JP3338184B2 - Analog input / output board test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an analog-to-digital conversion circuit in a plant control apparatus which performs control using digital signals, and more particularly to an analog input / output board test apparatus for checking the output accuracy of analog input and analog output boards. About.

[0002]

2. Description of the Related Art In a plant control device (digital control device) that performs control using digital signals, process values such as a flow rate and a pressure are input in order to grasp a plant state.
The input process value is converted into an analog input signal such as a voltage and a current by a detector, and then converted into a digital signal corresponding to the input analog signal level by an analog input substrate forming an analog input circuit of the digital controller. Conversion (A / D conversion) is used for logic processing.

In a digital control device, it is necessary to output a control signal to a controller or the like in order to control a plant. At this time, a digital value for control forms an analog output circuit by the digital control device. The analog output board converts (D / A converts) the analog value into an analog output signal such as a voltage and a current corresponding to the digital value, and is used for controlling a controller or the like.

In a control device of a plant including a digital control device, an analog input test for confirming that an accuracy of an analog input board is within a specified value and an accuracy of an analog output board are within a specified value as test items. There is an analog output test to make sure.

[0005] FIG. 12 is a block diagram showing an example of a conventional test apparatus for performing an analog input test on an analog input board.
An electric signal (voltage, current) corresponding to the process amount of the plant is input through the external cable 2. The external cable 2 is connected to a board wiring 4 via a terminal block 3,
The board wiring 4 is connected to an analog input board 5.

The electric signal input to the digital controller 1 is converted (digital / analog conversion, hereinafter abbreviated as A / D conversion) into a digital signal (count value) corresponding to the voltage value on the analog input board 5. Then, the logic processing board 6 is used for logic processing for controlling the plant. The analog input test performed here is for confirming the accuracy of the A / D conversion performed on the analog input board 5.

At the time of the analog input test, the board wiring 4 is detached from the analog input board 5, and the board cable 7 is connected to the analog input board 5 instead. Thus, a test signal simulated and output by the voltage / current generator 9 via the test terminal block 8 is input to the analog input board 5. The voltage or current value of the test signal is confirmed by the digital multimeter 10.

Further, a data input / output cable 11 is connected to the logic processing board 6, a maintenance tool 12 is connected thereto, and the analog input board 5 checks the count value obtained by A / D conversion of the test signal.

The analog input board 5 as a result of this test
The accuracy of A / D conversion in is evaluated by the error of the actual count value with respect to the reference count value corresponding to the input test signal level, so the tester calculates the error after checking the count value and checks the accuracy. We will proceed with the test.

On the other hand, an analog output test for a conventional analog output board is performed by the analog input board 5 shown in FIG.
Is replaced with an analog output board. That is, an analog output board (not shown) converts a count value, which is a digital signal, into an electric signal (analog) corresponding to a digital value (digital / analog conversion, hereinafter abbreviated as D / A conversion).

Therefore, when testing the analog output board, the logic processing board 6 is connected to the data input / output cable 11.
And the maintenance tool 12 are connected to output a count value of the test signal, and an analog electric signal obtained by D / A conversion of the test signal using an analog output board is confirmed using the digital multimeter 10 or the like.

Also, the D / A performed on the analog output board
The accuracy of the conversion is evaluated based on the error between the actual electrical signal reading and the reference electrical signal corresponding to the count value of the test signal.Therefore, the tester calculates the error after confirming the electrical signal value and determines whether the accuracy is good or bad. The test was proceeding while checking.

[0013]

When performing an analog input / output test for each board provided in the digital control device,
If the model of the board under test is different from the board type of the data sheet, or if the test equipment is connected to an actual board that is not the subject of the test, an improper voltage or current may be applied to the actual board, causing damage. There was a problem that there is.

Further, when performing an analog input / output test, after a tester confirms a simulated data value for the test, the tester must perform an output operation using the simulated data value as a test signal. After confirming the above, the accuracy calculation is performed by the tester, so that the load on the tester is increased, and there is a problem that the test work is speeded up and the reliability tends to be lowered.

It is an object of the present invention to provide various data bases for each board provided in a digital control device, to form a test board and an electric circuit of a test apparatus, to establish a connection, to set a test signal to be simulated, and to set up a test signal. An object of the present invention is to provide an analog input / output board test apparatus for evaluating test results.

