JP3315216B2 - Equipment with safety stop function by sensor signal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device provided with a sensor for detecting an abnormal operation of a device and having a safety stop function by a sensor signal for stopping the device when the sensor detects an abnormal operation.

[0002]

2. Description of the Related Art For example, a combustion device such as a water heater has a C as an abnormality detection sensor for detecting the concentration of CO in exhaust gas.
An O sensor and a safety stop function for closing the gas valve of the fuel supply passage and stopping combustion when the CO sensor detects a CO concentration exceeding a dangerous CO concentration set reference value,
Safety against CO gas by hot water supply combustion is achieved.

[0003]

At the final stage of the production of this type of water heater or at the stage of shipping the product, the combustion capacity is adjusted in accordance with an inspection manual given in advance to confirm the tapping temperature and the tapping temperature. The quantity of hot water is checked, error messages and the like displayed on the remote controller of the water heater are checked, and finally, the product is shipped in a form in which it normally burns.

However, in a water heater with a safety stop function using a CO sensor, if the inspection is performed according to the inspection manual, the gas pressure of the fuel supply and the like are not adjusted in the initial state of the inspection. When abnormal combustion occurs in the initial stage of inspection, etc., the CO concentration of the generated CO gas also becomes high, and the CO sensor detects this, and the safety stop function operates to stop the combustion. Thus, there is a problem that the subsequent inspection cannot be performed.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a safety stop function of a device.
An error detection signal is output from the error detection sensor during inspections other than
It is to provide a safety stop function with equipment according to sensor signals can be performed without any trouble inspection without being safe stop.

[0006]

The present invention is configured as follows to achieve the above object. That is, the first invention includes an abnormality detection sensor that detects an operation abnormality,
In the device with a safety stop function that controls the device operation in the control mode in response to the abnormality non-detection signal of the abnormality detection sensor and stops the device operation based on the abnormality detection signal from the abnormality detection sensor, the inspection is performed in addition to the control mode. equipped with a test mode for performing the inspection operations according to the program, the inspection mode smell
Management circuit abnormality detection signal ignoring excluded sensor signal from the abnormality detection sensor during inspection operation other than inspection of abnormality detection operation of the abnormality detection sensor is provided Te, the management circuitry
The inspection operation of the inspection program is a detection other than the abnormality detection operation.
Automatically detect abnormalities at least when starting inspection
It has a function to ignore and exclude the abnormality detection signal from the sensor,
Automatically when checking the abnormality detection operation of the abnormality detection sensor
Action to ignore and exclude the abnormality detection signal from the abnormality detection sensor
Is configured to Rukoto which have a function to release the work as a feature, also, the second invention, a configuration of the first invention, by comprising providing a switching means of the control mode and the inspection mode According to a third aspect of the present invention, the inspection program is provided from outside the device, and the device is provided with an input terminal for receiving the inspection program from the outside. This is a characteristic configuration .

[0007]

In the present invention having the above-described structure, when inspecting a device, the mode is switched from the control mode to the inspection mode.
The inspection proceeds according to the inspection program. This inspection
In the inspection process other than the safety stop function of, even if an abnormality is detected by the abnormality detection sensor, the abnormality detection signal from that sensor is ignored and excluded by the sensor signal management circuit,
Since the safety stop function of the device does not operate and the inspection operation is not interrupted, the inspection operation can proceed according to the inspection program without any trouble.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show the configuration of a first embodiment of the present invention. As a device with a safety stop function of this embodiment, C
The present invention is directed to a water heater with an O sensor, and FIG. 2 shows an inspection system of the water heater 1. The water heater 1 includes a burner 3, a heat exchanger 4, a supply / exhaust combustion fan (not shown), a control unit 5, a filter confirmation switch 6, and a CO installed on the exhaust side in the appliance case 2. The sensor 7 is provided.

