JPS63260296A - Centralized supervisory equipment for sensor of device - Google Patents

Abstract

PURPOSE:To simplify the wiring of device by connecting a control section and each sensor by wiring of an identification signal line, a clock signal line, a sensor state signal line, a power supply line and a ground line. CONSTITUTION:The inside of a control section M is provided with a clock oscillator 1, a sensor identification signal generator 2, a latch 3 whose write/read address is designated and a microcomputer 4. Sensor sections S1, S2 are provided respectively with shift registers 5, 5', coincidence detection circuits 6, 6' for open collector output and sensor identification code setting devices 7, 7' preset for each sensor. The control section M and the sensor sections S1, S2 are connected by the identification signal line 10c, the clock signal line 10b, the sensor state signal line 10a, the power supply line 10e and the ground line 10d.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial field of application The present invention is applicable to a copying machine in which a large number of ON/OFF sensors are distributed throughout the main body and these sensors need to be centrally monitored by a control unit in one location. The present invention relates to a sensor centralized monitoring device for devices such as machines that can monitor all sensors with a minimum number of wires.

←) Prior Art In order to smoothly execute control in a conventional electronic copying machine, jam sensors (Jl) (J2) (
Jl), table position sensor ('l)(T2)(
T3), lens position sensor (Ll) (L2), vapor cassette sensor (E) (C), door sensor (D), and many other sensors are distributed throughout the main body in the form of photointerrupters, reed switches, and microswitches. are doing. Conventionally, the ON-OFF states of these sensors are shown in Figure 6. The 10FF signal is sent one by one to the control microcomputer 12 through the signal line (+51 connected in parallel to the control unit (M5, input capo) fiDt-). The sensor was sent to the photointerrupter (if it was 131, the power line and ground line,
If it was a reed switch or a microswitch (82'), the ground line was wired separately. For this reason, the number of wirings is large and complicated, there is a risk of incorrect wiring, and there are mechanical constraints in securing a large number of wiring meridians.

Further, as an electronic copying machine in which various functions can be added or selected, for example, one described in Japanese Patent Application Laid-open No. 178462/1983 has been proposed.

The invention described in this publication is of a type in which an identification address is output and the sensor responds to it, and requires as many pass lines as the number of address bits.

(c) Purpose of the Invention The present invention has been made to solve the problems of the prior art, and aims to provide a sensor centralized monitoring device that can simplify the wiring of devices and prevent the risk of incorrect wiring. It is.

B) Structure of the Invention The present invention provides a sensor centralized monitoring device for equipment in which a plurality of ON-OFF sensors are disposed at various locations within a main body and the status of each sensor is centrally monitored by a control unit, and the control unit is provided with a clock. a signal generator, an identification signal generator for each sensor, and an addressable latch for temporarily storing a status signal from each sensor; and an addressable latch for temporarily storing a status signal from each sensor; It includes a shift register for receiving data, and a match detection circuit for detecting a match between the output of the shift register and an identification code assigned to each sensor, and connects the control unit and each sensor to an identification signal line, a clock. This is a sensor centralized monitoring device for equipment that is connected by wiring of a signal line, a sensor status signal line, a power supply line, and a ground line.

This sensor centralized monitoring device monitors a large number of sensors placed in various parts of equipment from a single control unit.It has an identification signal line, a clock signal line, a sensor status signal line, a power supply line, and a ground line. It is only necessary to install five wirings, and this wiring and each sensor can be connected in a pass line format, so it is possible to prevent wiring congestion inside the device and also to prevent incorrect wiring a1. be able to.

(e) Example An example of the present invention will be described below with reference to FIGS. 1 and 2. (M) is a control unit with an internal reference clock oscillator (1
), a sensor identification signal generator (2), a latch (31) that can specify write and read addresses, and a microcomputer (4). (Sl) is a photointerrupter sensor (8).
), (S2) is a sensor part including a reed switch or microswitch (91), and each sensor part includes a shift register +5+tm, an open collector output coincidence detection circuit re+tst, and a sensor part that is preset for each sensor. It is equipped with a sensor identification code setting device (7) + 71, and a control section (M) and a sensor part (81).
(82) is cascade-connected with five pass lines αG.

Note that up to 15 sensors can be installed following 51.82.

In this embodiment, the sensor identification signal generator (2) has four stages of D.
The shift register has a flip-flop and one exclusive OR gate. When the shift register is started, all the flip-flops are set by the microcontroller (4), and after that, the square wave output (101) of the clock oscillator (1) is set. ) in synchronization with the rise of (2), in the order of input side of the shift register.
The same pattern is repeated every 15 clocks, such as the output waveforms of 01λ (202) and C203λ (204). (2
05) is (201) as MSB (most significant bit), (20
4) is expressed in hexadecimal notation when L8B (least significant bit) is used. Thus, the clock signal (101) and the sensor identification signal (204) are connected to the bus line ycI (l line (
10b) (10C), the control unit (M) sends the signal to the sensor part (81>(82)...).

-1 sensor part (81), (82)...'s shift register (51 (51) both input the sensor identification signal (204) and operate with the clock signal (101), so their output signals are activated After 4 clocks have elapsed, the same output signals (501) (502) (505) (504) are always presented.

(505) is the MSB of the output signals (501) and (504), respectively.

In hexadecimal notation when L8B is used, the above notation (205) of the shift register (2) of the control unit (M) is 4 crots 1.
~F is set by means such as a jumper wire or a fuse blowout, and the set value and the output of the shift register +5+t5r are detected by the coincidence detection circuit (6) (A). The output is output from an open collector, and if a match is detected, it becomes a key level, otherwise it becomes Hz (high impedance).If the code setting value is 1 (601"), if it is 2, it becomes C602). ..., F, the output of (615) is obtained.-The output of the diffuser circuit (6) (61 is the output of the light emitting diode if the sensor included in the sensor part is the photointerrupter (8) (8a) side, and the collector of the transistor (8b) side is wired OR connected to the sensor status signal line (10a).Also, if the sensor is a reed switch or a microswitch (9), - the diffused exit path ( 6) (The output of 6 is connected in series to the contact part, and the wired O is connected to the status signal line (10a).
R connected. For example, the status signal line connected in this way is connected to the code setter +7 of the connected sensors.
Obtain the signal waveform when the 3m sensor set to 1, 3 and F at ++7'+ is in the ON state (102). In this way, depending on the waveform of the status signal line, which of the 15 sensors is ON (the others are OFF).
This signal indicating the sensor status of the controller (M
) and addressed by the four-stage shift register output (205) included in the sensor identification signal generator (2), and the clock oscillator is stored in the latch (3) at the low level of the one output (101). . At this time, the output of the sensor identification signal generator (2) and the shift register (
There is a time difference of 4 clocks from the output of 5H51, so the state of the signal set to 1 in the code setter +71F71 of the sensor part is set to the F address of the latch, and the state of the sensor set to 2 is set to the F address of the latch. ..., the state of the sensor to which F is set is stored at address A of the latch, but this is obvious in advance and does not cause any problem in practice. In this way, the states of up to 15 sensors are always stored in the latch +31 during 15 clocks, and the microcomputer (4) can search the states of each sensor at any time through the latch (3).

In this example, the number of stages of each shift register is 4, so 1
The status of 5 sensors can be monitored, but if the number of stages is 5, it can be expanded to 31, and if it is 6, it can be expanded to 63 sensors. Furthermore, if only the sensor status signal lines are increased to two, the number of shift register stages can be expanded to 60 sensors even if the number of stages is four, and if the number of stages of the shift register is increased to four, the number of sensors can be increased to 60.

(f) Effects of the Invention By adding a relatively simple common circuit to some of the sensors, the present invention can centrally monitor a large number of sensors with a minimum number of wires, making equipment wiring easier. Since it is a pass line type, the risk of incorrect wiring can be eliminated. In addition, in the control section, it is easy to design a circuit board with a small number of connections.
The reduction in board size can be seen. Furthermore, even if the number of sensors increases, as long as it is within the limit due to the number of shift register stages,
This can be done without changing the control circuit or increasing the number of wires.

[Brief explanation of drawings]

Fig. 1 is a circuit configuration diagram of an embodiment of the present invention, Fig. 2 is a waveform diagram for explaining the embodiment, Fig. 3 is a circuit diagram for explaining the prior art, and Fig. 4 is a diagram of the inside of the main body of the copying machine. FIG. 3 is a layout diagram showing the arrangement of sensors. (M)...Control unit, (81)(82)...Sensor part, (1)...Clock generator, (21...Sensor identification signal generator, (Death...Latch, ( Death...
Shift register, (6)...-dispersion circuit, (1
(1... Pass line.

Claims (1)

[Claims] (1) In a sensor centralized monitoring device for equipment in which a plurality of ON-OFF sensors are installed at various locations within the main body and the status of each sensor is centrally monitored by a control unit in one location, the control unit includes a clock signal generator and each a sensor identification signal generator;
an addressable latch for temporarily storing a status signal from each sensor, and a shift register for receiving an identification signal from the identification signal generator for each sensor; a match detection circuit that detects a match with an identification code assigned to a sensor, and connects the control unit and each sensor to an identification signal line, a clock signal line, a sensor status signal line, a power supply line, and a ground line. Centralized sensor monitoring device for equipment connected by wiring.