JP2002142240A - Private exchange device and its program managing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a private exchange device for unifying program versions and efficiently managing a program at the time of setting up the device by automatically updating a main CPU program and a sub-CPU program to the program of the latest version. SOLUTION: The device is provided with a main control unit 2 having a main CPU 3, a main program memory 4, a program down load I/F 5, and a bus mediation control unit 6 and sub-control units Ua1 to Uan. The program version of the whole device is matched by updating the main CPU program and the sub-CPU program of the latest version based on main CPU program version information and sub-CPU program version information, and the program is efficiently managed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a private branch exchange which ensures consistency based on program version information of a main CPU program of a main control unit and a sub CPU program of a sub control unit, and a program management method therefor.

[0002]

2. Description of the Related Art A conventional private branch exchange is known which is configured to individually manage a program of a main CPU mounted on a main control unit and a program of a sub CPU mounted on a sub control unit.

[0003] In such a conventional private branch exchange, when the program of the main CPU and the program of the sub CPU are matched, the program memory is manually replaced by a person in charge.

Also, in order to match the program versions of sub CPUs having the same function mounted on a plurality of sub control units, the program memory has been manually replaced by a person in charge.

[0005]

In the conventional private branch exchange, the program version of the main CPU mounted on the main control unit and the program of the sub CPU mounted on the sub control unit are matched. If not, a problem may occur due to mismatch of program versions when setting up the private branch exchange.

[0006] Such a problem is solved by performing a program memory replacement operation for ensuring the consistency between the main CPU and the sub CPU. However, when the number of sub control units is large, the program memory to be replaced is not required. There is a problem that the number of replacements increases and a huge amount of time is required for replacement work.

[0007] Further, there is a possibility that the replacement work becomes complicated and the setup of the private branch exchange apparatus cannot be completed within a scheduled period.

In order to solve such a problem, Japanese Patent Laid-Open No.
In Japanese Patent Application Laid-Open No. 6-169480, a program for a main CPU and a program for a sub CPU of a sub control unit including a plurality of sub CPUs are stored in advance in a program memory of a main control unit.
A private branch exchange device for downloading the above program to a program memory provided in a sub control unit is disclosed.

In the private branch exchange constructed as described above, only by replacing the program memory of the main control unit, the program of the sub CPU mounted on the sub control unit is automatically updated, and the version consistency of the program is maintained. Can be secured.

However, the private branch exchange disclosed in Japanese Patent Application Laid-Open No. 06-169480 discloses a private branch exchange which is mounted on a sub control unit in a program memory of a main control unit.
Due to the configuration in which the PU program is also stored, when there are many types of sub-control units and the number of programs of the sub-CPU is large, there is a new problem that the program memory capacity of the main control unit becomes very large.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to update a main CPU program and a sub CPU program used in a private branch exchange and external equipment connected to the private branch exchange. By automatically updating to a version of the program,
It is an object of the present invention to provide a private branch exchange apparatus capable of unifying program versions at the time of apparatus setup and performing efficient program management, and a program management method thereof.

[0012]

A private branch exchange according to the present invention includes a bus arbitration control unit in a main control unit, and a main CPU program in a main program memory based on program version information. One or both of the sub-programs in the sub-CPU program memory are updated.

The private branch exchange according to the present invention includes a bus arbitration control unit that updates one or both of the main CPU program in the main program memory and the sub CPU program in the subprogram memory based on the program version information. , The main CPU program and the sub CPU program can be automatically updated to the latest version, and the program versions can be unified to realize efficient program management.

A sub-control unit of the private branch exchange according to the present invention comprises a plurality of sub-control units each having a sub-CPU having the same function.

A private branch exchange according to the present invention comprises a plurality of sub-control units of sub-CPUs having the same function,
The bus arbitration control unit reads out the program version information of each sub-program memory of the sub-CPU, selects the latest program version information from among them, and uses the sub-CPU program of the sub-program memory having the latest program version to store the remaining sub-program memories. Since the sub CPU programs are updated, the sub CPU programs of all sub control units can be unified to the latest version, and efficient program management can be realized.

Further, the sub-control unit of the private branch exchange according to the present invention is characterized by comprising a plurality of sub-CPUs having different functions.

