JPH10255871A - Branching connector and cable routing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct addition of a power supply line completely with a simple work in a branching connector. SOLUTION: In this branching connector 30, under a condition where a main cable 5 including power supply lines 5a, 5b and signal lines 5c, 5d, a branched cable 6 including power supply lines 6a, 6b and signal lines 6c, 6d, and power supply lines 20a, 20b inserted additionally are fitted, the signal lines 6c, 6d of the branched cable 6 are connected to the signal lines 5c, 5d of the main cable 5, and the power supply lines 20a, 20b inserted additionally are connected to the power supply lines 6a, 6b of the main cable 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch connector used for branching a cable and a cable arranging system.

[0002]

2. Description of the Related Art The present applicant has applied a so-called factory automation system (hereinafter referred to as FA) for supplying power and transmitting and receiving signals between a master station and a plurality of slave stations.
System). This FA system is shown in FIG.

[0003] In the figure, 1 is the power supply, 2 is the master station, 3 pair of power lines connected to the master station 2 is derived from the power supply 1, 4 ₁
4 _N plurality of slave stations, backbone cable as branch source cable 5 is derived from the master station 2, the branch line cable as a branch destination cable 6 connects the and each slave station 4 ₁ to 4 _N backbone cable 5 Reference numerals 7 indicate branching connectors provided at the connection portions between the main cable 5 and the branch cable 6. As described above, the plurality of slave stations 4 are provided at a plurality of locations in the longitudinal direction of the trunk cable 5.
₁ to 4 _N are connected via a branching connector 7 and a branch cable 6, respectively.

The backbone cable 5 and the branch cable 6 are, for example, two power lines 5a, 5b, 6 respectively.
a, 6b at both ends and two signal lines 5c, 5d, 6
This is what is called a so-called multi-core flat cable in which c and 6d are arranged in the middle and one row in parallel.

The branching connector 7 is described in detail in, for example, the specification attached to Japanese Patent Application No. 7-31820. As shown in FIG. And two covers 9A and 9B. The contact block 8 includes an engagement lock 10 on a substantially square plate and four terminals 11 penetrating on both upper and lower surfaces.
a to 11d, and two covers 9A and 9B
Are press-fitted separately on the upper and lower surfaces. Two covers 9
A, 9B are two holding plates 12A, 12B, 13A, 1
3B are provided with positioning grooves 14A, 14B, 15A, 15B, locking pieces 16A, 16B, engaging holes 17A, 17B, and the like, which are mounted on the middle of the main cable 5 and on the edge of the branch cable 6, respectively. Contact block 8
When the two covers 9A and 9B are press-fitted to the main cable 5, the two power lines 6a and 6b of the branch cable 6 are connected to the two power lines 5a and 5b of the main cable 5, and The two signal lines 6c and 6d of the branch cable 6 are respectively connected to the two signal lines 5c and 5d.

In the above-described system, the longer the trunk cable 5, the greater the transmission loss. Therefore, in some cases, the transmission loss to the slave stations (4 ₁ to 4 _N ) connected to a position far from the master station 2 may be increased. The supply voltage will be insufficient.

In such a case, for example, as shown in FIG. 12, a relay terminal block 18 is provided in the middle of the trunk cable 5, and a power supply 19 different from the power supply 1 is additionally connected via the relay terminal block 18. Can be considered.

More specifically, first, the trunk cable 5 is cut, the cut portions of the pair of power supply lines 5a and 5b in the trunk cable 5 upstream of the cutting position are insulated, and the upstream of the cutting position is cut off. The two signal lines 5c and 5d of the trunk cable 5 are connected to the input terminals of the relay terminal block 18, and the pair of power lines 20a and 20b of the separate power supply 19 are connected to the input terminals of the relay terminal block 18. On the other hand, the power supply lines 5a and 5b and the signal lines 5c and 5d of the trunk cable 5 downstream of the cutting position are connected to the output terminals of the relay terminal block 18. Thereby, the power lines 20a and 20b of the separate power supply 19 are connected to the power lines 5a and 5b of the trunk cable 5 downstream of the cutting position, and the signal lines 5c and 5c of the trunk cable 5 downstream of the cutting position. 5d, two signal lines 5c, 5 in the trunk cable 5 upstream of the cutting position.
d will be connected respectively.

[0009]

By the way, in the above-mentioned FA system, when the separate power supply 19 is connected, the connection work is troublesome and troublesome as described above, and the power supply lines 5a and 5b of the trunk cable 5 are connected. It is pointed out that it lacks reliability, for example, it cannot be said that the insulation treatment of the cut portion is not incomplete.

[0010] Therefore, an object of the present invention is to make it possible to reliably connect a power supply line to a branching connector with a simple operation. Another object of the present invention is to make it possible to easily attach another power supply via a branch connector when the voltage of the power supply from the master station drops below a predetermined value in a cable distribution system. And

[0011]

A first branch connector of the present invention is provided with a branch source cable including a power line and a signal line, a branch destination cable including a power line and a signal line, and a power line to be additionally inserted. In this state, the signal line of the branch destination cable is connected to the signal line of the branch source cable, and the power line additionally inserted to the power line of the branch destination cable is connected.

The second branch connector of the present invention is individually mounted on a branch source cable including a power line and a signal line, a branch destination cable including a power line and a signal line, and a power line to be additionally inserted. And the power supply line that is additionally inserted into the power supply line of the branch destination cable with respect to the signal line of the branch source cable with each cover attached separately. And a contact block to be connected.

[0013] The third branch connector of the present invention includes a branch source cable including a power line and a signal line, a branch destination cable including a power line and a signal line, a power line to be additionally inserted, and a relay power cable. The cover to be mounted, the signal line of the branch destination cable for the signal line of the branch source cable when each cover is separately mounted, and the power line of the branch destination cable for the power line to be additionally inserted And a contact block for connecting the relay power cable.

In each of the second and third branching connectors, each cover includes two holding plates that can be opened and closed by hinge connection, and the contact block includes one holding plate of each cover. It is composed of a plate that is pressed and attached in a palm-to-palm state, and in the area where each cover is pressed and attached in the plate, terminals that contact the core wire by peeling off the insulating sheath of the cable or power supply line attached to the cover are required In addition to being provided with several projections, wires for connecting necessary ones of the terminals in each area are embedded in the plate body, and one of the holding plates of each of the covers has a holding plate in a contact block. An insertion hole is provided to allow the terminal existing in the press-fitting mounting area of the plate to be inserted.

Further, the cable arranging system according to the present invention comprises:
With respect to the power from the master station, the branch source cable is branched to the branch destination cable by the branch connector, and the slave station is connected to the branch destination cable to supply the power to the slave station, When the voltage of the power supply at an arbitrary position of the source cable drops below a predetermined value, at least after that position, another power supply is supplied to the slave station in place of the supply of the power from the branch source cable to the slave station side. To supply the power to the slave station through the base station, and cut off the supply of the power from the master station to the branch destination cable and supply the separate power to the branch destination cable to the branch connector. This is done by attaching the cable.

The branch connector used in this cable arrangement system can be the above-described first to third branch connectors.

In short, in the branch connector of the present invention, when a power line to be additionally inserted is connected to the power line of the branch destination cable instead of the power line of the branch source cable,
The necessary connections can be made simply by attaching them to the required terminal positions, eliminating the need to cut the power supply line of the branch source cable as in the past, and using the conventional relay terminal block. Disappears.

In particular, in the third branch connector, a power line to be additionally inserted can be connected to another branch connector via a relay power cable. Therefore, the power line is connected to the other branch connector. It is not necessary to insert extra uselessly.

Further, in the above cable arranging system, the mounting of the separate power supply is performed via the branch connector used for branching from the branch source cable to the branch destination cable. Can be easily performed without using the

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 6 show a first embodiment of a branch connector according to the present invention. FIG. 1 is an exploded perspective view of the entire branch connector, FIG. 2 is a sectional view of a contact block, and FIG. 4, FIG. 4 is a bottom view with the cover opened, FIG. 5 is a cross-sectional view of the cover of FIGS. 3 and 4, and FIG. 6 is a temporary mounting state and mounting of the cover on the contact block. It is a side view of an important section showing a completed state.

In the figure, reference numeral 30 indicates the entire branching connector. The branching connector 30 includes a single contact block 40 and three covers 50A to 50C. For example, as shown in the FA system of FIG. Are connected to the two signal lines 6c and 6d of the branch cable 6 as branching cables, and the two power lines 6a and 6b of the branch cable 6 are connected to the trunk cable 5 by the signal lines 5c and 5d. It is used when two power lines 20a and 20b of another power source 19 are connected without connecting the two power lines 5a and 5b. The contact block 40 and each of the covers 50A to 50C are formed of a synthetic resin or the like. In FIG. 7, the same reference numerals are given to the same components or parts as those shown in FIG.

