JPH03272984A - Control quantity output device of elevator - Google Patents

Abstract

PURPOSE:To relatively easily and economically output a desired control quantity as an analog quantity by supplying the digital bit information corresponding to a determined bit number to a digital-analog converter and outputting it as the analog quantity. CONSTITUTION:When a desired control quantity is wanted to output as an analog quantity, a microcomputer 20 reads in an address value on a RAM 23 in which the control quantity is stored and also the digital gain value of a determined coefficient value, and reads out the content of the digital control quantity from the location of the RAM 23 corresponding to the address value. The code multiplication of the read-out value with the digital gain is conducted, and an optional bit length of the determined multiplied value, or a bit length corresponding to the bit accuracy portion which is a determined bit number of a digital-analog converter 24 is supplied to the digital-analog converter 24, by which the bit length is converted to the analog value and outputed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention stores each control amount in a RAM using a computer, and digitally controls [Level 7 control amount] The present invention relates to an elevator control amount output device that outputs.

(Prior Art) Conventionally, in an elevator control device, as shown in FIG.
a to a speed control amplifier 3, which converts a position signal 5a from a position detector 5 coupled to an electric motor 4 driving the car 2 into a speed by a position/speed converter 6. The speed signal 6a thus generated is compared with the speed command signal 1a from the speed command generating device 1, and a current command 3a corresponding to the difference I5 is outputted and supplied to the current control amplifier 7.

This current control amplifier 7 uses the current command 3a and the electric motor 4.
The deviation from the current signal 8a of the current detector 8 that detects the current is calculated, and the load signal 9a from the unbalanced torque command device 9 is added to this deviation to output the power control signal 7a. is supplied to the power conversion device 10. The power conversion device 10 controls the power supplied to the electric motor 4 based on this power control signal 7a.

As a result, the electric motor 4 rotates the sheave 13, thereby moving the car 2 attached to the counterweight 1 at both ends of the main rope 12 wound around the sheave 13. ing.

The car 2 also has a landing device 14 . This implantation device 1
4 are landing detection plates 15A, 15.4 provided on each floor of the elevator hoistway. Detects the landing signal 14
a is supplied to the speed command generating device 1. The speed command generation device 1 outputs a speed command signal 1a based on this landing signal.

Furthermore, the car 2 has a load detector 16, and the load detector 1
6 supplies the load detection signal 16a to the unbalanced torque command device 9.

The unbalanced torque command device 9 generates a signal for correcting the unbalanced torque with the balance weight 11 and supplies it to the current control amplifier 7 .

In the elevator control device described above, the speed command generation device 1, the speed control amplifier 3, the position/speed converter 6, the current control amplifier 7, etc., shown surrounded by dotted lines in FIG. With the development of computers, digital control using microcomputers has been widely adopted for controlling elevators, and many of the above-mentioned devices have been replaced by microcomputers.

(Problem to be solved by the invention) Even with a digitally controlled elevator control device using a microcomputer, when adjusting or maintaining an elevator, it is necessary to control the control amount, which changes from moment to moment depending on the operation status of the elevator, in a non-digital way. There is a desire to check the status by outputting it in an analog manner, but in elevators that are digitally controlled using a microcomputer, each control amount is stored in a RAM etc. as a digital amount, so analog output is required. The problem is that it cannot be easily output as a quantity.

The present invention has been made in view of the above, and an object of the present invention is to provide a control amount output device that can easily output the digital control amount of an elevator that is digitally controlled using a computer as an analog amount. It is about providing.

[Structure of the invention]

(Means for solving the problem) In order to achieve the above object, the elevator control amount output device of the present invention outputs the control amount of the digitally controlled elevator while storing each control amount in the RAM using a computer. A controlled variable output device for an elevator, comprising: a digital-to-analog converter having a predetermined number of bits connected to a data bus of the computer; and input means for inputting designation information of a desired controlled variable to be output and a predetermined coefficient value. and reading means for reading out from the RA, M a digital control amount corresponding to the control amount designation information input from the input means, and a relationship between the digital control amount read by the reading means and the predetermined relationship. a multiplication means for multiplying by a numerical value, and control for controlling the digital-to-analog converter to output digital bit information corresponding to the predetermined number of bits of the multiplication result from the multiplication means as an analog quantity. The gist is to have the means.

(Function) In the elevator controlled variable output device of the present invention, a digital-to-analog converter with a predetermined number of bits is connected to the data bus of the combicoater, and designation information of a desired controlled variable to be output and a predetermined coefficient value are input. , reads the digital control amount corresponding to the specified information from the RAM, multiplies the read digital control amount by the coefficient value, and converts the digital bit information corresponding to a predetermined number of bits of this multiplication result into the digital-analog It is supplied to a converter and output as an analog quantity.

(Example) Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a block diagram showing the configuration of an elevator control device to which an elevator control amount output device according to an embodiment of the present invention is applied. The elevator control device shown in the figure includes the speed command generating device 1,
A speed control amplifier 3, a position/speed converter 6, and a current control amplifier 7 are configured by a microcomputer 20, and
The difference is that a digital-to-analog converter 24 for implementing the elevator controlled variable output device of the present invention is connected to the data bus 27 of the microcomputer 20, and the other configurations are the same as the device shown in FIG. Since they are the same, the same components are given the same reference numerals.