A filter 8 is attached to the instrument case 2 on the air inlet side. When the filter 8 is properly attached, the filter confirmation switch 6 is operated by the claw 10 of the filter 8, and the switch 6 is turned on. When the signal is applied to the control unit 5, the control unit 5 can detect and confirm that the filter 8 is correctly attached.

An inspection station for inspecting the water heater 1 includes a water supply connection pipe 11 connected to a water supply side pipe of the heat exchanger 4,
A hot water supply connection pipe 12 connected to the outlet pipe of the heat exchanger 4 and a gas supply connection pipe 13 connected to the gas introduction side of the burner 3 are provided. The water supply connection pipe 11 detects the flow rate of water supply. Flow meter 14 and a water solenoid valve 15 for opening and closing the pipeline,
A feed water temperature sensor (not shown) for detecting the feed water temperature is provided, and a hot water supply temperature sensor 16 for detecting the hot water temperature is provided in the hot water connection pipe 12. Is provided with a gas solenoid valve 17 for opening and closing the gas passage. Further, a pressure gauge 18 for detecting a gas supply pressure is connected to the burner 3.

The control unit 5 receives the information on the feed water temperature, the flow rate of the feed water by an instrument flow meter (not shown), and the detected hot water temperature of an instrument temperature sensor (not shown). The control mode includes a control mode for controlling the combustion operation of the burner 3 so as to increase the temperature to a set temperature, and a test mode for performing a test operation according to a test program.

FIG. 1 shows a configuration including a control mode and an inspection mode. The control mode includes a control program for performing a sequence operation of a normal combustion operation in the control mode.
In this embodiment, the inspection mode includes an inspection interruption mode and a manual interruption mode. In the inspection interruption mode, an inspection program of an external device (a personal computer in this embodiment) is supplied from the product line inspection terminal 20 for inspection. It can be added to the interrupt mode. The manual interrupt mode is selected and designated by a setting mode switch 21 as a manual mode switching means.

FIG. 3 shows a connection form of the control unit 5.
The control unit 5 includes a setting mode changeover switch 21, a combustion mode fan mode changeover switch 22, a product line inspection terminal 20 as an input terminal, a clear switch 23, a gas type changeover switch 24, and a capacity changeover switch 25. And The controller 5 is connected to a remote controller 26 for designating a set temperature of hot water supply and displaying an error or the like.
The CO detection signal of the CO sensor 7 is a CO detection unit.
27, and a monitor lamp 46 for displaying an operation state is connected.

In this embodiment, a temperature sensor is installed near or inside the CO sensor. The CO detection unit 27 detects the CO concentration detection output of the CO sensor 7, the detection output of the temperature sensor, and the disconnection of the CO sensor 7. Are output to the control unit 5. The controller 5 has a safety stop function for CO gas, and this circuit has a double safety circuit of a CO concentration integration safety circuit 29 and a forced safety circuit 30, as shown in FIG. Since the control unit 5 uses a microcomputer, the control unit is c in FIG.
pu.

The CO concentration integrating safety circuit 29 is based on the detected value of the CO concentration applied from the CO sensor 7 and assumes that a person has been exposed to the atmosphere of the detected concentration.
The ratio ER of the hemoglobin CO concentration in the blood taken into the blood to the dangerous concentration is obtained for each sampling time of CO detection, and the ERs obtained in each sampling are integrated. The integrated value TR (TR = ΣER _n ) is dangerous. Concentration T
When R = 1.0 (blood hemoglobin CO concentration reaches 25%), a gas valve drive signal is output.
Also, in this embodiment, in order to further enhance the safety, TR
Also, when the pressure reaches a predetermined value obtained in the range of 0.7 to 0.9, the gas valve drive signal is output. When the integrated value TR of the blood hemoglobin CO concentration is obtained, the integrated value TR may be obtained based only on the CO detection concentration of the CO sensor 7. However, in this embodiment, the time during which the CO detection output is not stably output from the CO sensor is obtained. Within this range, it is estimated that CO gas having a concentration lower than the lowest detection limit level of the CO sensor 7 is generated, and the concentration of the CO gas is estimated to obtain the integrated value TR of the blood hemoglobin CO concentration. ing.