The contact block 40 is formed of a rectangular plate and has three covers 50A to 50C at four locations in the longitudinal direction on the upper surface and at two locations in the longitudinal direction in a substantially half area of the lower surface in the longitudinal direction. U-shaped engagement locks 41 are provided. Also, two covers 50A, 50B are provided on the upper surface side of the contact block 40.
The regulating walls 42, 42 for positioning at the time of mounting are projected. Further, in the contact block 40, for example, copper alloy terminals 43A to 43A are provided at a total of six places, that is, two places in the substantially half area in the longitudinal direction and four places in the remaining half area.
F is planted. The two terminals 43A and 43B in the substantially half area in the longitudinal direction and the two terminals 43C and 43D out of the four terminals in the remaining half area are provided so as to protrude only to the upper surface side, while the remaining two are provided. One terminal 4
3E and 43F are provided so as to penetrate both upper and lower surfaces. Note that the terminals 43A to 43A projecting only to one side
Of the terminals 43D, the terminals 43A and 43C are connected to each other by wiring embedded in the contact block 40, although the terminals 43B and 43D are not shown. In addition, on the upper and lower surfaces of the contact block 40,
Marks (for example, numerals 1 and 2) for designating the surfaces of the covers 50A to 50C to be mounted are respectively attached.

The three covers 50A to 50C are all the same, and include a pair of holding plates 51A to 51C, 52A to 52C.
Each side of 52C is openably and closably connected by a hinge portion. Opposite surfaces of the holding plates 51A to 51C and 52A to 52C are provided with positioning grooves 53A to 53C and 54 having a semi-circular cross section corresponding to the outer shape of the trunk cable 5 or the branch cable 6.
A to 54C are respectively formed. In this embodiment, since the backbone cable 5 and the branch cable 6 have a four-core flat shape, the positioning grooves 53A to 53C and 54A to 54C described above.
54C is arranged side by side four times. Inner holding plates 51A to 51C facing contact block 40 side
Required terminals of the contact block 50 (43A-
43F) are respectively provided with four insertion holes 55A to 55C through which the outer holding plates 52A to 52C can be inserted.
In C, four concave portions 56A to 56C into which front ends of required terminals (43A to 43F) of the contact block 40 can be fitted are provided on the surfaces of the inner holding plates 51A to 51C, respectively. In addition, two holding plates 51A-51
C, 52A-52C are provided with engaging pieces 57A at both ends of the open ends.
To 57C and the engaging holes 58A to 58C with which the engaging pieces 57A to 57C engage.
52A to 52C, and the holding operations of the holding plates 51A to 51C and 52A to 52C are maintained in a closed state. Furthermore, at the center of the open ends and the connection ends of the inner holding plates 51A to 51C,
The engagement projections 59A to 59C are provided on the outer holding plates 52A to 52C.
At the center of the open end and the connection end of the
Engagement protrusions 60A to 60C having different shapes from A to 59C are formed respectively. These engagement projections 59A-59
C, 60A to 60C are engaged with the engagement locks 41 of the contact block 40, so that three covers 5
0A to 50C are held in the contact block 40.

Next, a procedure for attaching the covers 50A to 50C of the branching connector 30 to the main cable 5, the branch cable 6, and the power lines 20a and 20b of the separate power supply 19 will be described.

First, the cover 50 for the backbone cable 5
A is mounted by sandwiching the middle of the trunk cable 5 between the pair of holding plates 51A and 52A of the cover 50A.
Close 2A. Thereby, the engagement piece 57A of the inner holding plate 51A engages with the engagement hole 58A of the outer holding plate 52A,
The closed state is maintained.

The cover 50 for the branch cable 6
The attachment of the cable B is the same as that of the trunk cable 5, except that the end of the branch cable 6 is housed inside the cover 50B.

Further, a pair of power supply lines 20 of another power supply 19
The attachment of the cover 50C to the main cables a and 20b is the same as that of the trunk cable 5, except that the power lines 20a and
A pair of power supply lines 20 are provided at both ends of the positioning grooves 53C and 54C of the pair of holding plates 51C and 52C of the cover 50C.
The difference is that a and 20b are fitted.