The private branch exchange according to the present invention includes a plurality of sub-control units of sub-CPUs having different functions, and the bus arbitration control unit stores program version information in a sub-program memory for each sub-CPU having the same function. Read out, select the latest program version from among them, and update the sub CPU program in the remaining sub program memory with the sub CPU program in the sub program memory having the latest program version. The sub CPU program can be unified to the latest version for each group, and efficient program management can be realized.

The program version information according to the present invention is the latest sub CPU program version information of the sub control unit.

Since the program version information according to the present invention is the latest sub-CPU program version information of the sub-control unit, the sub-CP
U, the latest version of the sub CPU program can be specified.
By updating the U program to the latest version, efficient program management can be realized.

Further, the program version information according to the present invention includes the latest main CPU program version information of the external equipment connected to the private branch exchange and the sub C
It is PU program version information.

Since the program version information according to the present invention is the latest main CPU program version information and sub CPU program version information of the external device connected to the private branch exchange, the external device has the latest version of the main CPU program and sub CPU program version information. If the CPU program is installed, the main CPU program of the main control unit of the private branch exchange and the sub CPU program of the sub control unit are updated to the latest version of the main CPU program and the sub CPU program installed in the external device. It is possible to ensure the version consistency and realize efficient program management.

The program management method for a private branch exchange according to the present invention is characterized in that the main CPU program version information of the main control unit and the sub CP
Step 1 for storing U program version information;
Step 2 for reading the main CPU program version information and sub CPU program version information of the external device, and Step 3 for comparing the stored program version information with the read program version information.
If the read program version information is newer than the stored program version information, the main CPU program of the main control unit and the sub CPU program of the sub control unit are replaced with the main CPU program of the external device.
And step 4 for updating the program and the sub CPU program to manage the program.

A program management method for a private branch exchange according to the present invention includes a main CPU program version information and a sub CPU program version information of an external device, and a main CPU of a main control unit and a sub control unit mounted on the private branch exchange. The program version information and the sub CPU program version information are compared, and if the main CPU program version information and the sub CPU program version information of the external device are newer than the main CPU program version information and the sub CPU program version information, the main The main CPU program of the control unit and the sub CPU program of the sub-control unit
Since the program is updated, the main CP of the private branch exchange
The U program and the sub CPU program can always be updated to the latest version to realize efficient program management.

Also, the program management method for a private branch exchange according to the present invention comprises a plurality of sub-control units,
When the sub CPUs having the same functions are provided, prior to step 1, the sub CPU program version information of each sub control unit is read, and sub step 1 for selecting the latest sub CPU program version information, and Sub-step 2 of updating the sub CPU program of the sub control unit with the sub CPU program of the sub control unit having the latest sub CPU program version information.

A program management method for a private branch exchange according to the present invention reads out sub-CPU program version information of a sub-control unit, selects the latest sub-CPU program version information, and executes sub-CPU programs of other sub-control units. Since the sub-CPU programs of the sub-control units having the latest sub-CPU program version information are updated, the sub-CPU programs of all the sub-control units can be unified with the latest version and efficiently managed.

[0026]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram of a main part of an embodiment of a private branch exchange according to the present invention. Note that the present embodiment has a plurality of sub-control units having the same function. In FIG. 1, the private branch exchange 1
It includes a main control unit 2 and sub-control units Ua1 to Uan, and accommodates TEL-a1 to TEL-an constituting external devices (for example, key telephones) 7 via extensions L11 to L1n.

The main control unit 2 includes a main CPU
3, a main program memory 4, a program download I / F 5, a bus arbitration control unit 6, and operation control of the entire private branch exchange 1 including the sub-control units Ua1 to Uan;
It manages and controls the operation of TEL-a1 to TEL-an, which are external devices 7.

The main CPU 3 performs various calculations and processes in accordance with the main CPU program PM supplied from the main program memory 4, so that the private branch exchange 1
To realize various functions.

The main program memory 4 is composed of a memory such as a rewritable RAM, and a main CPU program PM and a main CP
The U program version information JM is stored.

The program download I / F 5 has a program download interface function. Under the control of the bus arbitration control unit 6, the main control unit 2, the sub control units Ua1 to Uan, and the TEL-
An interface for downloading the main CPU program version information and the main CPU program or the sub CPU program version information and the sub CPU program mounted on a1 to TEL-an is executed.

