JPS61264462A - Automatic setting system for device number - Google Patents

Abstract

PURPOSE:To set automatically the device number of each unit just with the series connection of these units by providing a device number recognizing circuit and an address decoding circuit connected to said recognizing circuit on each unit. CONSTITUTION:If a device number setting signal 7, for example, is equal to '0000' with a device number recognizing/address decoding circuit 6, a decoder 8 delivers '0111'. Here NOR circuits 11, 12, 13 and 14 deliver '1', '0', '0' and '0' respectively, and the signal 7 equal to '0000' is sent to the unit at the next stage. When an address signal is equal to '0000', a decoder 9 delivers '0000'. In this case, a NAND circuit 30 delivers '1' as long as the decoder 8 delivers '0111'. The output of '1' serves as a chip selection CS signal and the corresponding unit is selected as long as the CS signal is equal to '1'.

Description

[Detailed Description of the Invention] [Summary] In a system that includes a plurality of units and a control device that controls the plurality of units, the machine number setting for each unit is automatically performed by a machine number recognition circuit. This is an automatic machine number setting method.

[Industrial application field]

The present invention relates to an automatic machine number setting method in which machine numbers are automatically set by a machine number recognition circuit in a system having a control device that controls a plurality of units of the same type.

[Prior art and problems]

FIG. 5 is a diagram showing an outline of a conventional system in which a plurality of units are controlled by a control device. In FIG. 5, 1 indicates a control device, and 2 to 5 indicate units i. A known method for setting machine numbers in this type of system is to physically set them using short bins, etc. on each unit 2.3 and 4.5, but this conventional method There are disadvantages such as the work involved and the risk of incorrect settings.

[Purpose of the invention]

The present invention is intended to eliminate the above-mentioned drawbacks, and is to automatically set machine numbers in a system that includes a plurality of units of the same type and a control device that controls the plurality of units. The purpose of this project is to provide an automatic machine number setting method.

[Means to achieve the purpose]

Therefore, the automatic machine number setting method of the present invention provides machine number recognition on each unit in a system that includes a plurality of units of the same type and a control device that controls the plurality of units of the same type. A circuit and an address decoding circuit connected to the machine number recognition circuit are provided, each unit is connected in series, and when machine number information is input on the cable connected to the unit, it is transmitted to the next unit. The feature is that the following machine number information is output on the cable.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to the drawings. FIG. 1 is a cable connection diagram of the present invention. In the figure, 1 is a control device, and 2 to 5 are units of the same type. The logical connection diagram of FIG. 1 is shown in FIG. In FIG. 2, 6 indicates a machine number recognition and address decoding circuit. The machine number setting signal 7 and address signal from the control device 1 are
It is connected to the machine number recognition and address decoding circuit 6 on the top of the device number recognition and address decoding circuit 6.

FIG. 3 shows the internal configuration of the machine number recognition and address decoding circuit 6. In Fig. 3, 8 and 9 are decoders, 11 to 14 are NOR circuits, and 2 to 24 are AND circuits (
However, numerals 30 and 30 of negative logic respectively indicate NAND circuits. Now, assuming that the machine number setting signal 7 is ro OOOJ, the decoder 8 outputs ro 111J. At this time, the NOR circuit 11 is rlJ, and the NOR circuit 12 is rOJ.
, NOR circuit 13 is also rOJ, NOR circuit 14 is also "0"
is output, and a machine number setting signal 7 called rl O00J is sent to the next unit. rl When the machine number setting signal 7 of OOOJ is input, the machine number setting signal 7 of "0100" is sent to the next stage unit, and when the machine number setting signal 7 of "0100" is input, the machine number setting signal 7 of "0010" is sent. The unit number setting signal 7 is sent to the next stage unit 7), and when the machine number setting signal 7 of ro 010J is input, the machine number setting signal 7 of ro OOIJ is sent to the next stage unit. The address signal is decoded by the decoder 9, and the output signal of the decoder 9 and the output signal of the decoder 8 are compared in AND circuits 21 to 24, and if they match, the NAND circuit 30 outputs "1".
" is output. For example, the address signal is ro 000J
At this time, the decoder 9 outputs "0111", and if the decoder 8 outputs "0111" at this time, AND
Circuit 21 is "O", other AND circuits 22 to 24
outputs “1”, and as a result, the NAND circuit 30 outputs “1”.
" is output. The output of the NAND circuit 30 becomes C5 (chip select signal), and if this signal is "1",
That unit is selected.

According to one embodiment of the present invention, the machine number of each unit is automatically set simply by connecting each unit in series, there is no need to be conscious of setting the machine number, and there is no risk of incorrect setting. effective.

FIG. 4 is a diagram showing another embodiment of the configuration of the machine number recognition and address decoding circuit 6. In FIG. In FIG. 4, 40 represents an adder, 41 to 44 a matching circuit, and 50 an AND circuit. The difference from the embodiment shown in Fig. 3 is that the third
The difference is that the decoder 8 in the figure is replaced with an adder. Now, if ro O00J is input as the machine number setting signal 7, the adder 40 outputs ro OOIJ. Under this state, when the address signal is ro 001J, each of the minus number circuits 41 to 44 outputs "1", and the AND circuit 50 outputs a CS signal of "1". In Fig. 3, it is possible to connect the same number of units as the number of machine number setting signals 7, and in this case, a maximum of 4 units/) can be connected. Since the setting signal 7 can be verified as is, a maximum of 16 units can be connected in the embodiment shown in FIG. As described above, the embodiment shown in FIG. 4 has the advantage that the number of connected units can be increased as much as possible by specifying addresses.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, when connecting multiple units to a control device, the settings can be automatically made without being aware of the machine number settings, thereby eliminating erroneous settings. Further, it is possible to achieve effects such as easy connection.

[Brief explanation of drawings]

Fig. 1 is a cable connection diagram of an embodiment of the present invention, Fig. 2 is a logical connection diagram of the invention, Fig. 3 is a diagram showing the configuration of an embodiment of the machine number recognition & address decoding circuit, and Fig. 4. is a diagram showing another example configuration of the machine number recognition & address decoding circuit,
FIG. 5 is a conventional cable connection diagram. 1... Control device, 2 to 5... Unit of the same type, 6... Machine number recognition & address decoding circuit, 7
...Machine number setting signal, 8 and 9...Decoder, 11 to 14...NOR circuit, 21 to 24...AND
Circuit (negative logic), 30...NANDAND circuit...adder, 41 to 44...-number circuit, 50...
...AND circuit. 11th!1 2nd circle

Claims (1)

[Claims] In a system comprising a plurality of units of the same type and a control device for controlling the plurality of units of the same type, a machine number recognition circuit and a machine number recognition circuit connected to the machine number recognition circuit are provided on each unit. An address decoding circuit is provided, each unit is connected in series, and when machine number information is input on the cable connected to the unit, the next machine number information is output on the cable to the next stage unit. An automatic machine number setting method featuring: