A method and system for testing a compressed air foam system

Abstract

The present invention discloses a test method and system for a compressed air foam system, which belongs to the technical field of fire extinguishing of power transmission and transformation facilities. The method comprises: obtaining the numerical value of the simulated state of the compressed air foam system; the simulated state of the compressed air foam system comprises the system startup state, the pump operation state, the compressor operation state and the fault triggering state; according to the numerical value of the simulated state of the compressed air foam system, based on the test unit, executing the control logic; the control logic is output to the compressed air foam system in the form of a virtual signal, simulating the signal operation state of the working condition, and obtaining the test result of the compressed air foam system; the test result of the compressed air foam system is fed back to the test unit, and the compressed air foam system and the test unit communicate data; interacting with the test unit through the host computer to control the signal operation state in real time and store data.

Description

Technical Field

[0001] The invention relates to the technical field of fire extinguishing of power transmission and transformation facilities, and in particular to a testing method and system for a compressed air foam system. Background Art

[0002] Power transformers and other equipment have large oil storage capacity, which may cause fire. Once a fire occurs, the burning will last for a long time and be difficult to extinguish. Generally, compressed air foam fire extinguishing system CAFS is used to extinguish fire. The compressed air foam fire extinguishing system introduces compressed air into the foam mixed liquid, which forms uniform and unbreakable foam after mixing. After release, it adheres to the surface of the burning object to form a foam coating. It has the advantages of uniform foam mixing, long liquid separation time, and high fire extinguishing efficiency.

[0003] The compressed air foam fire extinguishing system currently used in the project includes a foam supply device, a water supply device, an air supply device and a mixing device. The foam supply device is connected to the mixing device through a foam delivery pipeline, the water supply device and the pressure stabilizing device are connected to the mixing device through a water delivery pipeline, the mixing device is connected to the partition selection valve through a fire main pipeline, and pressurized water is pre-stored in the fire main pipeline; the partition selection valve is connected to the spraying device through a fire branch pipeline, and the control device is electrically connected to the foam supply device, the water supply device, the pressure stabilizing device, the air supply device and the partition selection valve.

[0004] Due to the complex system structure and control logic, the current system control logic test requires the equipment to be assembled, the pipes to be filled with water, and the system to be powered on for testing. After the test is completed, the system is disassembled and shipped to the project site. This requires a lot of manpower and a long test cycle. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a testing method and system for a compressed air foam system, which can test the compressed air foam system through a testing unit without requiring a large amount of manpower, material resources and time required for a full physical test, and has a simple control logic and high efficiency.

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0007] In one aspect, the present invention provides a method for testing a compressed air foam system, comprising:

[0008] Obtaining a numerical value of a simulated state of a compressed air foam system; the simulated state of the compressed air foam system includes a system startup state, a pump operation state, a compressor operation state, and a fault trigger state;

[0009] executing control logic based on a test unit according to the numerical value of the simulated state of the compressed air foam system;

[0010] Outputting the control logic to the compressed air foam system in the form of a virtual signal to simulate the signal operation state of the working condition and obtain the test result of the compressed air foam system;

[0011] Wherein, the test result of the compressed air foam system is fed back to the test unit, and the compressed air foam system and the test unit are in data communication;

[0012] The host computer interacts with the test unit to control the signal operation status in real time and store data.

[0013] Optionally, the test unit is executed in a preset periodic cycle;

[0014] All signals are sent and received in the form of communication via communication cables.

[0015] Optionally, when the value of the simulated state of the compressed air foam system is 0 and enters the 0 state for a first preset time, the test unit sets the manual control mode signal to 1, and after entering the 0 state for a second preset time, the test unit sets the manual start system signal to 1, detects the operating parameters of the compressed air foam system in the system start state and transmits them to the host computer, and the value of the simulated state of the compressed air foam system is increased by 1;

[0016] When the value of the simulated state of the compressed air foam system is 1 and after entering state 1 for the first preset time, the test unit sets the automatic control mode signal to 1. After entering state 1 for the second preset time, the test unit sets the remote start system signal to 1, detects the operating parameters of the compressed air foam system in the system start-up state and transmits them to the host computer, and the value of the simulated state of the compressed air foam system is increased by 1.

[0017] Optionally, when the value of the simulated state of the compressed air foam system is 2 and after entering state 2 for the first preset time, the compressed air foam system has been started, the test unit sets the pump operation signal to 1, detects the operating parameters of the compressed air foam system in the pump operation state and transmits them to the host computer, and the value of the simulated state of the compressed air foam system is increased by 1.