The bus arbitration control unit 6 includes a rewritable RAM.
And the like, and a comparison / judgment function, and main CPU program version information JM in the main program memory 4.
Is stored.

The bus arbitration control unit 6 reads the sub CPU program version information JSa1 to JSan in the subprogram memories Ma1 to Man of the subcontrol units Ua1 to Uan, compares them, and compares them with the latest version information (for example, The unit Uak stores the sub CPU program version information JSak.

Subsequently, the bus arbitration controller 6 sets the main CP
With the control operation of U3 and program download I / F5, the latest sub CPU program version information J
The sub CPU program PSak is read from the subprogram memory Mak of the sub control unit Uak having Sak,
All sub control units U except sub control unit Uak
Download to a1 to Uak-1, Uak + 1 to Uan and sub CP
The U programs PSa1 to PSan are updated. Further, all the sub control units Ua1 to Uak-1 and Uak + 1 to Uan are connected to the sub CP
Update to U program version information JSak.

Further, the bus arbitration control unit 6 includes an external device 7
Main CPU program version information Jma1 to Jman and sub CPU in an external device program memory (not shown) mounted on each of TEL-a1 to TEL-an.
The program version information Jsa1 to Jsan are read and compared, and the main CPU program version information Jmak and the sub CPU program version information Jsak (TEL-ak of the external device 7) are determined as the latest version information.

Further, the bus arbitration control unit 6 stores the main C which is the latest version of the determined external device program memory.
PU program version information Jmak and sub CPU
The program version information Jsak is compared with the main CPU program version information JM and the sub CPU program version information JSak already stored, and the main CPU program version information Jmak and sub CPU program version information Jsak of the external device are already stored. Main CPU program version information J
If the version is newer than M and the sub CPU program version information JSak, the main CP
The U program version information Jmak and the sub CPU program version information Jsak are updated and stored.

Then, the bus arbitration control unit 6 sets the main CP
With the control operation of U3 and the program download I / F5, the main CPU program is stored in the external device program memory of the external device 7 (TEL-ak) having the latest main CPU program version information Jmak and the latest sub CPU program version information Jsak. Pmak and the sub CPU program Psak are read, and the main program memory 4 of the main control unit 2 is read from the main CPU.
The sub-control units Ua1 to Uan are updated with the program version information Jmak and the main CPU program Pmak.
Are updated with the sub CPU program version information Jsak and the sub CPU program Psak.

The sub control units Ua1 to Uan have sub CPUs x1 to xn and subprogram memories Ma1 to Man, respectively. The sub-program memories Ma1 to Man store sub-CPU program version information JSa1 to JSan and subprograms PSa1 to PSan, respectively.

The external device 7 is, for example, a key telephone TEL.
-A1 to TEL-an, with extensions L11 to L1n, respectively.
Is connected to the private branch exchange apparatus 1 via the. Each of the key telephones TEL-a1 to TEL-an has an external program memory (not shown), and each of the external memory programs includes main CPU program version information Jma1 to Jman, main CPU programs Pma1 to Pman,
The sub CPU program version information Jsa1 to Jsan and the sub CPU program Psa1 to Psan are stored.

As described above, the private branch exchange 1 according to the present invention uses the main CPU program PM in the main program memory 4 and the sub CPU programs PSa in the subprogram memories Ma1 to Man based on the program version information.
Since the bus arbitration control unit 6 for updating any one or both of 1 to PSan is provided, the main CPU program PM and the sub CPU programs PSa1 to PSan can be automatically updated to the latest versions Pmak and Psak. Efficient program management can be realized by unifying versions.

The private branch exchange 1 according to the present invention comprises:
Even if a plurality of sub-control units Ua1 to Uan of the sub-CPUs x1 to xn having the same function are provided, the bus arbitration control unit 6 controls the sub-program memories Ma1 to Ma of the sub-CPUs x1 to xn, respectively.
Read out the program version information JSa1 to JSan of Man, and from this read out the latest program version information JSak
(For example, in the case of the sub control unit Uak), and the remaining sub program memories Ma1 to Mak-1 and the sub CPU programs PS1 to PSak of Mak to Man are replaced by the sub CPU programs PSak of the subprogram memory Mak having the latest program version. Since -1, PSak + 1 to PSan are updated, the sub CPU programs PSa1 to PSan of all the sub control units Ua1 to Uan can be unified to the latest version, and efficient program management can be realized.