The microcomputer 20 includes a CPU 21 consisting of a microprocessor, and a data bus 27 of the CPU 21.
A ROM 22 that stores an arithmetic processing program for digitally controlling the elevators connected to the elevators, a RAM 23 that stores the results of the arithmetic processing, an input interface 25, an output interface 26, and an input interface 25 that is connected to the data bus 27 as described above. It is constructed of a relatively inexpensive digital-to-analog converter 24 having, for example, an 8-bit configuration.

Next, the operation of the elevator control amount output device according to an embodiment of the present invention will be explained with reference to the flowchart shown in FIG. In the elevator control system shown in FIG. 1, the control amount calculated by the microcomputer 20 is stored in digital form at a certain address in R, AM 23.

Therefore, when it is desired to output a certain desired controlled variable as an analog variable, the address value X on the RAM 23 where the controlled variable is stored is read from the outside as an input signal via the input interface 25 (step 110). Further, a digital gain value B, which is a predetermined coefficient value, is also read from the outside as an input signal via the input interface 25 (step 120). Then, content A, which is a digital control amount, is read from the location of the RAM 23 corresponding to the address value X (step 130). Then, sign multiplication is performed on the read value A and the digital gain B to obtain a multiplied value C (step 140).

This multiplication value C has a bit length twice that of the value read from the RAM 2S and the digital gain value B. That is, if the values of A and B are each, for example, 16 bits long, then the value C is 32 bits long.

An arbitrary bit length of the value of the multiplication value C obtained as above, that is, a bit length corresponding to the bit precision that is a predetermined number of bits of the digital-to-analog converter 24 is supplied to the digital-to-analog converter 24. , the converter converts it into an analog value and outputs it. Note that the position of the arbitrary bit length output in this case is a position predetermined in the device. That is, if the value of the multiplication result C is 32 bits long and the digital-to-analog converter 24 is of 8-bit format, the value is determined to be, for example, the lower half 8 bits of the upper 16 bits of the multiplication result. ing.

FIG. 3 is an explanatory diagram specifically showing this relationship.

In this figure, for example, as mentioned above, the values A and B are 16 bits long, the digital-to-analog converter is 24 or 8 bits long,
The explanation is based on the case where the data outputted to the digital-to-analog converter 24 is the lower 8 bits of the upper 16 bits of the multiplication result, and the values A, B are
or respectively] A in hexadecimal number (hereinafter referred to as H) = 1.
234 (H) and B-0100 (H), it becomes C-123400 (H), and the microcomputer 20 is an 8-bit digital-to-analog converter 24.
The lower 8 bits of the upper 16 bits are used for
A value (H) is output, and this value is converted into an analog quantity by the digital-to-analog converter 24 and output. Also, in Figure 3, the value of digital gain B is set to B-1000 (
H), it becomes C-1234000 (H), and the value 23 (H) is supplied to the digital-to-analog converter 24, and this value is converted into an analog quantity and output. That is, by adjusting the coefficient value which is the digital gain, it is possible to efficiently output only a desired part of the multiplication result with a long number of bits from the economical digital-to-analog converter 24 with a relatively short number of bits. It can be done.

Additionally, a digital-to-analog converter 24 as described above may be used.
If two sets of are provided, two types of control variables can be output simultaneously and comparison between both control variables can be easily performed, increasing versatility.

〔Effect of the invention〕

As explained above, according to the present invention, a digital-to-analog converter with a predetermined number of bits is connected to the data bus of a computer, and the designation information of the desired control amount and the predetermined coefficient value are inputted manually. A digital control amount corresponding to the command information is read from the RAM, the read digital control amount is multiplied by the coefficient value, and digital bit information corresponding to a predetermined number of bits of this multiplication result is converted into the digital-to-analog conversion. Since the control amount is supplied to the device and outputted as an analog quantity, a desired controlled quantity can be outputted as an analog quantity relatively easily and economically. Further, by changing the coefficient value, arbitrary bit information of the control amount can be output as an analog amount.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an elevator control device to which an elevator control amount output device according to an embodiment of the present invention is applied, and FIG. 2 is a flow chart showing the operation of the elevator control amount output device of the embodiment. 3 is an explanatory diagram showing more specifically the operation of the control amount output device for the elevator shown in FIG. 2, and FIG. 4 is a block diagram showing the configuration of the conventional elevator control device. 20. ・Microcomputer, 21. ・CPU. 23. ・RAM. 24. ・Digital-to-analog converter, 27. ・
data bus.

Claims (1)

[Claims] An elevator control amount output device that outputs a control amount of an elevator that is digitally controlled while storing each control amount in a RAM using a computer, the device having a predetermined number of bits of digital-analog connected to a data bus of the computer. a converter, input means for inputting information specifying a desired control amount to be output and a predetermined coefficient value, and reading means for reading out from the RAM a digital control amount corresponding to the information specifying the control amount input from the input means. and a multiplication means for multiplying the digital control amount read by the readout means by the predetermined coefficient value; 1. A controlled variable output device for an elevator, comprising: control means for controlling the signal to be supplied to the digital-to-analog converter so as to be outputted as an output signal.