[0018] Optionally, when the value of the simulated state of the compressed air foam system is 3 and after entering state 3 for the first preset time, the pump has started, the test unit sets the compressor operation signal to 1, detects the operating parameters of the compressed air foam system in the compressor operation state and transmits them to the host computer, and the value of the simulated state of the compressed air foam system is increased by 1.

[0019] Optionally, when the value of the simulation state of the compressed air foam system is 4, the test unit sets the fault trigger signal to 1, detects the operating parameters of the compressed air foam system under the main program protection action and transmits them to the host computer.

[0020] On the other hand, the present invention provides a test system for a compressed air foam system, comprising: a test unit, a serial port module, a computer, a display device and a host computer;

[0021] The display device is connected to a computer, the computer is connected to the test unit via a serial port module, and the host computer is connected to the test unit;

[0022] The program to be tested of the compressed air foam system is written in ST language, and a test function module is embedded in the program to be tested of the compressed air foam system to obtain a test unit.

[0023] Optionally, the test unit includes a simulation state module, a system startup module, a pump operation module, a compressor operation module, a fault manufacturing module and a data interaction module;

[0024] The simulation state module is used to update the value of the simulation state of the compressed air foam system and execute the control logic;

[0025] The system startup module is used to send a system startup signal;

[0026] The pump operation module is used to send a pump operation signal;

[0027] The compressor operation module is used to send a compressor operation signal;

[0028] The fault manufacturing module is used to send a fault trigger signal;

[0029] The data interaction module is used to transmit the operating parameters of the compressed air foam system to the host computer.

[0030] Optionally, the data interaction module uses a 16-bit unsigned integer array to store abnormal variables of the compressed air foam system;

[0031] Among them, g_data_transport[1]~g_data_transport

[100] store the abnormal variables sent by the test unit to the host computer;

[0032] g_data_transport

[101] ~g_data_transport

[200] store the abnormal variables sent by the host computer to the test unit.

[0033] Optionally, the abnormal variable is sent and received between the test unit and the host computer at a signal one hundred times the actual value;

[0034] The abnormal variable is transformed from an integer to a floating point type on the host computer and then divided by fifty, and is displayed on the display device in the form of a floating point number.

[0035] Beneficial Effects

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention tests the compressed air foam system through a virtual test platform, executes corresponding control logic through a test unit and the numerical value of the simulated state of the compressed air foam system, and sends a virtual signal to simulate the operating state of the system, pump, and compressor of the compressed air foam system without connecting to an external device, so as to realize the test of the compressed air foam system without a physical object, and controls and monitors the current signal state at any time through a host computer, and stores data, without requiring a large amount of manpower, material resources and time invested in a full physical test, and the control logic is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Shown is a schematic flow chart of a method for testing a compressed air foam system of the present invention in one embodiment;

[0039] Figure 2 FIG. 1 is a flow chart of executing control logic A of the present invention in one embodiment;

[0040] Figure 3 FIG. 1 is a flow chart of an embodiment of the execution control logic B of the present invention;

[0041] Figure 4 FIG. 1 is a flow chart of an embodiment of the execution control logic C of the present invention;

[0042] Figure 5 FIG. 1 is a flow chart of an embodiment of the execution control logic D of the present invention;

[0043] Figure 6 The figure is a flow chart of the execution control logic D of the present invention in the second embodiment;

[0044] Figure 7 It is a schematic diagram of the flow chart of the execution control logic D of the present invention in the third embodiment;

[0045] Figure 8 Shown is a schematic structural diagram of a test system for a compressed air foam system of the present invention in one embodiment. DETAILED DESCRIPTION

[0046] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations on the technical solution of the present invention. The embodiments of the present invention and the technical features in the embodiments may be combined with each other unless there is a conflict.

[0047] The term "and / or" is only a description of the association relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " generally indicates that the related objects are in an "or" relationship.

[0048] Example 1

[0049] like Figure 1 As shown, this embodiment introduces a test method for a compressed air foam system, which specifically includes:

[0050] The numerical value of the simulated state of the compressed air foam system is obtained; the simulated state of the compressed air foam system includes a system startup state, a pump operation state, a compressor operation state and a fault trigger state.

[0051] According to the numerical value of the simulated state of the compressed air foam system, the control logic is executed based on the test unit. The test unit includes a plurality of logics, and the corresponding logic can be executed by detecting the numerical value of the simulated state of the compressed air foam system.

[0052] In this embodiment, the numerical value of the compressed air foam system simulation state can be 0, 1, 2, 3, 4, 5, 6; among which, 0 and 1 states correspond to the execution of control logic A, 2 state corresponds to the execution of control logic B, 3 state corresponds to the execution of control logic C, and 4, 5, 6 states correspond to the execution of control logic D.

[0053] Control logic A corresponds to the execution system startup state, control logic B corresponds to the execution pump operation state, control logic C corresponds to the execution compressor operation state, and control logic D corresponds to the execution fault trigger state.

[0054] like Figure 2 As shown, when the value of the simulated state of the compressed air foam system is 0, it corresponds to the 0 state. After 3 seconds, the test unit sets the manual control mode signal to 1. After 5 seconds, the test unit sets the manual start system signal to 1. At this time, the operating parameters of the compressed air foam system in the system start state are detected, and whether there is an abnormality is determined based on the operating parameters. The parameters are transmitted to the host computer, and the value of the simulated state of the compressed air foam system is increased by 1.

[0055] When the value of the simulated state of the compressed air foam system is 1, it corresponds to state 1. 3 seconds thereafter, the test unit sets the automatic control mode signal to 1. 5 seconds thereafter, the test unit sets the remote start system signal to 1. At this time, the operating parameters of the compressed air foam system in the system start-up state are detected, and whether there is an abnormality is determined based on the operating parameters. The parameters are transmitted to the host computer, and the value of the simulated state of the compressed air foam system is increased by 1 again.

[0056] At this time, the control logic A is executed, that is, the system startup state is executed, the operating parameters of the compressed air foam system in the system startup state are detected, and whether there is an abnormality is determined according to the operating parameters, and the abnormality detection results are transmitted to the host computer to store the abnormality detection results.

[0057] like Figure 3 As shown, when the value of the simulated state of the compressed air foam system is 2, it corresponds to state 2, and the system has started. After 3 seconds, the test unit sets the pump operation signal to 1. At this time, the operating parameters of the compressed air foam system in the pump operation state are detected, and whether there is an abnormality is determined based on the operating parameters. The parameters are transmitted to the host computer, and then the value of the simulated state of the compressed air foam system is increased by 1.

[0058] At this time, logic B is executed, that is, the pump operation status is executed, the operation parameters of the compressed air foam system in the pump operation status are detected, and whether there is an abnormality is determined according to the operation parameters, and the abnormality detection results are transmitted to the host computer to store the abnormality detection results.

[0059] like Figure 4 As shown, when the value of the simulated state of the compressed air foam system is 3, it corresponds to state 3, the pump has started, and after 3 seconds, the test unit sets the compressor operation signal to 1, detects the operating parameters of the compressed air foam system under the compressor operation state, determines whether there is an abnormality based on the operating parameters, and transmits it to the host computer, after which the value of the simulated state of the compressed air foam system is increased by 1.

[0060] At this time, executing logic C, that is, executing the compressor operating status, detects the operating parameters of the compressed air foam system under the compressor operating status, determines whether there is an abnormality based on the operating parameters, and transmits them to the host computer to store the abnormality detection results.

[0061] like Figure 5 As shown, when the value of the simulated state of the compressed air foam system reaches 4, corresponding to state 4, the test unit sends a set signal to the system power fault signal, that is, the system power fault signal is set to 1, so as to detect and record the operating parameters of the compressed air foam system under the main program protection action, determine whether there is an abnormality based on the operating parameters, and transmit it to the host computer, after which the value of the simulated state of the compressed air foam system is increased by 1.

[0062] like Figure 6 As shown, when the value of the simulated state of the compressed air foam system reaches 5, corresponding to state 5, the test unit sends a set signal to the main circulation flow ultra-low signal, that is, the main circulation flow ultra-low signal is set to 1, so as to detect and record the operating parameters of the compressed air foam system under the main program protection action, determine whether there is an abnormality based on the operating parameters, and transmit it to the host computer, after which the value of the simulated state of the compressed air foam system is increased by 1.

[0063] like Figure 7As shown, when the value of the simulated state of the compressed air foam system reaches 6, corresponding to state 6, the test unit sends a set signal to the output pump pressure ultra-low signal, that is, the output pump pressure ultra-low signal is set to 1, so as to detect and record the operating parameters of the compressed air foam system under the main program protection action, determine whether there is an abnormality based on the operating parameters, and transmit it to the host computer, after which the value of the simulated state of the compressed air foam system is increased by 1.

[0064] At this time, states 4, 5, and 6 all execute logic D, that is, execute the fault trigger state, detect the operating parameters of the compressed air foam system under the main program protection action, determine whether there is an abnormality based on the operating parameters, and pass it to the host computer to store the abnormality detection results.

[0065] The control logic is output to the compressed air foam system in the form of a virtual signal to simulate the signal operation state of the working condition and obtain the test result of the compressed air foam system.

