CN113110280A - PLC analog quantity acquisition module for remote anti-electromagnetic interference transmission of analog quantity signal - Google Patents
PLC analog quantity acquisition module for remote anti-electromagnetic interference transmission of analog quantity signal Download PDFInfo
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Abstract
The utility model provides a PLC analog quantity collection module for remote anti-electromagnetic interference transmission of analog quantity signal, includes twin passageway module, first signal preprocessing module, a AD conversion module, a twin passageway signal processing module, communication module, a control module, a dial-up module, a power module. The PLC analog quantity acquisition module is matched with an analog quantity twinborn signal converter for remote anti-electromagnetic interference transmission of analog quantity signals, acquires complementary twinborn signals, eliminates external electromagnetic interference by using a difference method, accurately acquires and restores the analog quantity signals needing transmission, realizes remote and accurate transmission of the analog quantity signals, and is not influenced by electromagnetic interference of the surrounding environment.
Description
Technical Field
The invention relates to a PLC analog quantity acquisition module, in particular to a PLC analog quantity acquisition module for remote anti-electromagnetic interference transmission of analog quantity signals.
Background
The remote transmission of analog signals generally adopts two modes of communication and hard wiring. Under the communication mode, if network congestion occurs in a communication line, packet loss is easy to occur, the transmission quality of analog quantity signals is seriously influenced, the requirements of real-time performance, accuracy and reliability cannot be met, and common communication quantity analog quantity signals are not applied to field device control. Under the ordinary hard-wired mode, the remote transmission of analog quantity signals is easily influenced by electromagnetic interference of the surrounding environment, and particularly when strong electromagnetic field interference sources such as motors exist around, the remote transmission of analog quantity signals is easily distorted and generates a jump phenomenon.
In the prior art, chinese patent "analog acquisition module for PLC extension" (ZL: 20101052854.4) describes an analog acquisition module for PLC extension, which can simultaneously acquire multiple ac or dc analog quantities. However, the influence of electromagnetic interference of the surrounding environment on the long-distance transmission of the analog quantity signal cannot be eliminated, so that the acquired analog quantity signal is easy to distort and jump.
Disclosure of Invention
The invention aims to solve the problems that in the application occasions of field device control, state monitoring and the like, remote transmission of analog quantity signals is easily influenced by electromagnetic interference of the surrounding environment in a common hard wiring mode, and particularly, when strong electromagnetic field interference sources such as motors exist around, the remote transmission analog quantity signals are easily distorted and generate a jump phenomenon. The PLC analog quantity acquisition module with the twin channel is used for remote anti-electromagnetic interference transmission of analog quantity signals, acquires complementary twin analog quantity signals, eliminates external electromagnetic interference by using a difference method, accurately acquires and restores the analog quantity signals to be transmitted, and realizes accurate remote transmission of the analog quantity signals.
The technical scheme adopted by the invention is as follows:
a PLC analog quantity acquisition module for remote anti-electromagnetic interference transmission of analog quantity signals comprises:
the device comprises a twin channel module, a first signal preprocessing module, a first AD conversion module, a first twin channel signal processing module, a communication module, a first control module and a first dial module;
the twin channel module comprises n pairs of twin channels, each pair of twin channels comprises 2 twin signal acquisition input channels, the twin channel module acquires n pairs of complementary twin signals (X1, Y1, X2, Y2, X3, Y3 … … Xn, Yn), and outputs the n pairs of twin signals (X1, Y1, X2, Y2, X3, Y3 … … Xn, Yn) to the first signal preprocessing module;
the first signal preprocessing module is used for acquiring n pairs of twin signals (X1, Y1, X2, Y2, X3, Y3 … … Xn and Yn) output by the twin channel module, performing preprocessing isolation amplification filtering processing, and then outputting n pairs of twin signals (AX1, AY1, AX2, AY2, AX3, AY3 … … AXn and AYn) to the first AD conversion module;
the first AD conversion module is used for acquiring n pairs of twin signals (AX1, AY1, AX2, AY2, AX3, AY3 … … AXn and AYn) output by the first signal preprocessing module, performing analog-to-digital conversion processing according to channel specification signals S1, S2 and S3 … … Sn output by the first code dialing module, and then outputting n pairs of twin signals (DX1, DY1, DX2, DY2, DX3, DY3 … … DXn and DYn) to the first signal processing module;
the first twin channel signal processing module acquires n pairs of twin signals (DX1, DY1, DX2, DY2, DX3, DY3 … … DXn and DYn) output by the first AD conversion module, performs twin channel signal processing according to channel specification signals S1, S2 and S3 … … Sn output by the first code dialing module, and then outputs n signals (XY1, XY2 and XY3 … … XYn) to the communication module;
the communication module is used for acquiring n channel signals (XY1, XY2, XY3 … … XYn) output by the first twin channel signal processing module and then outputting the n channel signals to the PLC;
the first control module outputs control signals to the twin channel module, the first signal preprocessing module, the first AD conversion module, the first twin channel signal processing module and the communication module, and controls the whole data acquisition and processing process;
the first dialing module outputs channel specification signals S1, S2 and S3 … … Sn to the first AD conversion module and the first twin channel signal processing module according to a dialing rule output method, wherein Sn is the channel specification signal of the twin channel n of the twin channel module.