In the present embodiment, a plurality of sub-control units Ua1 to Uan having the same function are provided, and each of the sub-control units Ua1 to Uan is provided with the TEL-
Although the private branch exchange in which a1 to TEL-an are connected via extensions L11 to L1n has been described, the present invention can be similarly applied to a case where there is one sub-control unit and one external device 7. it can.

FIG. 2 is a block diagram showing a principal part of another embodiment of the private branch exchange according to the present invention. This embodiment has a plurality of sub-control units having different functions. In FIG. 2, the private branch exchange 11 includes a main control unit 2, sub-control units Ua1 to Uan, and Ub1 to Ubn.
And TEL- which constitutes external devices (eg, key telephones) 7 and 8 via extensions L11 to L1n and L21 to L2n.
a1 to TEL-an and TEL-b1 to TEL-bn are accommodated.

In FIG. 2, the main control unit 2, the sub control units Ua1 to Uan of the private branch exchange 11 and the TEL-a1 to TEL-an of the external equipment 7 are the same as those shown in FIG. Except for the operation of the second bus arbitration control unit 6, detailed description is omitted.

The bus arbitration control unit 6 includes a rewritable RAM.
And the like, and a comparison / judgment function, and main CPU program version information JM in the main program memory 4.
Is stored.

Further, the bus arbitration control unit 6 includes a sub-program memory M of the sub-control units Ua1 to Uan and Ub1 to Ubn.
The sub CPU program version information JSa1 to JSan and JSb1 to JSbn in a1 to Man and Mb1 to Mbn are read and compared to determine the latest version information, respectively (for example, in the case of the sub control units Uak and Ubk). The program version information JSak and JSbk are stored.

Subsequently, the bus arbitration control unit 6 sets the main CP
With the control operation of U3 and program download I / F5, the latest sub CPU program version information J
The sub CPU programs PSak and PSbk are read from the subprogram memories Mak and Mbk of the subcontrol units Uak and Ubk having Sak and JSbk, respectively, and the sub control units Uak and Ubk are read.
All sub-control units Ua1 to Uak-1, Uak + 1 to
Uan or Ub1 to Ubk-1, Ubk + 1 to Ubn, and sub CPU programs PSa1 to PSan or PSb1 to
Update PSbn. Also, all the sub control units Ua1
~ Uak-1, Uak + 1 ~ Uan or Ub1 ~ Ubk-1, Ubk + 1 ~
Ubn is updated with the sub CPU program version information JSak or JSbk.

Further, the bus arbitration control unit 6 includes an external device 7
TEL-a1 to TEL-an or TEL-
Main CPU program version information Jma1 to Jman, Jmb1 to Jmbn, and sub CPU program version information Jsa1 to Jsan, Jsb1 in external device program memories (not shown) mounted on each of b1 to TEL-bn.
~ Jsbn are read and compared, and as the latest version information, the main CPU program version information Jmak, Jm
bk, sub CPU program version information Jsak (TEL-ak of external device 7), Jsbk (TEL-b of external device 8)
j) is determined.

Further, the bus arbitration control unit 6 controls the main C which is the latest version of the determined external device program memory.
PU program version information Jmak, Jmbk, sub CPU program version information Jsak, Jsbk, main CPU program version information JM and sub CPU program version information JSak,
The main CPU program version information Jm and sub CPU program version information Jmak and Jmbk and the sub CPU program version information Jsak and Jsbk of the external device are compared.
If the version is newer than the U program version information JSak, JSbk, it is updated and stored as main CPU program version information Jmak, Jmbk and sub CPU program version information Jmak, Jmbk of the external device.

Then, the bus arbitration control unit 6 sets the main CP
The external device 7 (TEL-a) having the latest main CPU program version information Jmak, Jmbk and the latest sub CPU program version information Jsak, Jsbk together with the control operation of U3 and the program download I / F5.
k), the main CPU programs Pmak and Pmbk and the sub CPU programs Psak and Psbk are read from the external device program memory of the external device 8 (TEL-bk), and the main program memory 4 of the main control unit 2 is read from the main CP memory.
The U program version information Jmak, Jmbk and the main CPU programs Pmak, Pmbk are updated and the subprogram memories M of the sub control units Ua1 to Uan, Ub1 to Ubn are updated.
a1 to Man, Mb1 to Mbn are sub CPU program version information Jsak, Jsbk and sub CPU program Psa
Update with k, Psbk.

