JP2939666B2 - Bus failure judgment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus failure judging method in a system in which a plurality of packages are mounted and each package is connected by a bus. In general, various control devices and the like are configured by a plurality of units, each unit is configured by a plurality of packages, and the packages are generally connected by a bus such as a backboard. In such a configuration, it is demanded that a package can be inserted and removed so that a malfunction does not occur during system operation.

[0002]

2. Description of the Related Art FIG. 6 is an explanatory view of a conventional example, in which 31 is a package, 31a is a common processing unit package including a common processing unit in a unit, 32 is a bus, 33 is a mounting information line, 34
Is a unit, 35 is a common control unit, 36 is a mounting detection unit, 3
7, a package interface unit; and 38, a polling control unit. The unit 34 has a three-stage configuration, but may have a configuration with a larger number of units.

The common control unit 35 and each unit 34 are connected by respective buses 32, and a package 31 and a common processing unit package 31a are connected to the buses 32. The bus 32 includes, for example, a clock line, a command line, and a response line, and performs serial transmission. That is, the polling control unit 38 of the common control unit 35
, A clock signal is transmitted by a clock line, a polling signal is transmitted by a command line, and various data and the like are transmitted by a response line from the packages 31, 31a designated by the polling signal.

Whether the package 31 is mounted or not mounted is detected by the mounting detection unit 36 of the common processing unit package 31a via the mounting information line 33. For example, package 3
When 1 is not mounted, since, for example, +5 V is applied via a resistor, it becomes a detection signal indicating that “1” is not mounted. When the package 31 is mounted, the mounting information line 33 is grounded. Therefore, the detection signal indicates the mounting of “0”. Then, when the common processing unit package 31a is designated by the polling control unit 38 of the common control unit 35 by polling at a fixed period, the package 31 in the own unit is used.
The implementation information indicating the implementation and non-implementation of is transmitted serially through the response line.

FIG. 7 is an explanatory view of a conventional unit.
PKG1 to PKGn indicate packages corresponding to the packages 31 and 31a in FIG. 6, and are connected by a bus 32 to form a unit. Reference numerals 33-1 to 33-3 denote mounting information lines, reference numeral 40 denotes a gate circuit, and reference numeral 41 denotes a resistor connected to, for example, a + 5V power supply. The gate circuit 40 and the resistor 41 correspond to the mounting information lines 33-1 to 33-3. However, for simplicity, only the correspondence to the mounting information line 33-3 is shown. Reference numerals 42 and 43 denote bus drivers and bus receivers which constitute a part of the package interface unit. The package PKG2 indicated by the dotted line indicates that the package PKG2 is not mounted, and the package PKGn is the package 31 of FIG.
corresponds to a.

Since the packages PKG1 and PKG3 are mounted, the mounting information lines 33-1 and 33-3 are grounded via the packages PKG1 and PKG3, so that the output of the gate circuit 40 becomes "0". That is, the detection signal indicates the mounting. Further, since the package PKG2 is not mounted, the mounting information line 33-2 is not grounded, so that the output of the gate circuit 40 becomes "1". That is, it becomes a detection signal indicating that no mounting is performed. Package PKGn
Sends the mounting information indicating mounting or non-mounting of the packages PKG1 to PKGn-1 in the own unit to the bus 32 via the bus driver 42 when specified by polling.

[0007]

[Problems to be Solved by the Invention] Package PKG1
If PKGn are sequentially designated by polling, for example, package PKG1 responds and package PKG1
2, if the PKG 3 is not responding, the common control unit uses the package mounting information to determine whether there is no response due to non-mounting or no response due to a failure, and the package PKG 2 is not mounted. , It is determined that there is no failure. However, since the package PKG3 has no response despite being mounted, it is determined that the failure of the bus 32 or the failure of the control unit of the package PKG3.

