JPH019085Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a selection switching device using a relay for selecting and switching inputs of a large number of thermocouples, resistance temperature detectors, etc.

Conventionally, this type of selection switching device has a relay drive circuit A and a plurality of relays as shown in Fig. 1.
A combination of a relay box _B0 having RY ₀ to RY ₉ and RY ₀₀ to RY ₉₀ is known. When a desired button among the plurality of button switches P ₀ to P ₉ and P ₀₀ to _{P 90} of the relay drive circuit A is pressed, the address switch group
The corresponding switch in AS is turned on and the desired relay in relay box _B0 is energized. For example, pressing pushbutton switches P ₀ and P ₀₀ turns on address switches S ₀ and S ₀₀ , which turns on the relay in relay box B ₀ .
RY ₀ and RY ₀₀ are energized. When RY ₀ and RY ₀₀ are energized, their contacts r ₀ and r ₀₀ are turned on and the input terminals are turned on.
Select No0. Similarly, pushbutton switch P ₁ ,
When P ₉₀ is pressed and address switches S ₁ and S ₉₀ are turned on, relays RY ₁ and RY ₉₀ are energized and the input terminals are
No.91 is selected. In this way, one desired point is selected from a total of 100 input points ranging from 0 to 99.
By the way, when three relay boxes B ₀ , B ₁ , and B _{2 are used to increase the number of input points and select a desired point from 300 input points, for example, the relay boxes B 0 , B 1 , and B 2} are used as shown in Figure 2. In the drive circuit A, the first relay box B ₀
address switch group AS ₀ and the second relay box B ₁
Address switch group AS ₁ and 3rd relay box
B ₂ address switch group AS ₂ is provided, and for example, when pushbutton switch P ₀ is pressed, the address switch group
The switch S ₀ of AS ₀ , AS ₁ , and AS ₂ is configured to be turned on at the same time, and the relay boxes B ₀ , B ₁ ,
Station switch group SS for selecting B ₂
For example, press the pushbutton switch P ₀₀₀ to switch SS
The configuration is such that relay box B ₀ can be selected when switch S ₀₀₀ is turned on. Therefore, when pushbutton switches P ₉ , P ₉₀ , and P ₂₀₀ are pressed, SS switch S ₂₀₀ is turned on and relay box B ₂ is selected.
Switches S ₉ and S ₉₀ of AS ₀ , AS ₁ , and AS ₂ are turned on, relays RY ₉ and RY ₉₀ are energized, and the input terminals are
No.299 is selected. In this way, with conventional selection switching devices, when the number of relay boxes is increased to increase the number of input points, the number of address switches increases and the configuration of pushbutton switches must be changed, making it difficult to change the system on site. There were flaws. Furthermore, if the address switch group and the pushbutton switches were configured to allow switching of the maximum number of points in order to facilitate system changes, there was a drawback that the system would be wasted if the number of input points was small.

An object of the present invention is to realize a selection switching device in which the number of input points can be easily increased or decreased and there is less waste even when the number of input points is small.

FIG. 3 is a connection diagram showing one embodiment of the device of the present invention, and shows a case where the number of input points is 300 points. Third
In the figure, the relay drive circuit A includes pushbutton switches P0 to _P9 , _P00 to _P90 , _P000 to _P900 , an address switch group AS, _a station switch group SS, and a power source E. Pushbutton switch P ₀
〜P ₉ , P ₀₀ 〜P ₉₀ correspond one-to-one to the switches S ₀ 〜S ₉ , S ₀₀ 〜S ₉₀ of the address switch group AS, respectively, and P ₀₀₀ to _{P 900} correspond to the switch S ₀₀₀ of the station switch group SS. ~S ₉₀₀ in one-to-one correspondence. Furthermore, relay boxes B ₀ , B ₁ , and B ₂ have the same structure.
The configuration will be explained for _B0 . Relay box B ₀ is
Address input terminals IN ₀ to IN ₉ , IN ₀₀ to which address signals are applied due to the on/off of the address switch
~IN ₉₀ and an address output terminal for outputting the address signal applied to the address input terminal to the outside.
It has OUT ₀ to OUT ₀₀ and OUT ₀₀ to _{OUT 90} , and each address input terminal and the corresponding address output terminal are connected by address lines l ₀ to l ₉ and l ₀₀ to l ₉₀ , respectively. Each address input terminal is equipped with a malfunction prevention diode _D0 to _D9 , _D00 to _D90 and a relay.
Series circuit with RY ₀ ~ RY ₉ , RY ₀₀ ~ RY ₉₀ R ₀ ~ _{R 9} ,
One ends of R ₀₀ to R ₉₀ are connected. In addition, station input terminals IN 000 to IN ₀₀₀ to which station signals are applied by turning on and off the station switch.
IN ₉₀₀ , and station output terminals OUT ₀₀₀ to OUT ₉₀₀ that shift the station signal applied to the station input terminal and output it to the outside.
IN ₁₀₀ like _IN 100 and OUT ₀₀₀ , IN ₂₀₀ and OUT ₁₀₀
~ _IN900 are sequentially shifted and connected to _OUT000 ~ _OUT800 by station lines _l100 ~ _l900 . Furthermore, the first station input terminal
IN ₀₀₀ is connected to the series circuit R ₀ ~ via station wire l ₀₀₀
It is commonly connected to the other ends of R ₉ , R ₀₀ to R ₉₀ .
Each relay box is cascaded to relay drive circuit A. In other words, relay drive circuit A and relay box
Connect B ₀ to cable with connector K ₀ , connect relay box B ₀ and relay box B ₁ to cable with connector K ₁ , and connect relay box B ₁ and relay box B ₂ to cable with connector K ₂
If connected respectively, the relay of each relay box will be connected to the corresponding address switch, each relay box will be connected to the corresponding station switch,
The station numbers are automatically assigned in order from the one closest to the relay drive circuit A. Therefore, there is no need to set a machine number to distinguish the order in which the relay box is connected, and the number of input points can be easily increased by simply connecting the relay boxes in a subordinate manner.