Then, the cover 50A attached to the trunk cable 5 is attached to the lower surface of the contact block 40 in a palm-split state, and the cover 50B attached to the branch cable 6 and the power lines 20a and 20b of the separate power supply 19 are attached. The attached cover 50 </ b> C is attached to the upper surface of the contact block 40 in a palm-to-palm state. First, each of the covers 50A to 50C is attached to the contact block 40.
6A, the engagement protrusions 59A to 59C of the covers 50A to 50C are pressed as shown in FIG.
C, 60A to 60C, and 61A to 61C are engaged with the engagement locks 41 of the contact block 40 by snap fit, and are temporarily mounted. Subsequently, each cover 50A to 50C is strongly pressed against the contact block 40 by using a tool such as a pliers, so that the contact block 40 shown in FIG.
As shown in (B), it is completely mounted. At this time,
The terminals 43A to 43F of the contact block 40 strip off the insulating sheaths of the main cable 5, the branch cable 6, and the power supply lines 20a and 20b, and the stripped core wires are fitted into the slits of the terminals 43A to 43F. , Thereby being electrically connected. Here, of the terminals 43A to 43F of the contact block 40, two terminals 43A to 43D in two places in a substantially half area in the longitudinal direction and two out of four places in the remaining half area protrude only to the upper surface side. , Terminal 43A and terminal 43C,
Although not shown, the terminals 43B and 43D are connected by the internal wiring of the contact block 40, so that the terminals 43A to 43D enable the power supply line 20 of the separate power supply 19 to be connected.
a and 20b are a pair of power supply lines 6a and 6b of the branch cable 6.
Will be connected to. Further, among the terminals 43A to 43F of the contact block 40, the remaining two terminals 43E and 43F are provided so as to penetrate both the upper and lower surfaces, and thus the two terminals 43E and 43F of the branch cable 6 are connected by these terminals 43E and 43F. The signal lines 6c and 6d are connected to the two signal lines 5c and 5d of the trunk cable 5. The two power lines 5a and 5b of the trunk cable 5
Will not be connected to any.

Next, the FA shown in FIG.
In the system, the branch connector 3 according to the first embodiment is used.
The operation procedure when additional power supply 19 is additionally connected using 0 will be described.

Here, the power supply 1 to the terminal station 4 _{N at the} terminal is
The supply voltage from the power supply 1 is not sufficient due to transmission loss, and the power supply voltage of the separate power supply 19 is supplied to the terminal station 4 _N without supplying the power supply voltage of the power supply 1.

[0032] In performing the connection such alternative power source 19, 10, remove the branching connector 7 for connection site of the branch cable 6 and trunk cable 5 end of slave stations 4 _N is attached, the Instead of Embodiment 1
Is attached. That is, since the cover 9A attached to the trunk cable 5 and the cover 9A attached to the branch cable 6 can be shared, the contact block 8 of the branch connector 7 is replaced with the contact block 8 of the branch connector 30 of the first embodiment. Block 4
It may be replaced with 0. Then, the power supply line 2 of the separate power supply 19
Covers 50A are attached to the contact blocks 40a and 20b in the form described above.
Attach ~ 50C. At this time, contact block 4
0, four terminals 43A-4 protruding only on the upper surface side
The power supply lines 20a and 20b of the separate power supply 19 are connected to the pair of power supply lines 6a and 6b of the branch cable 6 by 3D. Two signal lines 6c and 6d of the branch cable 6 are connected to two signal lines 5c and 5d of the cable 5,
The two power lines 5a and 5b of the trunk cable 5 are not connected to any of them. Thus, an FA system having a configuration as shown in FIG. 7 is obtained.

When the separate power supply 19 is connected in this way, it is not necessary to use the relay terminal block 18 as in the conventional example, and the work of cutting the trunk cable 5 and insulating the cut portion of the trunk cable 5 is performed. The work can be performed very easily and reliably, for example, it is not necessary at all.

It should be noted that the present invention is not limited to only the above embodiment, and various applications and modifications are conceivable.

[0035] (1) In the first embodiment, a single contact block 40, it is constituted by three cover 50A to 50C, as shown in FIG. 8, a single contact block 40 _1, The present invention also includes a structure including four covers 50A to 50D.

