., and not only the program code of both systems but also detailed programs. It is also easy to match the execution state (process) between both systems.

The specific configuration of the fifth embodiment of the digital hourly relay of the present invention will be described with reference to the drawings. FIG. 11 is a block diagram showing the structure of the digital hourly relay 60.
The difference between the digital time element relay 60 and the above-mentioned digital hour element relay 50 is that, in short, the relationship between the logical division of the setting units 21a and 21b and the resistance connection mode is limited to a specific one, so that the logical matching means is used. It means that neither 31a, 31b nor the selective inversion means 51a, 51b are needed and have been deleted from the central processing units 13a, 13b.

More specifically, the resistance connection of the alternative type switch 22 is a pull-down connection (PD) in both the setting units 21a and 21b, and the resistance connection of the "real type" coded switch 41 of the setting unit 21a is also made. Although it is a pull-down connection (PD), the resistance connection of the "complementary" type coded switch 42 of the setting unit 21b is a pull-up connection (PU).
As a result, neither the setting value of the setting unit 21a nor the setting value of the setting unit 21b needs to be inverted because all the bits become positive logic when they are input to the central processing units 13a and 13b.

With the deletion of the logical matching means 31a and 31b and the selective inversion means 51a and 51b, the portion of the set value of the setting unit 21a related to the alternative type switch 22 is sent to the rationality diagnosis means 23a and is sent to the setting unit. Of the set values of 21a, the portion related to the code type switch 41 is sent to the comparison means 52a, and the portion of the set values of the setting unit 21b related to the alternative type switch 22 is sent to the rationality diagnosis means 23b, and the portion related to the rational diagnosis means 23b is sent to the setting unit 21b. Of the set values of, the portion related to the coded switch 42 is sent to the comparison means 52b.

[others]
In all of the above embodiments, the central processing unit and the setting unit are dual systems, but the application of the present invention is not limited to the dual system, and the present invention corresponds to the above dual system. The present invention can be applied to a multi-system having a triple system or more as long as it contains a portion.
In the above Examples 2, 3 and 4, the logical matching means can selectively execute the inversion while ensuring the identity of the software, but the collation means 16 strictly executes the software up to the detailed execution step. In the case of checking, it is preferable to avoid excessive collation by temporarily stopping the operation of the collation means 16 while the logical matching means is being executed.

The digital hourly relay of the present invention is suitable for a slow-moving element type digital hourly element relay that can set a slow-moving element, but its application is not limited, and a slow-moving element is set. It can also be applied to a digital hourly relay that can set a slow release time element and a digital hourly element relay that can set a slow release time element in addition to a slow movement time element.

10 ... Digital time relay,
11 ... control input circuit, 12 ... power supply circuit,
13a, 13b ... Central processing unit (MPU),
13aa, 13ba ... Time element setting means, 13ab, 13bb ... Timekeeping means,
14a, 14b ... oscillator, 15a, 15b ... setting unit,
16 ... collation means, 17 ... relay drive unit, 18 ... output relay 20 ... digital time relay,
21a, 21b ... Setting unit, 22 ... Alternative switch, 23a, 23b ... Rationality diagnostic means,
30 ... Digital time relay,
31a, 31b ... Logical matching means, 32a, 32b ... Comparison means,
40 ... Digital time relay,
41 ... Coded switch (actually coded, real type),
42 ... Coded switch (complementary coded type, complementary type),
44a, 44b ... Logical matching means,
50 ... Digital time relay,
51a, 51b ... Selective inversion means, 52a, 52b ... Comparison means,
60 ... Digital time relay

Claims (11)