In the above-described determination, there is a time lag between the determination as to whether or not there is a response and the determination as to whether the response is implemented or not because of the software processing. For example, as shown in FIG. 8, in the case of a detection signal of “1” when the package is not mounted and “0” when the package is mounted, control by polling is performed at time t1 and at time t2. If no response is determined and the package is mounted at time t3, the detection signal becomes "0". At time t4, mounting / non-mounting is determined based on the "0" detection signal. , There is no response, but the package is mounted, and therefore, it is determined that a failure of the bus or a failure of the control unit of the package has occurred. That is, when the package is inserted and removed during operation,
Even if the bus and the package are normal, there may be a case where a fault is erroneously determined to have occurred due to a shift in determination timing. SUMMARY OF THE INVENTION It is an object of the present invention to detect mounting and non-mounting after a predetermined time after a package is mounted, and to prevent erroneous determination due to a shift in determination timing.

[0009]

According to the bus failure judging method of the present invention, mounted packages 1-1 to 1-n are connected by a bus 2 to judge whether these packages are mounted or not, and to determine whether or not these packages are mounted. The package is sequentially specified by periodic polling, and when the package is in the mounted state but there is no response,
In a system for determining a bus failure or a package failure, the mounting detection signal that detects the mounting of the package includes:
A delay time longer than the polling cycle is given as mounting information for determining whether a package is mounted or not.

A plurality of units and a common control unit are provided. Each unit is constituted by connecting a plurality of packages and a common processing unit package in the unit by a bus, and the common control unit connects each package at a constant period. In a system that polls and sends the mounting information of the package in its own unit to the common control unit when the common processing unit package is specified, implements the presence or absence of the package in its own unit in the common processing unit package. A delay detecting means for detecting the mounting information via the information line and providing the mounting detection signal with a delay time longer than the polling cycle to provide mounting information; and mounting information delayed by the delay detecting means to a common control unit. When polling a package, there is no response due to non-implementation, or a path failure or a control system It is to determine whether non-response by harm.

[0011]

According to the present invention, the mounting detection signal obtained by mounting the package is delayed for a time longer than the polling cycle to obtain mounting information. In FIG. A case is shown in which response determination and mounting determination are performed by polling -1 to 1-n-1, and mounting determination is performed by a mounting detection signal via a mounting information line 3. The means for delaying the mounting detection signal is provided in each of the packages 1-1 to 1-n-1 or provided in the package 1-n for performing mounting determination. Therefore, if there is no response due to the polling immediately before the mounting of the package that has not been mounted, the mounting determination immediately after the polling is determined as not mounting because the mounting detection signal is delayed. That is, it is determined that there is no obstacle. Since a response can be made by subsequent polling, even if it is determined that the package is not mounted because the mounting detection signal is further delayed, if there is a response by polling, it is determined that there is no failure.

In a system composed of a plurality of units, a common processing unit package is mounted for each unit, and whether a package in the own unit is mounted or not mounted is detected, and polling from the common control unit is performed. When specified, it sends the implementation information in its own unit to the common control unit. At that time, a delay longer than the polling cycle is given to the mounting detection signal at the time of mounting the package in the own unit, so that there is a time lag between the response determination and the mounting determination in the common control unit. In addition, if the bus and the package are normal, it is not determined that there is no response in the mounted state, and malfunction can be prevented.

[0013]

FIG. 2 is an explanatory view of an embodiment of the present invention.
Is a package, 11a is a common processing unit package in the unit, 12 is a bus, 13 is a mounting information line, 14 is a unit, 15 is a common control unit, 16 is a mounting detection unit, 17 is a package interface unit, and 18 is polling control. Department. The mounting information line 13 indicates that the unit 11 is grounded by mounting the unit 11. The mounting information line 13 corresponding to the package 11 indicates whether the package 11 is grounded.
The mounting detection unit 16 detects whether or not this is mounted.