[0016] The CO when the gas valve drive signal from the concentration accumulated safety circuit 29 is output, the transistor 31 Gao and off <br/>, gas in the gas passage for supplying the burner 3 operates the gas valve drive relays In FIG. 2, the gas solenoid valve 17 is shut off.

The forced safety circuit 30 also functions to shut off the gas solenoid valve when the CO sensor 7 detects a high CO concentration exceeding a predetermined concentration, even momentarily. Is performed as follows. The reference voltage is applied to the non-inverting input terminals of the operational amplifiers 34 and 35, and the detection output (COPt) from the temperature-compensated CO sensor is applied to the inverting input terminal of the operational amplifier 34. A signal of the detected temperature (Pt) of the installation area of the CO sensor 7 is applied to the input terminal.

Even if the CO sensor 7 is momentary, a high CO
When the density is detected, the voltage applied to the inverting input terminal of the operational amplifier 34 becomes high level, and the output side of the operational amplifier 34 becomes low level (L level). As a result, the transistor 36 is turned off, and accordingly, the transistor 36 is turned off. Becomes high level (H level), the base voltage of the transistor 37 increases, and the transistor 37 turns on. By the on operation of the transistor 37, the base of the transistor 31 becomes L level and the transistor 31 is turned off. Then, the gas valve drive relays
Since the operation is stopped, the drive signal to the gas solenoid valve 17 is stopped, the gas solenoid valve 17 shuts off the gas passage by which the combustion of the burner 3 is stopped, the safety is achieved for the CO gas It is.

What is characteristic in the present embodiment is that when the water heater 1 is inspected according to the inspection program, the CO sensor 7 detects high-concentration CO gas generated when adjusting the combustion state or the like. In order to solve the conventional problem that the gas solenoid valve 17 is shut off and the subsequent inspection cannot be performed, except for inspecting the operation state of the CO sensor 7, the CO concentration detection signal of the CO sensor 7 is ignored and excluded. That is, a sensor signal management circuit 38 is provided in the control unit 5.

The management circuit 38 detects the progress of the inspection program when the inspection mode is selected and designated, and
At the time of operation other than checking the operation state of the sensor 7, FIG.
Is applied to the transistor 40 shown in FIG. As a result, the transistor 40 is turned on. As a result, the base voltage of the transistor 37 becomes L level, and the transistor 37 is turned off. Then, the transistor
When the base voltage of the transistor 31 becomes H level, the transistor 31 is turned on, the gas valve drive relay 32 is driven, and the burner 3 is turned on.
2, the gas solenoid valve 17 is maintained in an open state, regardless of the signal from the CO concentration integration safety circuit 29, and also receives the signal from the forced safety circuit 30. Regardless, the gas valve drive relay 32 is always in the drive operation state, and the gas solenoid valve 17 is kept open.

Therefore, even if abnormal combustion occurs in the inspection process of the water heater 1 and the CO concentration of the generated CO gas becomes high, the gas solenoid valve 17 is not closed, and the inspection of the water heater 1 continues without any trouble. Can proceed. Note that the management circuit 38 stops the ON drive signal to the transistor 40 when the inspection program becomes an item for inspecting the operation state of the CO sensor 7. Then, by intentionally deteriorating the combustion state and increasing the CO concentration of the generated CO gas,
If the CO sensor 7 is normal, the compulsory safety circuit 30 operates to shut off the gas solenoid valve 17 and stop the combustion. This combustion stop is confirmed, and the normality of the CO sensor 7 is checked. be able to.