[0066] In this embodiment, a virtual signal is sent to enable the compressed air foam system to simulate the operating status of the system, pump and compressor without connecting to external equipment, so as to realize the test of the compressed air foam system without the real object.

[0067] The test result of the compressed air foam system is fed back to the test unit, and the compressed air foam system and the test unit are in data communication with each other.

[0068] And the host computer interacts with the test unit to control the signal running state in real time and store data.

[0069] The compressed air foam system simulation state is executed according to a preset period cycle.

[0070] In this embodiment, the test unit may adopt a programmable logic controller (PLC) program test function unit FB_TEST. The PLC program test function unit FB_TEST is executed in a 500ms cycle and includes a number of control logics, which can be executed accordingly according to specific circumstances.

[0071] All signals are sent and received in the form of communication via communication cables, and there are no other signal lines other than the communication cables.

[0072] Example 2

[0073] like Figure 8 As shown, this embodiment introduces a test system for a compressed air foam system, including: a test unit, a serial port module, a computer, a display device and a host computer.

[0074] The display device is connected to a computer, the computer is connected to the test unit via a serial port module, and the host computer is connected to the test unit.

[0075] The PLC program to be tested of the compressed air foam system is written in ST language. Before each test, the file can be imported through software, and the test function module can be embedded in the PLC program to be tested of the compressed air foam system to obtain a test unit. After the test is completed, the test function module can be deleted. In this embodiment, the test unit can adopt the PLC program test function unit FB_TEST, and the test function module can adopt the FB_TEST function module.

[0076] In this embodiment, the compressed air foam system uses a PLC model of NARI PR100MG. The test system and the compressed air foam system share this PLC, and only the test function unit FB_TEST needs to be embedded in the PLC, without adding an additional programmable controller.

[0077] The serial port module adopts RS485 to USB serial port module. All signals are sent and received by communication, and there is no other signal line except the communication cable.

[0078] By installing SMARTPLC software on the computer to connect to the PLC, the PLC program test function unit FB_TEST can be added to the original PLC program.

[0079] The test unit includes multiple submodules, namely: simulation status module, system startup module, pump operation module, compressor operation module, fault manufacturing module and data interaction module. The multiple submodules are used to send out external signals required for system startup, pump operation, compressor operation, fault triggering and other working conditions, specifically:

[0080] The simulation state module is used to update the value of the simulation state of the compressed air foam system and execute the control logic.

[0081] The system startup module is used to send a system startup signal.

[0082] The pump operation module is used to send a pump operation signal.

[0083] The compressor operation module is used to send a compressor operation signal.

[0084] The fault creation module is used to send a fault trigger signal.

[0085] The data interaction module is used to transmit abnormal variables of the compressed air foam system to the host computer.

[0086] The data interaction module uses a 16-bit unsigned integer array to store abnormal variables of the compressed air foam system;

[0087] Among them, g_data_transport[1]~g_data_transport

[100] store the abnormal variables sent by the test unit to the host computer.

[0088] g_data_transport

[101] ~g_data_transport

[200] store the abnormal variables sent by the host computer to the test unit.

[0089] The abnormal variable is sent and received between the test unit and the host computer at a signal one hundred times the actual value.

[0090] The abnormal variable is transformed from an integer to a floating point type on the host computer and then divided by fifty, and is displayed on the display device in the form of a floating point number.

[0091] The host computer can configure modbus through the host computer, including serial port configuration, baud rate configuration, data bit setting, stop bit setting, and parity setting. The meter and indicator light function of the host computer can display the flow pressure value under the test state in real time, including the current flow of the main circuit, the current temperature of the main circuit, the current pressure of the main circuit, the current flow of branch 1, the current temperature of branch 1, the current pressure of branch 1, the operating status of fire monitors 1-6, the operating status of sprinkler pumps 1-6, and the current status of the buffer tank level. And according to the needs, the trend of the variables to be monitored can be tracked in the configurable channel.

[0092] Run the PLC program and monitor and control it on the host computer, execute the control logic test of different links of the control program of the compressed air foam system, record the test data, and generate test records.

[0093] During the test execution, the software will record the process data and record it. When the use case test is completed, a test record will be automatically generated. When all the use cases required to be executed are completed, the data recording will stop.

[0094] Example 3

[0095] This embodiment introduces the specific experimental design steps of a test method for a compressed air foam system.

[0096] Turn on the compressed air foam system test system.

[0097] As shown in Table 1, perform the following configuration in the serial port configuration on the left side of the interface: select serial port number COM1, set the baud rate to 9600, set the data bit to 8, set the stop bit to 1, and set the parity bit to none.

[0098] Table 1 Test configuration

[0099]

[0100] Click the Mixing Device Test button at the bottom of the interface, and the icon light will light up. Do not select other tests.

[0101] Turn on all the DIP switches such as 'Start compressor' on the interface.

[0102] Click System Initialization.

[0103] Click Start Test, wait for the test to complete and the test results to pop up.

[0104] Table 2 shows the test items and test results in this embodiment.

[0105] Table 2 Test items and test results

[0106]

[0107] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0108] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0109] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0110] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0111] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A method for testing a compressed air foam system, characterized in that: include: Obtaining a numerical value of a simulated state of a compressed air foam system; the simulated state of the compressed air foam system includes a system startup state, a pump operation state, a compressor operation state, and a fault trigger state; executing control logic based on a test unit according to the numerical value of the simulated state of the compressed air foam system; Outputting the control logic to the compressed air foam system in the form of a virtual signal to simulate the signal operation state of the working condition and obtain the test result of the compressed air foam system; Wherein, the test result of the compressed air foam system is fed back to the test unit, and the compressed air foam system and the test unit are in data communication; Interacting with the test unit through a host computer to control the operating state of the signal in real time and store data; When the value of the simulated state of the compressed air foam system is 0 and enters the 0 state for the first preset time, the test unit sets the manual control mode signal to 1, and after entering the 0 state for the second preset time, the test unit sets the manual start system signal to 1, detects the operating parameters of the compressed air foam system in the system start state and transmits them to the host computer, and the value of the simulated state of the compressed air foam system is increased by 1; When the value of the simulated state of the compressed air foam system is 1 and enters the state 1 for the first preset time, the test unit sets the automatic control mode signal to 1, and after entering the state 1 for the second preset time, the test unit sets the remote start system signal to 1, detects the operating parameters of the compressed air foam system in the system start state and transmits them to the host computer, and the value of the simulated state of the compressed air foam system is increased by 1; When the value of the simulated state of the compressed air foam system is 2 and the compressed air foam system has been started after entering the 2 state for the first preset time, the test unit sets the pump operation signal to 1, detects the operating parameters of the compressed air foam system in the pump operation state and transmits them to the host computer, and the value of the simulated state of the compressed air foam system is increased by 1; When the value of the simulated state of the compressed air foam system is 3 and the pump has been started after entering the first preset time of state 3, the test unit sets the compressor operation signal to 1, detects the operating parameters of the compressed air foam system in the compressor operation state and transmits them to the host computer, and the value of the simulated state of the compressed air foam system is increased by 1; When the value of the compressed air foam system simulation state is 4, the test unit sets the fault trigger signal to 1, detects the operating parameters of the compressed air foam system under the main program protection action and transmits them to the host computer.

2. The method for testing a compressed air foam system according to claim 1, characterized in that: The test unit is executed in a preset periodic cycle; All signals are sent and received in the form of communication via communication cables.

3. A test system for a compressed air foam system, characterized in that: The test system is tested by the test method according to claim 1 or 2, and the test system comprises: a test unit, a serial port module, a computer, a display device and a host computer; The display device is connected to a computer, the computer is connected to the test unit via a serial port module, and the host computer is connected to the test unit; Writing a program to be tested for a compressed air foam system in ST language, embedding a test function module in the program to be tested for the compressed air foam system, and obtaining a test unit; The test unit includes a simulation state module, a system startup module, a pump operation module, a compressor operation module, a fault manufacturing module and a data interaction module; The simulation state module is used to update the value of the simulation state of the compressed air foam system and execute the control logic; The system startup module is used to send a system startup signal; The pump operation module is used to send a pump operation signal; The compressor operation module is used to send a compressor operation signal; The fault manufacturing module is used to send a fault trigger signal; The data interaction module is used to transmit the operating parameters of the compressed air foam system to the host computer.

4. The test system for the compressed air foam system according to claim 3, characterized in that: The data interaction module uses a 16-bit unsigned integer array to store abnormal variables of the compressed air foam system; Among them, g_data_transport[1]~g_data_transport[100] store the abnormal variables sent by the test unit to the host computer; g_data_transport[101]~g_data_transport[200] store the abnormal variables sent by the host computer to the test unit.

5. The test system for the compressed air foam system according to claim 4, characterized in that: The abnormal variable is sent and received between the test unit and the host computer at a signal one hundred times the actual value; The abnormal variable is transformed from an integer to a floating point type on the host computer and then divided by fifty, and is displayed on the display device in the form of a floating point number.

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