[0016]

According to the first aspect of the present invention, there is provided an analog input / output board test apparatus for converting a large number of analog signals provided to a digital controller into digital signals. And an analog input / output board test apparatus that performs a function test of an analog output board that converts a digital signal into an analog signal.
Switching means for connecting to the digital control device to form an electric circuit corresponding to each of the boards to be tested and test contents; signal generating means for outputting a test signal to each of the boards to be tested; Input / output signal measuring means, a standard resistor to be inserted into an electric circuit, and various databases relating to the respective boards, the test signals and the input / output signals of the respective boards being input, and the switching means being provided in accordance with the test content. And an arithmetic processing means for setting an electric circuit with the test target board, confirming the connection, setting a test signal in the signal generating means, evaluating a conversion function in the test target board, and the like.

An analog input / output board test apparatus according to the present invention is provided in a digital controller or the like, and converts an analog signal input from a detector or the like into a digital signal and outputs the digital signal. In the analog input test for confirming the above, the conversion accuracy of the analog input board is measured by inputting both the analog signal input to the analog input board and the digital signal output.

According to a third aspect of the present invention, there is provided an analog input / output board testing apparatus provided in a digital controller or the like for converting a digital signal into an analog signal in order to output a control signal to a controller or the like. In the analog output test for confirming the conversion function, the conversion accuracy of the analog output board is measured by inputting both the digital signal input to the analog output board and the analog signal output from the analog output board.

According to a fourth aspect of the present invention, there is provided the analog input / output board test apparatus, wherein the analog input / output board test apparatus stores a location of the analog input board to be tested, a type of the board, and an input location of the analog signal. During the test, the data of the installation location of the analog input board to be tested, the type of the board, and the input location of the analog signal are input, and the matching with the database is confirmed.

According to a fifth aspect of the present invention, in the analog input / output board test apparatus, the installation location of the analog output board to be tested, the type of the board, and the output location of the analog signal are stored in the analog input / output board test apparatus. A database is provided, and at the time of the test, data on the installation location of the analog output board to be tested, the type of the board, and the output location of the analog signal are input to confirm the match with the database.

According to a sixth aspect of the present invention, in the analog input / output board test apparatus, the upper and lower limits of the input analog signal for each board type and the upper and lower limits of the converted output digital signal. And automatically sets an analog test signal value according to the type of the test target substrate.

According to a seventh aspect of the present invention, in the analog input / output board test apparatus, the upper and lower limits of the output digital signal for each board type and the upper and lower limits of the output analog test signal after the conversion. A database storing a range is provided, and a digital test signal value is automatically set according to a model of a test target board.

According to an eighth aspect of the present invention, there is provided the analog input / output board test apparatus, wherein the analog input / output board test apparatus includes an electric circuit connection for connection confirmation, an analog signal value for connection confirmation, and With the database that stores the digital signal values of, the digital signal data after the automatic formation and automatic setting of the analog signal value for connection confirmation and automatic conversion of the analog signal value for connection confirmation according to the type of the test target board, and It is characterized in that it matches with a database and automatically checks the connection of an electric circuit between an input point of an analog signal and a test apparatus.

According to a ninth aspect of the present invention, in the analog input / output board test apparatus, the analog input / output board test apparatus uses an analog input / output board test apparatus to check the connection of an electric circuit between an analog signal input portion and the test apparatus. A digital control device or the like characterized in that the connection confirmation electric circuit and the connection confirmation input analog signal are set so that the voltage and current value applied to the input board do not exceed the input allowable value of the analog input board. An analog input board that converts an analog signal input from a detector or the like into a digital signal and outputs the digital signal. In an analog input test for confirming the conversion accuracy, the analog signal input to the analog input board and the digital signal output are output. It is characterized in that both are input and the conversion accuracy of the analog input board is measured.

According to a tenth aspect of the present invention, in the analog input / output board testing apparatus, the analog input / output board testing apparatus is configured to control the switching means and control the signal generation means based on various databases relating to each board provided in the arithmetic processing means. The test of each board is sequentially performed by changing the test signal output of the above.