In this embodiment, a personal computer 41 shown in FIG. 2 has a built-in inspection program for the water heater 1, and the personal computer and the control unit 5 are connected via an interface 42. Further, the personal computer 41 has a pressure detection signal of a pressure gauge 18 for detecting a gas pressure supplied to the burner 3, a detection signal of a tapping temperature of the temperature sensor 16, a detection signal of a supply water temperature, and a flow detection signal of a flowmeter 14. In addition, an operation signal is applied to the gas solenoid valve 17 and the water solenoid valve 15 from the personal computer 41 side.

When the water heater 1 is inspected, the water heater 1 to be inspected is placed on an inspection line pallet and sent to an inspection station. The inspection of the water heater 1 sent to the inspection station is performed according to the inspection program of the personal computer 41 and the numbers in Tables 1 and 2 by transmitting and receiving signals of the personal computer 41 and the control unit 5.

[0024]

[Table 1]

[0025]

[Table 2]

First, No. In the first operation procedure, the water heater 1 is set on the inspection table together with the pallet. Next, No. 2
In the procedure (1), the inspection worker connects the pipes on the water heater 1 side, the pipes for gas, water supply and hot water supply (hot water supply) on the inspection table side, and the connection of the pressure gauge. The plug is inserted into the power supply side, and the signal line on the interface 42 side is connected to the product line inspection terminal 20.

Next, No. The procedure proceeds to step 3, where the inspection operator presses the automatic inspection start button on the personal computer 41 side. Then, No. 4 to No. 4. Inspection proceeds automatically by exchanging signals between the personal computer 41 and the control unit 5 until 23. This No. 4 to No. 4. Nos. In response to the sensor cancel command issued in the procedure of No. 8, the management circuit 38 sets the No. The operation state is set in the procedure of 9, and the transistor 40 is turned on. By the operation of the management circuit 38, the CO concentration integrating safety circuit 29 by the CO sensor is used.
And the operation of the compulsory safety circuit 30 does not shut off the gas solenoid valve 17, regardless of the generated CO concentration.
The inspection proceeds smoothly.

No. In the procedure up to 23, inspections other than the operation of the CO sensor 7 have been completed. The operation state of the CO sensor 7 is inspected in the procedure after 24. Along with this,
The management circuit 38 is no. When the operation in step 23 is completed, the output of the ON drive signal to the transistor 40 is stopped. procedure
At 24, the inspection worker applies the exhaust closing member 44 to the exhaust port 43 of the water heater 1 as shown in FIG. This exhaust blocking member
44 are provided in two types. The first A member has a large diameter of the donut-shaped center hole 45, and the second B member has a small diameter of the center hole 45.

First, an exhaust closing member A which is a first member having a large diameter is attached. By attaching this exhaust closing member A, the exhaust port 43 is closed somewhat, so that the combustion state deteriorates. However, since the center hole 45 is large, the CO concentration does not reach the dangerous concentration, and the gas solenoid valve 17 A state in which it is not interrupted by the CO concentration integrating safety circuit 29 or the compulsory safety circuit 30 is maintained. No. Blood hemoglobin C calculated from the sampling CO concentration from the personal computer 41 in the procedure of 25
O concentration ER and integrated value TR of blood hemoglobin CO concentration
The controller 5 sends back the ER and TR values obtained by the CO concentration integration safety circuit 29.

Next, No. In step 27, the inspection worker attaches the jig B of the exhaust closing member 44 having the small center hole 45 to the exhaust port 43. When the jig B is attached, the amount of blockage of the exhaust port 43 increases, and the combustion state of the burner 3 deteriorates.
As a result, the CO concentration in the exhaust gas increases and exceeds the dangerous concentration. As a result, the concentration integration safety circuit 29 operates and the gas solenoid valve 17 is shut off. The inspector confirms that the burner 3 has stopped burning in step 28, and confirms that the CO sensor 7 is operating normally.

In the water heater of the present embodiment, when the CO concentration integrating safety circuit 29 and the compulsory safety circuit 30 detect the dangerous concentration and stop the combustion, the hot water supply operation is not accepted in the state as it is and after 4 hours, While the water heater 1 is not operating, the water heater 1 is locked so as not to start the operation, and a clear switch 23 is provided to release the locked state. In step 31, the inspection operator operates the clear switch 23 to release the locked state of stopping the combustion. And No. After confirming that the water heater 1 operates normally in the procedure of No. 32, remove the power plug and the pipes of water and gas. By discharging the water heater 1 together with the pallet from the inspection table in the procedure of 34, all the inspections of the water heater 1 are completed.

According to the present embodiment, the management circuit 38 operates when an item other than the inspection of the CO sensor 7 is inspected, and the generated CO is generated.
Because the gas solenoid valve 17 is not shut off irrespective of the concentration, the CO safety circuits 29 and 30 are activated due to the deterioration of combustion that occurs during the inspection process, and the combustion stops and inspection cannot be performed. And the inspection of the water heater 1 can be performed smoothly.

Next, a second embodiment of the present invention will be described. In the first embodiment, the control mode is switched to the inspection mode by introducing the external inspection program of the personal computer 41 to the inspection interrupt mode of FIG. 1 through the product line inspection terminal 20. In the embodiment of the present invention, the manual switch of FIG. 1, that is, the setting mode changeover switch of FIG. 3 is manually operated and its switch signal is input to the manual interrupt mode of FIG. 1, and the control mode is changed from the control mode to the inspection mode by the manual switch signal. It is designed to be switched. In the case of the second embodiment, the inspection program is
Although it may be introduced from outside using 41 or the like, an inspection program may be given to the control unit 5 in advance. In this case, the water heater 1 can be inspected simply by operating the manual switch 21 to switch the control mode to the inspection mode, and the product line inspection terminal 20 can be omitted.
Also, after installing and constructing the water heater 1 at the destination, the water heater 1
Inspection can be performed only by operating the manual switch 21, so that maintenance and other operations can be performed reliably and easily.

In this embodiment, the inspection program of the external personal computer is provided in the microcomputer of the device.
In the case of this embodiment, a product line inspection terminal connecting the external personal computer and the device microcomputer is unnecessary, and of course, a switch is provided on the device control board, which does not require the connection itself, so as to be in the inspection mode. In this case, the coordination with the external personal computer is adjusted according to the time schedule from when the external personal computer turns on the water solenoid valve shown in FIG. When the external personal computer turns on the water solenoid valve, water flows into the equipment. When the water flow sensor of the equipment detects this, and the inspection mode switch is turned on, the inspection program is run according to the same time schedule as the external personal computer. It is. The inspection program at this time is almost the same as that shown in the first embodiment. No. 4 to 5 are not performed. Step 5 is the operation switch of the remote control
Is turned on manually, and the procedure 11 is not shown as it is merely to confirm that a human is displayed on the remote controller.

In each of the above embodiments, a monitor lamp 46 is connected to the control unit 5 as shown in FIG. Next, the functional operation of the monitor lamp 46 will be described. When the water heater 1 is turned on, the CO sensor 7
Then, heat cleaning of the CO sensor 7, operation confirmation of the CO sensor 7, and the like are performed. It takes about 40 seconds for these heat cleaning and operation confirmation work. During this time, the monitor lamp 46 does not turn on, the hot water supply operation of the water heater 1 is not accepted, and the monitor lamp 46 turns on after 40 seconds, Water heater 1 is ready for hot water supply operation.

Also, when the integrated value TR of the hemoglobin CO concentration in the blood of the CO concentration integrating safety circuit 29 is 0.7, 0.8, 0.9, etc., which is smaller than the dangerous concentration of 1.0, the monitor lamp is turned off. The blinking operation of 46 is performed, the electronic buzzer (not shown) sounds for 20 seconds, and the water heater 1
And the error code is displayed on the remote controller 26.