The bus 12 is composed of a clock line, a command line, and a response line, as in the conventional example, and can perform serial transfer.
1, 11a are connected to a bus 12 via a package interface unit 17, and a polling control unit 18 of a common control unit 15 is connected to a bus 12 corresponding to the unit 14. 14 and the polling control unit 18 of the common control unit 15.

The mounting detection signal when the package 11 is mounted is delayed by a delay circuit having a delay time longer than the polling period to become mounting information. A circuit or
Alternatively, a delay circuit can be provided between each package 11 and the mounting information line 13. Since this delay circuit obtains a delay time longer than the polling period, it is a relatively long delay circuit. For example, various configurations using a counter, a shift register, or the like can be used. Also, the packages 11, 11a in each unit 14 are periodically controlled by the polling control unit 18 of the common control unit 15.
Is polled, and the specified package 11, 1
Data is transmitted and received between 1a and the common control unit 15 via a response line of the bus 12.

The common processing unit package 11a is connected to the bus 12
Is specified by polling via the command line of FIG. 1, mounting information indicating whether the package 11 in the own unit is mounted or not mounted is shared by the mounting detecting unit 16 from the package interface unit 17 via the response line of the bus 12. Control unit 1
5 is sent. Therefore, when there is no bus failure, the common control unit 15 determines that the package 1
Even if 1 does not respond, the mounting determination is performed with a delay, so it is determined that the mounting is not performed at that time. Thereby,
It is determined that there is no obstacle.

FIGS. 3A and 3B are explanatory diagrams of the operation of the embodiment of the present invention. FIG. 3A shows the timing of inserting and removing a package, FIG. 3B shows mounting information (“1” = not mounted, “0” = mounted), and FIG. ) Indicates the polling period, (d) indicates the determination timing, and the time t
Even if the package is mounted on 1 and a mounting detection signal is immediately obtained, a delay time Td longer than the polling cycle Tp shown in (c) is given to obtain mounting information shown in (b). The determination timing indicates a case where there is a delay of Tx with respect to the polling timing.

For example, a package specified by polling immediately before time t1 does not respond because it is polled at the time of non-mounting, but it is assumed that mounting or non-mounting is determined immediately after time t1. When the mounting detection signal is used as it is as mounting information, since it has already been mounted, it is determined that the mounted package is not responding as in the above-described conventional example, and is determined to be a bus failure or a package failure. . On the other hand, in the present invention, since the mounting detection signal is given a delay of time Td in the relationship of Td> Tp, it is determined that there is no response even after it is determined that there is no response. Erroneous determination can be prevented.

When the package is removed at time t3, the mounting information immediately becomes "1" indicating non-mounting as shown in FIG. Therefore, when a package that has not been mounted is designated by polling immediately after time t3, no response is returned. However, in the mounting determination, it is determined that the package has not been mounted, and thus no failure is determined.

FIG. 4 is an explanatory view of the mounting detecting section according to the embodiment of the present invention, and shows a case where the mounting detecting section is provided in each package 11. In the figure, 21 is a power supply voltage detection circuit, 22 is a mono-multivibrator of inverted output, 23 is a NAND circuit, 24 is a resistor, 25 is a capacitor, and 26 is a mounting information line.

FIGS. 5A and 5B are explanatory diagrams of the operation of FIG. 4. FIG. 5A shows a package mounting timing, FIG. 5B shows a detection signal of the power supply voltage detecting circuit 21, and FIG.
(D) shows the output signal of the NAND circuit 23. When the package is mounted at time t1, it is connected to a power supply bus such as a backboard and a power supply voltage is applied in the package. The rise of the power supply voltage to a predetermined value is detected by the power supply voltage detection circuit 21. As shown in (b), for example, the detection signal becomes "1" at time t2.