[0026]

According to the first aspect of the present invention, the arithmetic processing means having various databases relating to each board to be tested connects each board to be tested in the digital controller and the testing apparatus by a switching means and confirms connection. Form an electrical circuit,
A test signal for connection confirmation is added from the signal generation means to confirm whether the connection is proper.

Next, an electric circuit for confirming the board function is formed on the board to be tested by the switching means, a test signal for confirming the board function is added from the signal generating means, and the output of the board to be tested corresponding to the test signal is outputted. Measure by measuring means. This measurement result is compared with a reference value in the database to evaluate the conversion accuracy of the substrate.

According to a second aspect of the present invention, an analog signal input to an analog input board to be tested and a digital signal converted and output by the analog input board are input, and the conversion accuracy of the analog input board is determined. Is calculated from the error of.

According to a third aspect of the present invention, a digital signal input to an analog output board to be tested and an analog signal converted and output by the analog output board are input, and the conversion accuracy of the analog output board is determined. Is calculated from the error of.

According to a fourth aspect of the present invention, at the time of testing an analog input board, the location of the analog input board, the type of the board and the input location of the analog signal in the database provided in the analog input / output board test apparatus, A comparison is made between the installation location of the analog input board input from the analog input board and the data of the board type and the input location of the analog signal to detect inconsistency, thereby preventing breakage of the board due to a difference in board type or the like.

According to a fifth aspect of the present invention, at the time of testing an analog output board, the installation location of the analog output board to be tested, the board type, and the output location of the analog signal in the database provided in the analog input / output board testing apparatus. , Comparing the installation location of the analog output board input from the analog output board under test with the data of the board type and the output location of the analog signal to detect a mismatch,
Prevents damage to the substrate due to differences in substrate type and the like.

According to a sixth aspect of the present invention, there is provided an analog input / output board test apparatus, wherein various databases relating to each board to be tested provided in the analog input / output board testing apparatus include upper and lower limits of an input analog signal for each board type of the board to be tested, The upper and lower limits of the output digital test signal are stored, and the database automatically sets the analog test signal value according to the type of the test target board.

According to a seventh aspect of the present invention, there is provided an analog input / output board testing apparatus, wherein various databases relating to each board to be tested provided in the analog input / output board testing apparatus include upper and lower limit ranges of output digital signals for each board type of the board to be tested, The upper and lower limits of the output analog test signal are stored, and a digital test signal value corresponding to the type of the test target board is automatically set by using this database.

The invention according to claim 8 is characterized in that the analog input / output board test apparatus includes a connection confirmation electric circuit, a connection confirmation analog signal value for each board type, and a database storing converted digital signal values. Along with automatic formation of an electric circuit for connection confirmation and automatic setting of an analog signal value for connection confirmation in accordance with the type of the test object board, input of digital signal data converted by the test object board to confirm a match with the database. Thereby, the connection of the electric circuit between the input portion of the analog signal and the test apparatus is automatically confirmed, and the damage to the board due to the connection to a board other than the board to be tested is prevented.

According to the ninth aspect of the present invention, in the analog input / output test, the voltage and current applied to the analog input board are checked in order to check the connection of the electric circuit between the input portion of the analog signal and the test apparatus. By setting the connection confirmation electric circuit and the connection confirmation input analog signal so as not to exceed the input allowable value of the analog input board, the board is prevented from being damaged by the connection confirmation operation.

According to a tenth aspect of the present invention, according to a command from various databases relating to each substrate provided in the arithmetic processing means,
A plurality of boards are sequentially switched to form and confirm a circuit for connection confirmation corresponding to each board, and to automatically form a test circuit and perform a test for function confirmation.

[0037]

An embodiment of the present invention will be described with reference to the drawings. The same components as those of the above-described conventional technology are denoted by the same reference numerals, and detailed description thereof will be omitted. The block diagram of FIG. 1 shows a number of analog input boards and analog output boards provided in the digital control device 1.
The analog input board 5 is shown as an example.

The analog input / output board test apparatus 13 is connected to the analog input board 5 and the logic processing board 6 in the digital controller 1 via the board cable 7 and the data input / output cable 11 to convert the analog input board. Conduct a confirmation test.