In the case of the pre-combustion stop of the water heater 1, after stopping the combustion, the faucet is closed and opened again, or the remote controller 26 is turned off and then turned on again, or the power plug is connected and disconnected. Thus, the hot water supply combustion sequence program is reset, and the hot water supply operation is enabled. The status of this preliminary combustion stop is indicated by the monitor lamp.
It can be known by the blinking of 46, and the user can use the water heater again by the reset operation.

On the other hand, when the integrated value TR of blood hemoglobin CO concentration obtained by the CO concentration integration safety circuit 29 reaches the dangerous concentration of 1.0, the gas valve is shut off and the combustion operation is stopped. Sometimes the monitor lamp 46
Is turned off, the electronic buzzer sounds for 20 seconds, and an error code is displayed on the remote controller 26. The display mode is different from the flashing display at the time of preliminary combustion stop, so that a dangerous state is distinguished. In the case of this dangerous stop, the stop state of the hot water supply operation is not released by the reset operation at the time of the preliminary combustion stop, and the wait time of 4 hours or the operation of the clear switch 23 inside the appliance is not performed. And the stop state of the hot water supply operation cannot be released, and the clear switch 23 is provided in the control unit 5 in the appliance case 2, so that the user cannot normally operate the clear switch 23. The clear switch 23 is operated by a specialized repair staff when performing repair.

The monitor lamp 46 is designed to blink in response to the switch signal of the filter switch 6. When the monitor lamp 46 is blinking during the combustion operation, the filter 8 is not attached, or Even if it is attached, it is possible to know that the filter 8 is not attached at the correct position, and prompts the filter 8 to be attached correctly.

Further, in this embodiment, even when a stable CO detection signal is not output from the CO sensor 7, a CO gas having a CO concentration lower than the detectable limit of the CO sensor 7 is generated. It is assumed that this low level CO concentration is, for example, 1000 ppm, and when exposed to an atmosphere having this estimated CO concentration, the human hemoglobin C
The time when the O concentration reaches the dangerous concentration is set to, for example, 60 minutes,
The combustion operation is stopped when the set time is reached, but also in this case, when the combustion is stopped, a blinking display of the monitor lamp 46 is performed to notify the user of the fact. I have to. This combustion stop is handled in the same manner as the preliminary combustion stop, and the hot water supply operation can be restarted by a reset operation.

Note that the present invention is not limited to the above-described embodiment, but can adopt various embodiments. For example, in the above embodiment, the case where the abnormality detection sensor is the CO sensor 7 has been described. However, this abnormality detection sensor may be an abnormality in the hot water supply operation such as a temperature prevention fuse provided in the water heater or a flame rod electrode for detecting misfire. May be another sensor for detecting.

In the above embodiment, the control circuit 38 does not accept the signal of the CO sensor 7 in the inspection mode and ignores the signal of the CO sensor. However, the signal of the sensor may be accepted. Good. In this case, even if the signal of the CO sensor 7 is received, the gas valve (gas solenoid valve 17) may be forcibly turned on in another circuit so that the combustion operation is not stopped. The concept of ignoring and ignoring is used in a broad sense to ignore or cancel the signal of the abnormality detection sensor, such as ignoring or canceling the signal of the abnormality detection sensor, losing the effectiveness of the signal on the sensor side with another signal are doing.

Further, in the first embodiment, the personal computer having the inspection program and the control unit 5 of the water heater are connected using the product line inspection terminal to transmit and receive signals.
This may be performed wirelessly or in a non-contact manner such as by using an electric field.

Furthermore, in the present invention, an example has been described in which the gas valve is controlled by controlling the drive signal of the gas valve. For example, a transistor 37 is provided in the signal section from the flow sensor to the CPU to provide the flow sensor. The present invention may be used in a circuit in which a gas valve is indirectly operated by controlling a signal from the controller.

[0045]

Further, in the above-described embodiment, the description has been made by taking a water heater as an example. However, the present invention can be applied to a combustion type device such as a bath cooker and a heater other than the water heater, and further detects an abnormal operation other than the combustion type. The present invention is applied to various other devices such as electric appliances and mechanical devices that stop operation in response to a signal from an abnormality detection sensor.