The fourth cover 50D has exactly the same structure as the other three covers 50A to 50C, and a duplicate description will be omitted. The contact block 40 ₁ of the second embodiment, of the six terminals 43a to 43f, 2 two terminals 43A, 43B of the upper and lower surfaces to dissimilarly to the aforementioned first embodiment is a point that is through, other configurations are identical It is.

The branching connector 30 of the second embodiment
₁ indicates that, in the FA system shown in FIG. 10, when the supply voltage from the power supply 1 becomes insufficient due to transmission loss at the position of the child station 4 _N-1 immediately before the terminal child station 4 _N , the terminal child station 4 for _N and the slave station 4 _N-1 of the immediately preceding, a single separate power supply 19
It is suitably used when a power supply voltage is supplied from a power supply. In this case, the slave station 4 _N-1 of the immediately preceding the end of the slave station 4 _N, connect a single separate power supply 19, the ends of the child through a further relay power cable 70 to the separate power supply 19 Connect to station _4N . Therefore, the branch connector 301 of the second embodiment is used for the slave station 4 _N-1 immediately before the terminal slave station 4 _N , and the branch connector 30 of the _first embodiment is used for the slave station 4 _{N at the} terminal. Is used.

Then, the branching connector 30 of the second embodiment
₁ is the upper surface of the contact block 40 '.
In a region where the two terminals 43A and 43B exist, another power source 1 is provided.
9 of the power supply line 20a, a cover 50c which is attached to 20b are mounted, contact the the lower surface of the block 40 ₁ two terminals 43A, the existence region of the 43B, the cover 50D is mounted at both ends to the relay power cable 70 One of them is press-fitted. On the other hand, in the terminal station 4 _N at the end, a cover 50A attached to the trunk cable 5 is attached to the lower surface of the contact block 40 of the branching connector 30, and a cover 50B attached to the branch cable 6 is attached to the upper surface. The attached cover 50C is press-fitted to the relay power cable 70, respectively. Incidentally, in order that the slave station 4 _N side cover 50D at the end of the relay power cable 70 to the upper surface of the contact block 40 of the branch connector 30 can press fitted, the slave station 4 _N side terminal of the relay power cable 70 The cover 50D is mounted upside down on the edge of.

As a result, as shown in the FA system in FIG. 9, in the child station 4 _N-1 just before the terminal station 4 _N ,
Two signal lines 6c and 6d of the branch cable 6 are provided for the two signal lines 5c and 5d of the trunk cable 5, and another power supply 19 is provided for the two power lines 6a and 6b of the branch cable 6.
And the power lines 20a and 20b of the other power supply 19 are connected to the power lines 6a and 20b of the branch cable 6 on the terminal station _4N side via the relay power cable 70, respectively. 6b.

[0040] In the branching connector 30 ₁ of the second embodiment, for example, separate power supply 19 of a single well in situations where the number of slave stations is two or more of insufficient supply voltage from the power supply 1 in the FA system shown in FIG. 10 Can be shared. Incidentally, in such a situation, when the branching connector 30 of the first embodiment is used, a plurality of separate power supplies 19 must be used.

(2) In each of the above embodiments, the cover 50
A to 50D have the same configuration. For example, a cover 50A to be attached to the main cable 5 and a cover 50C to be attached to the power lines 20a and 20b of the separate power supply 19 to be additionally inserted.
Alternatively, as for the cover 50D to be attached to the relay power cable 70, the cover 50D may be two instead of providing four insertion holes. This makes it possible to prevent erroneous mounting of the emergency cover 50A~50D against contact block 40, 40 _1.

[0042] (3) In the above embodiments, although the regulating wall 42 provided in the contact block 40, 40 _1, is also included in the present invention that omit this restriction wall 42.

(4) In each of the above embodiments, each cover 5
0A to 50D are two holding plates joined by hinges. However, the two holding plates are separated, and the two holding plates are separated from each other by using a structure to be connected by a locking portion and an engaging portion or a separate connecting member. You may comprise.

[0044]

In the branching connector according to the present invention, when a power supply line to be additionally inserted is connected to a power supply line of a branch destination cable instead of a power supply line of a branch source cable, they are attached to required terminal positions. Connection, the necessary connection can be made, the power supply line of the branch source cable does not need to be cut as in the past, and there is no need to use a relay terminal block as in the past. It can be done reliably with simple work.