This analog input / output board test apparatus 13 comprises:
As shown in the detailed block diagram of FIG. 2, a voltage / current generator 14 which is a signal generating means for outputting a test signal (voltage, current, etc.) simulating the input output of the board at the time of the test, and an input of the test signal A digital multimeter 10 as a measuring means for measuring an electric signal output from each substrate and a standard resistor 15 inserted into an electric circuit are provided.

Furthermore, a switch 16 as switching means for forming an appropriate electric circuit by switching contacts according to the test contents of the test target board, a terminal block 17 used to connect the board cable 7, and A computer that includes various databases for each board and controls the voltage / current generator 14, the digital multimeter 10, and the switch 16 to sequentially select a board to be tested, check the connection, and evaluate the conversion function from the test result. And an arithmetic processing unit 18 of arithmetic processing means.

The test circuit diagram of FIG. 3 shows the details of the electric circuit formed by the switch 16,
16 is a contact point 16a to a contact point under the control of the arithmetic processing unit 18.
16L is opened and closed, and the analog input / output board testing device 13 and the voltage input board 5 to be tested
a, the current input board 5b, the voltage output board 5c, and the current output board 5d are connected to each other.

FIG. 4 shows an example of a database provided in the arithmetic processing unit 18 used to control the contacts of the switch 16 according to the type and test state of each analog board. The contact states a to l in the middle correspond to the contacts 16a to 16l of the switch 16 in FIG.

The test set value diagram of FIG. 5 is also an example of a database, and shows set values of test signals and various data for evaluation according to each board type (model) and test contents. is there.

Next, the operation of the above configuration will be described. In the first embodiment, when the analog input test of the voltage input board 5a is performed, first, when the voltage input board 5a of "board type" shown in FIG. Switched by 18 controlled
Reference numeral 16 indicates that the contacts 16a, 16c, 16e, 16g, 16h, and 16j are closed as shown in the row of "confirmation of connection of the power input board" in FIG. At this time, the electrical circuit for connection confirmation formed in FIG. 3 is simplified as shown in the circuit diagram of FIG.

At this time, the standard resistor 15 is set to 100Ω. This is to prevent a large test signal exceeding the input allowable value of the board from being applied to damage the board even if the board is erroneously connected to another board not to be tested.

In this state, the voltage / current generator 14 outputs a voltage of 100 mV, which is the “set value of analog signal for connection confirmation” in FIG. 5, as a test signal for connection confirmation. As a result, each connected board has its own type (model)
Accordingly, the voltages and currents shown in equations (1) to (4) are applied to each substrate as shown in the following (a) to (d).

(A) When connected to the regular voltage input board 5a: applied voltage = 100 (mV) × 250 × 10 ³ (Ω) ÷ (100 (Ω) +
250 × 10 ³ (Ω)) = 99.96 (mV)… (1)

(B) When connected to the current input board 5b by mistake: applied current = 100 (mV) ÷ (100 (Ω) +50 (Ω)) = 0.667
(mA)… (2)

(C) In case of connection to the voltage output board 5c by mistake: applied current = 100 (mV) × 250 × 10 ³ (Ω) ÷ (100 (Ω) +
250 × 10 ³ (Ω)) = 99.96 (mV) ... (3)

(D) In case of connection to the current output board 5d by mistake: applied current = 100 (mV) ÷ (100 (Ω) +50 (Ω)) = 0.667
(mA)… (4)

In all of the above cases (a) to (d), the applied voltage and current values are both equal to or less than the "allowable analog signal for connection confirmation" shown in FIG. Also in the cases (b) to (d) described above, since the board is not damaged and the count value cannot be read, the connection errors (b) to (d) can be detected.

After the correct connection of the voltage input board 5a is confirmed by (a) as described above, the switch 16 is operated by the arithmetic processing unit 18 to switch the contacts 16a and 16c as shown in the "voltage input board test" row in FIG. , 16f, 16i are closed,
At this time, the test circuit formed in FIG. 3 is simplified as shown in the circuit diagram of FIG.

In this state, as the test signal from the voltage / current generator 14, a voltage of 5 V shown in FIG. 5 "upper limit of analog signal for analog input / output test" is output. The 5V test signal is input, the voltage input board 5a converts the digital value into a digital value, reads the output count value, and compares it with the 4000 count of Fig. 5 "Upper limit of count value for analog input / output test". By doing so, the error on the upper limit side is calculated.

Next, the voltage / current generator 14 generates a test signal as shown in FIG. 5 "Lower limit value of analog signal for analog input / output test".
The voltage of 0 V is output, the voltage input board 5a reads the count value converted and output as a digital value, reads the count value (confirms that the count becomes 0 at 0 V), and FIG. The error at the lower limit is calculated by comparing the lower limit of the count value with 0 count for the analog input / output test.

As a result, the arithmetic processing unit 18 checks the error between the upper limit value and the lower limit value, compares this error with the normal value of the voltage input board 5a stored in the database, and as a test result, obtains the conversion accuracy. Perform an evaluation.

Therefore, according to the present invention, connection and confirmation between the test apparatus and the voltage input board 5a, protection of the board against connection errors, and evaluation of the accuracy of the A / D conversion function by the test are automatically and quickly performed. be able to.

In the second embodiment, the analog input test of the current input board 5b is performed. First, the switch 16 is controlled by the arithmetic processing unit 18 and the switch 16 is checked as shown in FIG.
As shown in the row, contact points 16a, 16c, 16e, 16g, 16
h and 16j are closed. At this time, the circuit for confirming the connection shown in FIG. 3 is simplified as shown in the circuit diagram of FIG.

In this state, a voltage of 100 mV of “Analog signal set value for connection confirmation” of FIG. 5 is output from the voltage / current generator 14 as a test signal for connection confirmation. The voltages and currents shown in the following equations (5) to (8) of (e) to (h) are applied to the respective substrates.

(E) In case of connection to the voltage input board 5a by mistake: applied voltage = 100 (mV) × 250 × 10 ³ (Ω) ÷ (100 (Ω) +
250 × 10 ³ (Ω)) = 99.96 (mV)… (5)

(F) When connected to the normal current input board 5b: applied current = 100 (mV) V (100 (Ω) +50 (Ω)) = 0.667
(mA)… (6)

(G) When connected to the voltage output board 5c by mistake: applied current = 100 (mV) × 250 × 10 ³ (Ω) ÷ (100 (Ω) +
250 × 10 ³ (Ω)) = 99.96 (mV) ... (7)

(H) In case of connection to the current output board 5d by mistake: applied current = 100 (mV) m (100 (Ω) +50 (Ω)) = 0.667
(mA)… (8)

In all of the above cases (e) to (h), the voltage and current applied to each substrate are equal to or less than the "allowable analog signal for connection confirmation" shown in FIG. In the case of the incorrect connection (e), (g), or (h), the count value cannot be read, so that this can be detected as a connection error.

After confirming that the current input board 5b is correctly connected from the above (f), as shown in the row of "current input board test" in FIG.
16e, 16g, 16h, and 16j are closed, and the test circuit in FIG. 3 at this time is simplified as shown in the circuit diagram of FIG.

In this state, a current of 20 mA shown in FIG. 5 “upper limit of analog signal for analog input / output test” is output to current input board 5 b as a test signal from voltage / current generator 14.
The count value of the result of the A / D conversion by the current input board 5b is read, and this count value is compared with 4000 count which is the “upper limit value of the count value for the analog input / output test” in FIG. Calculate the error at.

Next, the voltage / current generator 14 outputs a 0 mA current as shown in FIG. 5 “Lower limit value of analog signal for analog input / output test” as a test signal, and a count value output by the current input board 5 b; An error on the lower limit side is calculated by comparing with the 0 count of “the lower limit value of the count value for analog input / output test” in FIG. The arithmetic processing unit 18 compares the error on the lower limit side and the error on the upper limit side with a database to evaluate the conversion accuracy of the current input board 5b.

In the third embodiment, the analog input test of the voltage output board 5c is performed. Since no voltage and current are applied from the board test apparatus 13 side, the operation of confirming the connection with the board test apparatus is omitted. The switch 16 closes the contacts 16a, 16f, and 16k as shown in the row of "voltage output board test" in FIG. At this time, the circuit for testing in FIG. 3 is simplified as shown in the circuit diagram of FIG.

