JPS58189925U

JPS58189925U - Signal generator for electromagnetic flowmeter converter

Info

Publication number: JPS58189925U
Application number: JP8603982U
Authority: JP
Inventors: 島丸　尚
Original assignee: 横河電機株式会社
Priority date: 1982-06-11
Filing date: 1982-06-11
Publication date: 1983-12-16

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来の信号発生器の使用例を示す説明図、第２
〜４図は本考案に係り、第２図は一実施例を示すブロッ
ク構成図、第３図は信号発生器内の各種の信号の流れを
示すフローチャート、第４図は操作手順を示すフローチ
ャートである。図面中、Ｂ１はマイクロコンピュータを用いた　。電磁流量計変換器、Ｂ２は信号発生器、Ａ１は励磁電流
検出部、Ａ２は模擬流量信号の出力部、Ａ４は変換器電
流出力検出部、Ａ５はパルス積算カウンタ、八６はデー
タ入力部、Ａ８はＡ／Ｄ及びＤ／Ａ変換器、Ａ、は変換
器と共用したＣＰＵ部、Ａｌｏはメモリ、Ａ、１はデジ
タル表示部、３は励磁電流、４は模擬流量信号、５は電
流出力、７はパルス出力、９ａ。９ｂ及び９Ｃは夫々発信器の口径、流量スパン及びメー
タファクタの各設定データ、１０は出力％の設定データ
、１１はゼロ点バイアス調整の指令、１２は流速スパン
のデータ、１３は信号変換用等価抵抗値のデータ、１４
はスパン当りの信号起電力のデジタル信号、１５は設定
した出力％に相当する信号起電力のデジタル信号である
。Figure 1 is an explanatory diagram showing an example of the use of a conventional signal generator;
4 are related to the present invention, FIG. 2 is a block diagram showing one embodiment, FIG. 3 is a flowchart showing the flow of various signals in the signal generator, and FIG. 4 is a flowchart showing the operating procedure. be. In the drawing, B1 used a microcomputer. Electromagnetic flowmeter converter, B2 is a signal generator, A1 is an excitation current detection section, A2 is an output section for a simulated flow rate signal, A4 is a converter current output detection section, A5 is a pulse integration counter, 86 is a data input section, A8 is the A/D and D/A converter, A is the CPU section shared with the converter, Alo is the memory, A, 1 is the digital display section, 3 is the exciting current, 4 is the simulated flow rate signal, 5 is the current output , 7 is a pulse output, 9a. 9b and 9C are respective setting data for transmitter aperture, flow rate span, and meter factor, 10 is output % setting data, 11 is command for zero point bias adjustment, 12 is data for flow velocity span, and 13 is equivalent for signal conversion. Resistance value data, 14
is a digital signal of the signal electromotive force per span, and 15 is a digital signal of the signal electromotive force corresponding to the set output %.

Claims

[Scope of utility model registration request]

(1) An A/D converter that inputs the excitation current output from the electromagnetic flowmeter converter and converts this excitation current signal into a digital signal, and a constant specific to each electromagnetic flowmeter transmitter, that is, a meter factor, as a digital signal. A meter factor setting section for setting the simulated flow rate, a flow rate setting section for setting values related to the simulated flow rate using digital signals, and inputting each digital signal output from the A/D converter, meter factor setting section, and flow rate setting section. A microcomputer that calculates a value proportional to the excitation current value, a meter factor, and a value related to the simulated flow rate; and a microcomputer that converts the calculated value of the proportional calculation of this microcomputer into an analog signal to generate a simulated flow rate signal. A signal generator consisting of an A converter.

(2) The electromagnetic flowmeter converter is configured using a microcomputer, and the above proportional calculation is performed by this microcomputer, and the electromagnetic flowmeter converter is connected to the A/D converter and meter factor settings. 2. The signal generator according to claim 1, further comprising a flow rate setting section, a flow rate setting section, and a D/A converter.

(3) The above proportional calculation is performed by storing the converter output obtained when the electromagnetic flowmeter converter has zero input, and using a value proportional to this stored value and a value with the opposite sign as a constant term. 2. A signal generator according to claim 1 or 2, characterized in that: