JPS6394394A - Controller for master slave type vending machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a control device for a vending machine, and particularly to a control device for a vending machine that performs centralized control using a master-slave system.

[Conventional technology 1 A system of this type is shown in FIG.

100 is a master control unit which is a main control unit, and a transmitting/receiving device 101 for transmitting/receiving via the transmission line
It is equipped with Reference numeral 200 denotes a slave control unit that functions as a terminal control unit, and an internal control circuit 201 is connected to the transmission line 300 is the same terminal control unit as the slave control unit 200.

Furthermore, when the power is turned on or when the slave control unit 200.30
0 etc. stops functioning, the slave control unit 200
, 300, etc., a reset signal line Y is provided from the master control section 100 to each of the rape control sections 200, 300, etc. 102～
106 - are reset signal transmitting devices for respectively sending reset signals to each slave control section 200, 300, etc., and 203 is a reset signal receiving device connected to the reset terminal R of the control circuit 201 of the slave control section 200. The device is shown.

In this system, it is necessary to provide a reset signal line Y for each slave control unit 200, 300, etc., which increases the number of signal lines.
A plurality of circuit configurations were required to send a reset signal to each slave control section 200.

FIG. 2 shows a system previously proposed by the applicant.

A reset signal generation circuit 112 that generates a reset signal is newly provided in the master control unit 110, and normal control signals and reset signals are input and output to and from the transmission line X via the transmitting/receiving device 111. 210 is a slave control unit, and an internal control circuit 211 is a slave control unit.
2 to the transmission line X. Further, a reset circuit 213 is connected between the transmission line or the reset terminal R of the control circuit 211, and this reset circuit 213 is connected to a receiving device 213a that receives a signal from the transmission line X.
and a timer circuit 213b that counts the low level period from the signal received by the receiver 213a and outputs a predetermined signal when the counting time reaches a predetermined time, and the control circuit 211 by the signal from the timer circuit 213b. A reset signal output device r! that outputs a reset signal to the reset terminal R of the r! 1213c. 310 is the same as the slave control unit 210, and is connected to the transmission line X.

FIGS. 3A and 3B show signals sent from the master control unit 110 to the transmission line X, and the first half A of the signal includes signal data for selecting a desired slave control unit,
This is a normal control signal that communicates with the control circuit 211 of the selected slave control unit, and the latter half B is the part sent out as a reset signal, and the low level period La+tb
has been going on for a relatively long time.

Next, the operation of the above system will be explained.

The first half A of the signal sent from the master control unit 110 to the transmission line
2 to the control circuit 211 for normal data communication. On the other hand, the signal on the transmission line X is also input to the receiving device 213a of the reset circuit 213, and the low level period is counted by the timer circuit 213b. If this counting period becomes longer than a predetermined time, a predetermined signal is output from the timer circuit 213b, and as a result, a reset signal is sent from the transmitter 213c to the control circuit 211.
It is input to the reset terminal R of.

As shown in FIGS. 3(A) and 3(B), by setting the low level period representing the reset signal to two different widths such as ta and tb, the control circuit 2''i1 is It is also possible to send out two types of reset signals.

[Problem to be Solved by the Invention 1] However, in the above-mentioned system, one of the slave control units exhibits an abnormality, and for example, the control signal continues to be output at a certain level, or the control signal is output at a different timing. When it starts outputting pulse signals,
Although the master control unit 110 detects an abnormality in the slave control unit, it is unable to determine which slave control unit is abnormal, and due to the outflow of the abnormal signal, it is unable to communicate with any slave control unit from now on. become unable to do so.

In this case, a reset operation similar to the one used when turning on the power is required, but even if one slave control unit becomes abnormal, the entire system will stop functioning.
This invention aims to provide a master-slave type vending machine control device in which recovery is performed only for a slave control unit that has become abnormal or unable to communicate. purpose.

[Means for Solving the Problems 1] The master-slave vending machine control device of the present invention includes a plurality of slave control units that are terminal control units, and centrally controls the slave control units via a transmission line. In a master-slave vending machine comprising a master control section, each slave control section includes a transmitting means for transmitting a control signal to a transmission line, a receiving means for receiving a signal on the transmission line, and a transmitting means for receiving a signal on the transmission line. and a reset means for resetting the slave control section when the abnormal signal is monitored by the monitoring means.

[Operation 1 With the above configuration I), when an abnormal signal different from a normal control signal is output from the transmitting means of a certain slave control section, this abnormal signal is monitored by the monitor means and sent from the reset means to the slave control section. Only then will the reset be applied.

[Embodiment 1 FIG. 1 shows one embodiment of the present invention. Note that the same parts as those in the control system of FIG. 2 are designated by the same reference numerals, and the explanation thereof will be omitted.

In the slave control unit 210, 212'' is a receiving device connected between the transmission line X and the control circuit 211, and 212'' is a transmitting device.
A diode 214 for preventing reset signal inflow is connected between the output side of the 2" and the transmission line X. This diode 214 is a constant voltage diode, and the breakdown voltage of this constant voltage diode 214 is: Master control unit 11
It is lower than the level of the reset signal outputted from 0, and higher than the level of the abnormality signal outputted from each slave control section 210, 310, etc. 213 is a reset circuit, which resets the control circuit 211 by a signal Y from the master control section 110, and resets the control circuit 211.
In order to monitor whether there is any abnormality in the output signal from the transmitting device 21, the reset circuit 213
2” and the connection point between the diode 214 and the control circuit 211
a timer circuit 213b connected between the reset terminal R of the timer circuit 213b, which detects a low level or high level signal when it continues for a certain period of time, and outputs a predetermined signal;
The control circuit 21 is activated by the signal from the timer circuit 213b.
A reset signal output circuit 213c that outputs a reset signal to the reset terminal R of 1 is provided.

Next, the operation of the above system will be explained.

The control signal output from the master control section 110 is received by, for example, the receiving device 212' of the slave control section 210, and is input to the control circuit 211.

Further, the control signal from this control device 211 is sent to the transmitting device 2.
12'' and a diode 214 to the transmission line X, so that it is received by the master control unit 110.

Next, a case will be described in which the control circuit 211 goes out of control and operates abnormally, resulting in a state where sales are stopped. At this time, the control signal output from the transmitting device 212'' is generally a signal that remains at a high level or an abnormal signal that remains at a low level.This high level or low level continues. When the time becomes a predetermined abnormality, this abnormal signal is detected by the timer circuit 213b, and the timer circuit 213b outputs a predetermined signal.As a result, the reset signal output circuit 213C is activated and sends a reset signal to the control circuit 211. is output, the abnormal operation of the control circuit 211 is reset, and the state is restored to a state ready for sale.At this time, an abnormal signal also flows out to the transmission line X via the diode 21.t, and the slave control g310
However, the input to the reset circuit (not shown) of the slave control unit 310 is blocked by the intervention of a small diode (not shown) provided in each slave control unit 310, etc. The control unit 310 and the like do not perform a reset operation.

On the other hand, when the power is turned on, etc., each slave control unit 210
, 310, etc., the reset signal generation circuit 112 of the master control unit 110 outputs a high-level signal exceeding the breakdown voltage of the diode 214 described above. As a result, for example, the diode 214 of the slave control unit 210 becomes conductive, and the reset signal on the transmission line
4, the timer circuit 213b of the reset circuit 213
The slave control unit 210 is reset by being inputted to .

[Effect of the invention 1] In this invention, the output signal from the slave control unit, which is a terminal device, is monitored within the slave control unit, and when an abnormality is detected in the output signal, a reset is applied only to the slave control unit. , so like a conventional device,
Since the function of the entire system does not stop, for example, there is no problem such as the system being reset after a coin is inserted and the product not being sold. Furthermore, since there is no sales stoppage time due to reset, the reliability of the system is improved and sales efficiency is also improved.

[Brief explanation of the drawing]

FIG. 1 is a system block diagram showing one embodiment of a master-slave type vending machine control device of the present invention, ff
Figure 12 is a system block diagram of the control device related to the previous proposal, Figures 3 (A) and (B) are time charts of transmission signals used in the system of Figure 2, and Figure 4 is a diagram of the conventional master-slave system. FIG. 2 is a system block diagram of a control device of the system. DESCRIPTION OF SYMBOLS 110... Master control part, 111... Transmission/reception device, 112... Reset signal creation circuit, 210... Slave control part, 211... Control circuit, 212...
Receiving device, 212"... Transmitting device, 213... Reset circuit. 214... Diode. Patent applicant: Fuji Deniso Co., Ltd. agent Patent attorney: Hajime Aoyama and 2 others Figure 2 Figure 3 Date

Claims (1)

[Claims] (1) In a master-slave vending machine that includes a plurality of slave control units that are terminal control units and a master control unit that centrally controls the slave control units via a transmission line, each slave control unit: a transmitting means for transmitting a control signal to the transmission line; a receiving means for receiving the signal on the transmission line; a monitoring means for monitoring whether or not an abnormal signal is output from the transmitting means; 1. A control device for a master-slave type vending machine, comprising a reset means for resetting the slave control section when a signal is monitored.