The bus arbitration control unit 6 includes the sub-control units Ua1 to Uan having the same function and the TEL of the external device 7.
-A1 to TEL-an, and after the update operation is completed, the sub-control units Ub1 to Ubn and the TEL
An update operation by a combination of -b1 to TEL-bn is started.

In this embodiment, a plurality of sub-control units Ua1 to Uan, Ub1 to Ubn of sub CPUs x1 to xn and y1 to yn having two different functions, and respective sub control units Ua1 to Uan, Ub1 ~ Ubn to TE of external devices 7 and 8
Although the private branch exchange to which L-a1 to TEL-an and TEL-b1 to TEL-bn are connected has been described, the present invention relates to a sub-control unit having a plurality of sub-CPUs each having three or more different functions. Alternatively, the present invention can be similarly applied to the case of a sub-control unit having one or two sub-CPUs having different functions.

As described above, the private branch exchange 11 according to the present invention has sub CPUs x1 to xn and y1 to yn having different functions.
And a plurality of sub-control units Ua1 to Uan and Ub1 to Ubn.
For each of x1 to xn and y1 to yn, subprogram memories Ma1 to Ma
n, Mb1 to Mbn program version information JSa1 to JSa
n, JSb1 to JSbn are read, and the latest program version is selected from them, and the latest program version JSa
Since the sub CPU programs of the remaining sub program memories are updated by the sub CPU programs PSak and PSbk of the sub program memories Mak and Mbk having the sub CPUs k and JSbn, the sub CPUs for each group of sub control units having the sub CPUs having the same function The program can be unified to the latest version, and efficient program management can be realized.

The program version information according to the present invention is the latest sub CPU program version information JSak, JS of the sub control units Ua1 to Uan, Ub1 to Ubn.
bk, the sub CPUs x1 to xn,
y1-yn latest version of sub CPU program PSa
k and PSbk can be specified, so that the sub CPU programs PSa1 to PSan and PSb1 to PSbn of all the sub control units Ua1 to Uan and Ub1 to Ubn are updated to the latest version to realize efficient program management. Can be.

The program version information according to the present invention is stored in external devices 7 and 8 connected to private branch exchange 1.
Latest main CPU program version information Jma
k, Jmbk and sub CPU program version information J
Sak and JSbk, the latest versions of the main CPU programs Jmak and Jmbk and sub C
When the PU programs Jsak and Jsbk are installed, the main control unit 2 of the private branch exchange 1
PU program PM and sub-control units Ua1 to Ua
n, Ub1 to Ubn sub CPU programs PSa1 to PSan,
PSb1 to PSbn can be updated to the latest versions of the main CPU programs Pmak and Pmbk and the sub CPU programs Psak and Psbk mounted on the external devices 7 and 8,
Efficient program management can be realized by ensuring version consistency.

Next, a program management method for a private branch exchange according to the present invention will be described with reference to an operation flowchart. FIG. 3 is an operation flowchart of the program management method of the private branch exchange corresponding to FIG.

In FIG. 3, in sub-step SB1,
Sub CP of each sub control unit (Ua1 to Uan)
U program version information (JSa1 to JSan) is read, and the latest sub CPU program version information (JSa1) is read.
Select k).

Subsequently, in sub-step SB2, the sub-Cs of the other sub-control units (Ua1 to Uak-1, Uak + 1 to Uan)
PU program (PSa1 to PSak-1, PSak + 1 to PSan)
With the latest sub CPU program version information (JSa
(k) is updated by the sub CPU program (PSak) of the sub control unit (Uak).

Next, at step S1, the main CPU program version information (JM) of the main control unit 2 is obtained.
And the sub CPU program version information (JSak) of the sub control unit Uak.

In step S2, the main CP of the external device
The U program version information (Jma1 to Jman) and the sub CPU program version information (Jsa1 to Jsan) of the sub control unit are read, and the latest program version information (Jmak, Jsak) is selected.

In step S3, the stored program version information (JM, JSak) is compared with the read program version information (Jmak, Jsak).

In step S4, if the read program version information (Jmak, Jsak) is newer than the stored program version information (JM, JSak), the main CPU program (PM) of the main control unit and the sub CPU of the sub control unit Program (PSa1 ~
PSan) to the main CPU program (Pmak) of the external device
And the sub CPU program (Psak).

FIG. 4 shows program version information and CPU
FIG. 2 shows a configuration diagram of a program memory for storing a program.

As described above, the program management method for a private branch exchange according to the present invention always updates the main CPU program and the sub CPU program to the latest version, realizes version consistency, and realizes efficient program management. Can be.

[0064]

As described above, the private branch exchange according to the present invention updates one or both of the main CPU program in the main program memory and the sub CPU program in the subprogram memory based on the program version information. With a bus arbitration control unit,
The main CPU program and the sub CPU program can be automatically updated to the latest versions, and the program versions can be unified to realize efficient program management.

A program management method for a private branch exchange according to the present invention comprises a main CPU program and a sub CPU.
It is possible to always make the program the latest version, realize version consistency, and realize efficient program management.

[Brief description of the drawings]

FIG. 1 is a block diagram of a main part of a private branch exchange according to an embodiment of the present invention.

FIG. 2 is a block diagram of a principal part of another embodiment of the private branch exchange according to the present invention.

FIG. 3 is an operation flowchart of a program management method for a private branch exchange corresponding to FIG. 1;

FIG. 4 is a configuration diagram of a program memory for storing program version information and a CPU program.

[Explanation of symbols]

1, 11 private branch exchange 2 main control unit 3 main CPU 4 main program memory 5 program download I / F 6 bus arbitration control unit 7, 8 external device (TEL-a1 to TEL-an, TEL-
b1 to TEL-bn) Ua1 to Uan, Ub1 to Ubn Sub-control units Ma1 to Man, Mb1 to Mbn Subprogram memory JM, Jma1 to Jman Main CPU program version information JSa1 to JSan, Jsa1 to Jsan Sub CPU program version information PM, Pma1 to Pman Main CPU program PSa1 to PSak, Psa1 to Psan Sub CPU program

Claims (7)

[Claims] 1. A private branch exchange that includes a main control unit having a main CPU, a main program memory, and a program download I / F unit, and a sub control unit having a sub CPU and a sub program memory, and performs load distribution control. The main control unit includes a bus arbitration control unit, and updates one or both of a main CPU program of the main program memory and a sub CPU program of the subprogram memory based on program version information. Private branch exchange. 2. The private branch exchange according to claim 1, wherein the sub-control unit comprises a plurality of sub-CPUs, each having a sub-CPU having the same function. 3. The private branch exchange according to claim 1, wherein said sub control unit comprises a plurality of sub CPUs having different functions. 4. The private branch exchange according to claim 1, wherein the program version information is the latest sub CPU program version information of the sub control unit. 5. The apparatus according to claim 1, wherein the program version information is the latest main CPU program version information and sub CPU program version information of an external device connected to the sub control unit. The private branch exchange according to claim 3. 6. A private branch exchange that includes a main control unit having a main CPU, a main program memory, and a program download I / F unit, and a sub control unit having a sub CPU and a sub program memory, and performs load distribution control. A program management method for a private branch exchange, wherein the program is managed in the following steps. Step 1: Main CPU program version information of main control unit and sub CP of sub control unit
Stores U program version information. Step 2: Read out the main CPU program version information of the external device and the sub CPU program version information of the sub control unit. Step 3: Compare the stored program version information with the read program version information. Step 4: If the read program version information is newer than the stored program version information, the main CPU program of the main control unit and the sub CPU program of the sub control unit are updated to the main CPU program and the sub CPU program of the external device. 7. A sub-control unit comprising a plurality of sub-control units, each including a sub-CPU having the same function, the following sub-steps are provided prior to the step 1. A private branch exchange program management method. Sub-step 1: Sub-C of each sub-control unit
The PU program version information is read, and the latest sub CPU program version information is selected. Sub-step 2: The sub CPU program of another sub control unit is updated with the sub CPU program of the sub control unit having the latest sub CPU program version information.