The first setting unit equipped with the first mechanical switch for setting the hour element, the first hour element setting means for setting the hour element based on the set value, and the first measuring the elapsed time based on the set hour element. A first central processing unit equipped with a timekeeping means, a second setting unit provided with a second mechanical switch for setting a time element, a second hour element setting means for setting a time element based on the set value, and the second setting unit thereof. A collation to check the identity between the processing of the first central processing unit and the processing of the second central processing unit with the second central processing unit provided with the second timekeeping means for measuring the elapsed time based on the set time element. In a digital timekeeping relay provided with a means and a relay drive unit that selectively drives an output relay according to the confirmation result of its identity.
Both the first mechanical switch and the second mechanical switch are provided with a plurality of terminals selected according to a switching operation, and any one of the plurality of terminals is selected in any of the switching states. It is an alternative switch, and whether the first central processing device is a value in an alternative state that can be set by the switching operation of the first mechanical switch with respect to the set value of the first setting unit, or another logical value. It is equipped with a rationality diagnostic means for investigating whether or not it exists, and the second central processing device is a value in an alternative state that can be set by the switching operation of the second mechanical switch with respect to the set value of the second setting unit. It is equipped with a rationality diagnostic means to check whether it exists or is another logical value .
A digital time element relay, characterized in that the drive of the output relay is suppressed when it is diagnosed that any of these rationality diagnostic means is not a value in the alternative state. Both the first mechanical switch and the second mechanical switch have three or more terminals that are switched according to the switching operation and are selected correspondingly.
Both the first central processing unit and the second central processing unit make a logical determination as to whether each of the set values corresponds to a positive logic or a negative logic, and perform inversion processing when the logics are different. The digital time element relay according to claim 1, further comprising a logic matching means for unifying the logic. Both the first central processing unit and the second central processing unit correspond to each of the set values after the execution of the logical matching means and before the time element is set by the respective time element setting means. The digital time element relay according to claim 2, wherein the objects are compared with each other. The first setting unit equipped with the first mechanical switch for setting the hour element, the first hour element setting means for setting the hour element based on the set value, and the first measuring the elapsed time based on the set hour element. A first central processing unit equipped with a timekeeping means, a second setting unit provided with a second mechanical switch for setting a time element, a second hour element setting means for setting a time element based on the set value, and the second setting unit thereof. A collation to check the identity between the processing of the first central processing unit and the processing of the second central processing unit with the second central processing unit provided with the second timekeeping means for measuring the elapsed time based on the set time element. In a digital timekeeping relay provided with a means and a relay drive unit that selectively drives an output relay according to the confirmation result of its identity.
The first mechanical switch and the second mechanical switch both have a plurality of terminals selected according to the switching operation, and coincide with those in which the selected state and the switching state of those terminals are encoded. A digital time element relay, which is a code-type switch for making a switch, wherein the coding in the first mechanical switch and the coding in the second mechanical switch have complementarity for each corresponding terminal. Both the first central processing unit and the second central processing unit compare the set values corresponding to each of the set values before setting the time element by the respective time element setting means. The digital time element relay according to claim 4, wherein the digital time relay is provided. Both the first central processing unit and the second central processing unit make a logical determination as to whether each of the set values corresponds to a positive logic or a negative logic, and perform inversion processing when the logics are different. The digital time element relay according to claim 5, further comprising a logic matching means for unifying the logic. Both the first central processing unit and the second central processing unit are provided with a logic notification unit that indicates whether the set value of each of the setting units corresponds to positive logic or negative logic. The digital time element relay according to claim 6, characterized in that. The first setting unit equipped with the first mechanical switch for setting the hour element, the first hour element setting means for setting the hour element based on the set value, and the first measuring the elapsed time based on the set hour element. A first central processing unit equipped with a timekeeping means, a second setting unit provided with a second mechanical switch for setting a time element, a second hour element setting means for setting a time element based on the set value, and the second setting unit thereof. A collation to check the identity between the processing of the first central processing unit and the processing of the second central processing unit with the second central processing unit provided with the second timekeeping means for measuring the elapsed time based on the set time element. In a digital timekeeping relay provided with a means and a relay drive unit that selectively drives an output relay according to the confirmation result of its identity.
Both the first mechanical switch and the second mechanical switch are provided with a plurality of terminals selected according to a switching operation, and any one of the plurality of terminals is selected in any of the switching states. It is a combination of an alternative switch and a coded switch that has multiple terminals that are selected according to the switching operation and that matches the selected state of those terminals with the encoded switching state. ,
The coding in the coded switch of the first mechanical switch and the coding in the coded switch of the second mechanical switch have complementarity for each corresponding terminal.
The value of the alternative state that can be set by the first central processing apparatus by the switching operation of the first mechanical switch for the portion related to the alternative type switch of the first mechanical switch among the set values of the first setting unit. It is provided with a rationality diagnostic means for investigating whether it is a logical value or another logical value, and the second central processing apparatus is an alternative switch of the second mechanical switch among the set values of the second setting unit. It is equipped with a rationality diagnostic means for investigating whether the part related to the above is a value in an alternative state that can be set by the switching operation of the second mechanical switch or another logical value .
A digital time element relay, characterized in that the drive of the output relay is suppressed when it is diagnosed that any of these rationality diagnostic means is not a value in the alternative state. The alternative switch of the first mechanical switch and the alternative switch of the second mechanical switch are both switched according to the switching operation, and the switching state is selected accordingly. Has more than one,
When both the first central processing unit and the second central processing unit make a logical determination as to whether the part corresponding to each alternative type switch of the set values is positive logic or negative logic, and the logics are different. The digital time element relay according to claim 8, further comprising a logic matching means for unifying the logic by performing inversion processing. Of the set values of the first setting unit, the logic of whether the logic is positive or negative with respect to the portion related to the alternative type switch of the first mechanical switch, and the code of the first mechanical switch among the set values of the first setting unit. Correspondence between the logic of positive logic or negative logic related to the part related to the type switch, and whether it is positive logic or negative logic related to the part related to the alternative type switch of the second mechanical switch among the set values of the second setting unit. The correspondence between the logic of the above and the logic of the positive logic or the negative logic regarding the part related to the code type switch of the second mechanical switch among the setting values of the second setting unit is the same.
Both the first central processing unit and the second central processing unit selectively invert the set values corresponding to the respective coded switches based on the logical determination of the logical matching means. The digital time element relay according to claim 9, further comprising means. Both the first central processing unit and the second central processing unit correspond to each of the set values after the execution of the selective inversion means and before the time element is set by the respective time element setting means. The digital time element relay according to claim 10, wherein the CPUs are designed to be compared with each other.

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