In the test for the voltage output board 5c, the voltage / current generator 14 sets 4000 counts shown in FIG.
The output obtained by the D / A conversion in step c is read by the digital multimeter 10, and this voltage value is compared with 5V in FIG. calculate.

Next, the voltage / current generator 14 sets 0 count in FIG. 5 “Lower limit value of count value for analog input / output test”, and outputs the output of voltage output board 5c to a digital multimeter.
10, and compares this voltage value with 0V of FIG. 5 “Lower limit value of analog signal for analog input / output test” to calculate an error on the lower limit side. To evaluate the conversion accuracy of the voltage output board 5c.

In the fourth embodiment, the analog output test of the current output board 5d is performed. Since the voltage and current are not applied from the board test apparatus 13 side as in the case of the voltage output board 5c, the board test apparatus The switch 16 closes the contacts 16b, 16d, 16f, and 16l of the switch 16 as shown in the "current output board test" row in FIG. At this time, the test circuit of FIG. 3 is simplified as shown in the circuit diagram of FIG.

In the test for the current output board 5d, the voltage / current generator 14 sets 4000 counts in FIG. 5 "upper limit of count value for analog input / output test", and sets the current output board 5d.
The output obtained by the D / A conversion at d is read by the digital multimeter 10, and the current value is compared with the upper limit of 20 mA in FIG. Is calculated.

Next, the voltage / current generator 14 sets 0 count in FIG. 5 “Lower limit value of count value for analog input / output test”, and outputs the output of current output board 5d to a digital multimeter.
10, and compares this current value with 0 mA of FIG. 5 “Lower limit value of analog signal for analog input / output test” to calculate an error on the lower limit side, and an arithmetic processing unit together with the error on the upper limit side. At 18, the conversion accuracy of the current output substrate 5d is evaluated.

The various operations shown in the above-described first to fourth embodiments are based on the test order and installation location of each input / output board and the board type (type) in the database provided in the arithmetic processing unit 18 in advance. ) And input locations of analog signals, and data such as test signals and evaluation criteria illustrated in FIGS. 4 and 5.

Therefore, in the analog input / output board test apparatus 13, the database is compared with the data of the installation location of the board to be tested in the digital controller 1, the type of the board, and the input location of the analog signal and the like, and the test and evaluation are performed. Are automatically performed in sequence.

As a result, it is not necessary to connect the board cable 7 and the data input / output cable 11 for connecting each input / output board in the digital controller 1 to the analog input / output board test apparatus 13 each time. The burden on the personnel is reduced, and there is no erroneous operation or erroneous calculation, so that the reliability of the test results is increased and the test work is sped up.

[0076]

As described above, according to the present invention, when an analog input test and an analog output test are performed by the digital control device, the connection and confirmation between the analog input / output board test device and the board and the test signal to be simulated are performed. Automatic setting and calculation of board conversion accuracy.

As a result, breakage of the board due to connection errors or erroneous signal settings is prevented, and the accuracy of the test results is high. Further, the automation of the test operation has the effect of reducing the burden on the tester and improving the reliability.

[Brief description of the drawings]

FIG. 1 is a block diagram of an analog input / output test apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of an analog input / output board testing apparatus according to an embodiment of the present invention.

FIG. 3 is a test circuit diagram of one embodiment according to the present invention.

FIG. 4 is a switching control diagram of a switch according to an embodiment of the present invention.

FIG. 5 is a diagram showing test setting values according to an embodiment of the present invention.

FIG. 6 is a simplified circuit diagram for confirming connection of a voltage input board according to the first embodiment of the present invention.

FIG. 7 is a simplified circuit diagram of a voltage input board test according to the first embodiment of the present invention.

FIG. 8 is a simplified circuit diagram for checking connection of a current input board according to a second embodiment of the present invention.

FIG. 9 is a simplified circuit diagram of a current input board test according to the first embodiment of the present invention.

FIG. 10 is a simplified circuit diagram of a voltage output board test according to a third embodiment of the present invention.

FIG. 11 is a simplified circuit diagram of a current output board test according to a fourth embodiment of the present invention.