The mono-multi vibrator 22 operates at time t2
Triggered by the rise of the detection signal of the power supply voltage detection circuit 21 in (2), the output signal becomes "0" for a set time as shown in (c). The resistor 24 and the capacitor 25 constitute a delay circuit for delaying the detection signal of the power supply voltage detection circuit 21 by a time slightly longer than the operation delay time of the monomultivibrator 22. The mono-multi vibrator 22 is activated at a set time after being triggered.
The output signal becomes "1", and the output signal of the NAND circuit 23 becomes "0" as shown in FIG. That is, the mounting detection signal can be set to “0” after a time Td (> Tp) from mounting the package. When the package is removed, the detection signal of the power supply voltage detection circuit 21 immediately becomes "0". Therefore, after a slight delay due to the resistor 24 and the capacitor 25, the output signal of the NAND circuit 23 becomes "1", and the unmounted state is determined. Can be shown.

In this mounting detection circuit, the time Td from the time of mounting the package to the time when a detection signal indicating mounting is obtained is obtained by the sum of the rise time of the power supply voltage and the set time of the mono-multivibrator 22. However, it is also possible to use other delay means, for example, the bus 1
It is also possible to count the clock signals of the two clock lines and output a detection signal indicating that "0" is mounted when the count becomes equivalent to the desired time Td.

[0024]

As described above, according to the present invention, the mounting detection signal for detecting the mounting of a package is given a delay time longer than the polling cycle, and is used as mounting information for determining whether the package is mounted or not mounted. Response to polling, determination of no response, package implementation,
If there is no failure in the bus and the package even if the judgment of the non-mounting is shifted in time, the case of no response is only the case of the non-mounting. Therefore, when it is determined that there is no response and the implementation is performed, it is determined that there is a bus failure or that there is a package failure. In other words, there is an advantage that erroneous determination can be reliably prevented even when a package is added regardless of the polling timing during operation.

In a system composed of a plurality of units, a common processing unit package corresponding to the unit collects mounting information indicating whether or not the package in the own unit is mounted, and polling from the common control unit. However, even in this case, in each common processing unit package, the mounting detection signal at the time of mounting the package in the own unit is delayed by a time longer than the polling cycle. By using the information, in the case of no bus failure and no package failure, the common control unit determines that there is no response only when it is determined that the package has not been mounted. The determination can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is an explanatory diagram of an embodiment of the present invention.

FIG. 3 is an operation explanatory diagram of the embodiment of the present invention.

FIG. 4 is an explanatory diagram of a mounting detection unit according to the embodiment of the present invention.

FIG. 5 is an operation explanatory diagram of FIG. 4;

FIG. 6 is an explanatory diagram of a conventional example.

FIG. 7 is an explanatory diagram of a conventional unit.

FIG. 8 is an explanatory diagram of a judgment of mounting / non-mounting in the conventional example.

[Explanation of symbols]

 1-1 to 1-n package 2 bus 3 mounting information line

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04L 12/40 H04L 25/02 301 H04L 29/00

Claims (2)

(57) [Claims] A package (1-1 to 1-
n) by a bus (2), and mounting of the package,
In a system in which it is determined that the package is not mounted, and the packages are sequentially designated by polling at a fixed cycle, and when the package is in a mounted state and there is no response, it is determined that the bus has failed or the package has failed. A bus failure determination method, wherein a delay time longer than the polling cycle is given to the detected mounting detection signal to provide mounting information for determining whether the package is mounted or not mounted. 2. A unit having a plurality of packages and a common processing unit package in the unit mounted thereon and connected by a bus, and a common control unit for monitoring and controlling the plurality of units, wherein a fixed number of units are provided from the common control unit. In a system that polls each of the packages in a cycle and sends out the mounting information of the package in its own unit to the common control unit when the common processing unit package is designated, the common processing unit package has its own unit. Detecting whether or not the package is mounted via a mounting information line, providing a mounting detection signal with a delay time longer than the polling cycle and providing mounting information as delay information; The polling of the package is sent to the common control unit, and the polling of the package is performed. A bus failure determination method for determining whether a response has occurred or whether there is no response due to a bus failure during mounting or a failure in a control system.