In particular, in the branch connector according to the third aspect, a power line to be additionally inserted can be connected to another branch connector via a relay power cable, and the power line can be connected to the other branch connector. It is not necessary to insert wastefully, and waste of equipment can be eliminated.

In the cable arranging system according to the fifth aspect, the separate power supply is mounted via the branch connector used for branching from the branch source cable to the branch destination cable. It can be easily performed without using extra parts.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an entire branching connector according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the contact block of FIG. 1;

FIG. 3 is a top view showing a state where a cover of FIG. 1 is opened;

FIG. 4 is a bottom view showing a state where a cover of FIG. 1 is opened;

FIG. 5 is a sectional view of the cover of FIGS. 3 and 4;

FIG. 6 is a side view of a main part showing a provisionally mounted state and a completed mounting state of the cover on the contact block;

FIG. 7 is a configuration diagram of an FA system using the branching connector according to the first embodiment.

FIG. 8 is an exploded perspective view of the entire branch connector according to the second embodiment of the present invention.

FIG. 9 is a configuration diagram of an FA system using the branching connector according to the second embodiment.

FIG. 10 is a configuration diagram of an FA system using a conventional branch connector.

FIG. 11 is an exploded perspective view of the entire conventional branching connector.

12 is a plan view showing an additional connection form of an additional insertion power supply using a relay terminal block in FIG.

[Description of Signs] 5 Backbone cable 5a, 5b Power line of backbone cable 5c, 5d Signal line of backbone cable 6 Branch line cable 6a, 6b Power line of branch line cable 6c, 6d Signal line of branch line cable 19 Separate power supply 20a, 20b Power supply line of power supply 30 Branch connector 40 Contact block 41 Contact block engagement lock 43A to 43F Contact block terminal 50A to 50C Cover 51A, 51B Cover one holding plate 52A, 52B Cover other holding plate 55A to 55C One holding plate Plate insertion hole

Claims (6)

[Claims] 1. A branch source cable including a power supply line and a signal line,
With the branch destination cable including the power line and signal line and the power line to be additionally inserted attached, attach the signal line of the branch destination cable to the signal line of the branch source cable and the power line of the branch destination cable. A branching connector for connecting a power line additionally inserted to the branching connector. 2. A branch source cable including a power line and a signal line,
Covers that are individually attached to branch destination cables including power supply lines and signal lines, and power supply lines that are additionally inserted, and branch destinations for signal lines of branch source cables when each cover is individually attached. The signal line of the cable,
A contact block for connecting a power line to be additionally inserted into a power line of a branch destination cable; and a connector for branching. 3. A branch source cable including a power line and a signal line,
Covers that are individually attached to branch destination cables including power supply lines and signal lines, power supply lines that are additionally inserted, and relay power supply cables, and signal cables of branch source cables with each cover attached individually The signal line of the branching cable,
A contact block for connecting a power supply line of a branch destination cable and a relay power supply cable to a power supply line to be additionally inserted, respectively. 4. Each of the covers is composed of two holding plates which can be opened and closed by a hinge connection, and the contact block is formed of a plate on which one of the holding plates of each cover is press-fitted in a palming state. In a region where each cover is press-fitted in the plate body, a required number of terminals that come into contact with a core wire by peeling off an insulating sheath of a cable or a power supply line attached to the cover are provided. The wiring for connecting necessary ones of the terminals in each area is buried, and one of the holding plates of each of the covers is inserted into the contact block in the press-fitting mounting area of the holding plate in the contact block. The branching connector according to claim 2, wherein an insertion hole is provided to allow the branching. 5. A power supply from a master station is branched from a branch source cable to a branch destination cable by a branching connector, and a slave station is connected to the branch destination cable to supply the power to the slave station. When the voltage of the power supply at an arbitrary position of the branch source cable drops below a predetermined value, at least after that position, the supply of the power from the branch source cable to the slave station side is performed separately. What is claimed is: 1. A cable arranging system for supplying power to a slave station via a branch destination cable, comprising shutting off supply of power from the master station to the branch destination cable and supplying the power to the branch destination cable. In the operation of attaching the two cables to the branching connector. 6. A cable installation system according to claim 5, wherein the branch connector used in the cable installation system according to claim 5 is the branch connector according to claim 1.