In such a configuration, the pushbutton switch
Press P ₀ , P ₀₀ , P ₀₀₀ to switch address switch S ₀ , S ₀₀
and station switch S ₀₀₀ is turned on,
Relays RY ₀ and RY ₀₀ of relay box B ₀ are excited, and input terminal No. 0 is selected. At this time, the prevention diodes D ₀ to D ₉ , D ₀₀ to _{D 90} prevent the current flow as shown by the dotted line in the figure, and RY ₀ , RY ₀₀
This prevents other relays from being energized. Note that diodes D′ ₀ to D′ ₉ , D′ ₀₀ are connected in parallel to the relay.
~D' ₉₀ is for preventing back electromotive force when the shield is cut off. Next, press the push button switches P ₀ , P ₀₀ , P ₀₀₀ and S ₀ ,
S ₀₀ and S ₁₀₀ are turned on, and the station signal from S ₁₀₀ enters the input terminal IN ₁₀₀ of relay box B ₀ , but it is shifted by relay box B ₀ and input terminal of relay box B _1.
It enters IN ₀₀₀ , relays RY ₀ and RY ₀₀ of relay box B ₁ are energized, and input terminal No. 100 is selected.

Note that electronic switches may be used as the address switch and station switch of the relay drive circuit A. Also, the number of relays in the relay box is
Although 20 cases are shown as an example, this can be changed as necessary.

As explained above, the present invention is configured so that multiple relay boxes with the same structure can be connected to one relay drive circuit, so it is easy to increase or decrease the number of input points, and the number of input points is small. In this case, a selection switching device with less waste can be obtained.

[Brief explanation of the drawing]

1 and 2 are connection diagrams showing a conventional example, and FIG. 3 is a connection diagram showing an embodiment of the device of the present invention. A...Relay drive circuit, AS...Address switch group, SS...Station switch group, _B0 ,
B ₁ , B ₂ ...Relay box, RY ₀ ~ RY ₉ , RY ₀₀ ~ _{RY 90}
...Relay, D ₀ - D ₉ , D ₀₀ - _{D 90} ... Malfunction prevention diode, IN ₀ - IN ₉ , IN ₀₀ - IN ₉₀ ... Address input terminal, OUT ₀ - OUT ₉ , OUT ₀₀ - OUT ₉₀
...Address output terminal, IN ₀₀₀ to IN ₉₀₀ ...Station input terminal, OUT ₀₀₀ to OUT ₉₀₀ ...Station output terminal, _l0 to _l9 , _l00 to _l90 ...Address line, _l000 to _l900 ... ...Station line.

Claims (1)

[Claims for Utility Model Registration] A plurality of relay boxes are sub-connected to a relay drive circuit, a desired relay box is selected from among the plurality of relay boxes with a station switch of the relay drive circuit, and each relay box is connected with an address switch. A device for selecting a desired relay among relays in a box, wherein each relay box has a plurality of address input terminals to which an address signal generated by the address switch is applied, and each address input terminal is connected to an address line. a plurality of address output terminals that are connected and output externally address signals applied to the address input terminals; a series circuit of a malfunction prevention diode and a relay, one end of which is connected to each of the address input terminals; a plurality of station input terminals to which station signals generated thereby are applied; a plurality of station output terminals to which the station signals applied to each station input terminal are shifted by respective station lines and output to the outside; and the plurality of series circuits. means for commonly connecting the other end to the No. 1 station input terminal; and means provided correspondingly to each of the relays, the means being turned on when the corresponding relay is energized by the station switch and the address switch. , a contact for selecting a corresponding input terminal from among the plurality of input terminals provided in the relay box;
A selection switching device characterized by being provided with.