FIG. 12 is a block diagram of a conventional analog input test apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Digital control device, 2 ... External cable, 3, 17 ... Terminal block, 4 ... Wiring for board, 5 ... Analog input board, 5a ...
Voltage input board 5b Current input board 5c Voltage output board 5d Current output board 6 Logic processing board 7
Board cable, 8 ... Test terminal block, 9, 14 ... Voltage / current generator, 10 ... Digital multimeter, 11 ... Data input / output cable, 12 ... Maintenance tool, 13 ... Analog input / output board test equipment, 15 ... Standard Resistance, 16: switch, 16a to 16l: contact, 18: arithmetic processing unit.

Claims (10)

(57) [Claims] 1. An analog input / output board test apparatus for performing a function test of an analog input board for converting an analog signal into a digital signal and an analog output board for converting a digital signal into an analog signal, the apparatus being provided in a digital controller. A switching unit connected to a digital controller to form an electric circuit according to each of the boards to be tested and the test content; a signal generating unit to output a test signal to each of the boards to be tested; and Input / output signal measuring means, a standard resistor to be inserted into an electric circuit, and various databases relating to the respective boards are provided, and the test signal and the input / output signals of the respective boards are inputted, and the switching means is provided in accordance with the test content. Formation of an electric circuit with a test target board, confirmation of connection, setting of a test signal in the signal generation means, and evaluation of a conversion function in the test target board. An analog input / output board test apparatus, comprising: an arithmetic processing means for performing a value operation and the like. 2. An analog input board for converting an analog signal input from a detector or the like provided in a digital control device or the like into a digital signal and outputting the digital signal and confirming a conversion function of the analog input board. 2. The analog input / output board test apparatus according to claim 1, wherein both the analog signal to be output and the digital signal to be output are input and the conversion accuracy of the analog input board is measured. 3. An analog output board provided in a digital control device or the like for testing a conversion function of an analog output board for converting a digital signal into an analog signal in order to output a control signal to a controller or the like. 2. The analog input / output board testing apparatus according to claim 1, wherein both the input digital signal and the output analog signal are input and the conversion accuracy of the analog output board is measured. 4. An analog input / output board test apparatus, comprising: a database storing an installation location of an analog input board to be tested, a type of the board, and an input location of an analog signal; 2. The analog input / output board test apparatus according to claim 1, wherein data of a location, a board type, and an input location of an analog signal is input to check the match with the database. 5. The analog input / output board testing apparatus according to claim 1, further comprising a database storing a location of the analog output board to be tested, a type of the board, and an output location of the analog signal. 2. The analog input / output board test apparatus according to claim 1, wherein data of the location, the type of the board, and the output location of the analog signal are input to confirm the match with the database. 6. The analog input / output board test apparatus according to claim 1, further comprising a database storing upper and lower limits of an input analog signal and upper and lower limits of a converted output digital signal for each board type. 2. The method according to claim 1, wherein the analog test signal value is automatically set.
The described analog input / output board test apparatus. 7. An analog input / output board test apparatus, comprising: a database storing upper and lower limits of an output digital signal for each board type and upper and lower limits of an output analog test signal after conversion. 2. The analog input / output board test apparatus according to claim 1, wherein a digital test signal value according to the setting is automatically set. 8. An analog input / output board test apparatus, comprising: a database storing a connection confirmation electric circuit connection, a connection confirmation analog signal value, and a converted digital signal value for each board type. Automatic formation of an electric circuit for connection confirmation according to the above, automatic setting of the analog signal value for connection confirmation and input of the converted digital signal data to confirm the match with the database, and the input position of the analog signal and the test equipment 2. The analog input / output board testing apparatus according to claim 1, wherein the connection of the electric circuit between the analog input and output boards is automatically confirmed. 9. The analog input / output board test apparatus, wherein a voltage and a current value applied to the analog input board when confirming connection of an electric circuit between an input portion of an analog signal and the test apparatus are determined by the analog input / output board. 2. The analog input / output board test apparatus according to claim 1, wherein the connection confirmation electric circuit and the connection confirmation input analog signal are set so as not to exceed an input allowable value of the board. 10. In the analog input / output board test apparatus, the control of the switching means and the test signal output from the signal generation means are changed by various databases relating to each board provided in the arithmetic processing means to sequentially test each board. 2. The analog input / output board test apparatus according to claim 1, wherein the test is performed.