Further, in the above-mentioned embodiment, as shown in FIG. 5, a short circuit which is short-circuited when a terminal is inserted is formed in the product line inspection terminal 20 or a terminal to be connected, and a hard-wired circuit is provided when the terminal is connected. The mode may be switched to the inspection mode by hardware. Alternatively, the same operation as the clear switch may be performed by connecting or disconnecting the terminal.

[0048]

According to the present invention , at least the abnormality detection signal is output by the sensor signal management circuit during the inspection mode other than the inspection of the abnormality detection sensor in the inspection mode.
The device is configured to ignore the abnormal detection signal from the abnormal detection sensor during the inspection operation that causes trouble in the inspection of the device.
In testing process other than inspection of abnormality detecting operation of the sensor, different
Even if an abnormality detection signal is output from the normal detection sensor, it is possible to prevent the safety stop function from working and stopping the device, and to hinder inspection other than inspection of the abnormality detection operation of the abnormality detection sensor. It can be performed smoothly without.

Further, an abnormality detection sensor is provided by the management circuit.
At least an abnormality detection signal other than the inspection of the abnormality detection operation of
Inspection is hindered by equipment stoppage
In the process, the abnormality detection signal of the abnormality detection sensor is automatically excluded, and the inspection of the abnormality detection operation of the abnormality detection sensor is automatically performed.
Dynamically ignores and excludes the abnormality detection signal of the abnormality detection sensor
Runode to release an operation that enables automatic inspection of the safety stop function with equipment, compared with the conventional manual inspection, it is possible to greatly increase the work efficiency of inspection.

[0050] Further, those of structure in which the switching means of the control mode and the inspection mode, the repair worker can perform repair work after the test mode by operating the switching means, the abnormality detecting sensor Safety stop machine by
An error is detected from the error detection sensor during
The device does not stop due to the output of the detection signal , and repair work becomes very easy.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of an embodiment of the present invention.

FIG. 2 is a configuration explanatory view showing a first embodiment of the present invention.

FIG. 3 is an explanatory diagram of a connection mode of a control unit of the embodiment.

4 is an explanatory diagram of a CO safety stop function circuit of the embodiment.

FIG. 5 is an explanatory diagram of a terminal short circuit.

[Explanation of symbols]

 1 Water heater 7 CO sensor 17 Gas solenoid valve 29 CO concentration integrated safety circuit 30 Forced safety circuit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-118018 (JP, A) JP-A 1-144645 (JP, U) JP-A 56-121968 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) F23N 5/24 107 F23N 5/26 101

Claims (3)

(57) [Claims] An abnormality detection sensor for detecting an operation abnormality is provided. An operation of the device is controlled in a control mode in response to an abnormality non-detection signal of the abnormality detection sensor, and the operation of the device is controlled based on the abnormality detection signal from the abnormality detection sensor. in safety stop function equipped device to stop, with an inspection mode for inspecting operations in accordance with another to the inspection program of the control mode, to the test mode
Oite the abnormality abnormality detection signal from the abnormality detection sensor during inspection operation other than inspection of abnormality detection operation of the detection sensor management circuit ignores excluded sensor signal is provided, the management times
For the road, the inspection operation of the inspection program is other than the abnormality detection operation
At least automatically when starting the inspection operation
It has a function to ignore and exclude the abnormality detection signal from the detection sensor.
However, when inspecting the abnormality detection operation of the abnormality detection sensor,
Dynamically ignore and exclude the abnormality detection signal from the abnormality detection sensor
Safety stop function with equipment according to the sensor signal, characterized in Rukoto which have a function of canceling the operation that. 2. The device according to claim 1, further comprising means for switching between a control mode and an inspection mode. 3. The device with a safety stop function based on a sensor signal according to claim 1, wherein the inspection program is provided from outside the device, and the device is provided with an input terminal for receiving the inspection program from the outside.