The PLC analog acquisition module further comprises a first power supply module, the first power supply module is a twin channel module, a first signal preprocessing module, a first AD conversion module, a first twin channel signal processing module, a first communication module, a first control module and a first dial-up module provide power.
The analog-to-digital conversion processing method of the first AD conversion module comprises the following steps:
step 1: acquiring n pairs of twin signals AX1, AY1, AX2, AY2, AX3, AY3 … … AXn and AYn output by the first signal preprocessing module and channel specification signals S1, S2 and S3 … … Sn output by the first code dialing module.
Step 2: if S1 is equal to 1, AX1 and AY1 are linearly interpolated according to 6553 corresponding to 4mA and 32767 corresponding to 20mA and converted into DX1 and AY 1;
if S1 is equal to 2, AX1 and AY1 are converted into DX1 and DY1 by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if S1 is equal to 3, AX1 and AY1 are linearly interpolated according to 0V for 0 and 5V for 32767 to DX1 and DY 1.
And step 3: if S2 is equal to 1, AX2 and AY2 are linearly interpolated according to 6553 corresponding to 4mA and 32767 corresponding to 20mA to be converted into DX2 and DY 2;
if S2 is equal to 2, AX2 and AY2 are converted into DX2 and DY2 by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if S2 is equal to 3, AX2 and AY2 are linearly interpolated according to 0V for 0 and 5V for 32767 to DX2 and DY 2.
And 4, step 4: if S3 is equal to 1, AX3 and AY3 are linearly interpolated according to 6553 corresponding to 4mA and 32767 corresponding to 20mA to be converted into DX3 and DY 3;
if S3 is equal to 2, AX3 and AY3 are converted into DX3 and DY3 by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if S3 is equal to 3, AX3 and AY3 are linearly interpolated according to 0V for 0 and 5V for 32767 to DX3 and DY 3.
……
And 5: if Sn is equal to 1, AXn and AYn are linearly interpolated according to 6553 corresponding to 4mA and 32767 corresponding to 20mA and converted into DXn and DYn;
if Sn is 2, AXn and AYn are converted into DXn and DYn by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if Sn is 3, AXn and AYn are converted to DXn, DYn by linear interpolation according to 0V for 0 and 5V for 32767.
Step 6: outputting n pairs of twin signals (DX1, DY1, DX2, DY2, DX3, DY3 … … DXn, DYn) and returning to the step 1.
The twin channel signal processing method of the first twin channel signal processing module comprises the following steps:
the method comprises the following steps: the method comprises the steps of collecting n pairs of twin signals DX1, DY1, DX2, DY2, DX3, DY3 … … DXn and DYn output by a first AD conversion module and channel specification signals S1, S2 and S3 … … Sn output by a first dialing module.
Step two: if S1 is equal to 1, the channel signal acquisition value zero point C1Zero6553 channel signal acquisition value full point C1Is full of＝32767；
Otherwise, the channel signal acquisition value zero point C1ZeroChannel signal acquisition value full point C1Is full of＝32767。
If S2 is equal to 1, the channel signal acquisition value zero point C2 Zero6553 channel signal acquisition value full point C2 Is full of32767; otherwise, the channel signal acquisition value zero point C2ZeroChannel signal acquisition value full point C2Is full of＝32767。
If S3 is equal to 1, the channel signal acquisition value zero point C3 Zero6553 channel signal acquisition value full point C3 Is full of32767; otherwise, the channel signal acquisition value zero point C3ZeroChannel signal acquisition value full point C3Is full of＝32767。
……
If Sn is equal to 1, the zero point Cn of the channel signal acquisition value Zero6553, channel signal acquisition value full point Cn Is full of32767; otherwise, the channel signal acquisition value zero point CnZeroWhen the channel signal acquisition value is equal to 0, the full point Cn of the channel signal acquisition valueIs full of＝32767。
Step three: XY1 ═ by (DX1+ C1Zero+C1Is full of-DY1)/2；
XY2＝(DX2+C2Zero+C2Is full of-DY2)/2；
XY3＝(DX3+C3Zero+C3Is full of-DY3)/2；
……
XYn＝(DXn+CnZero+CnIs full of-DYn)/2。
Step IV: and outputting n signals XY1, XY2 and XY3 … … XYn, and returning to the step (r).
The number of the dialing codes of the first dialing module is consistent with the number of the twin channels contained in the twin channel module, the number of the dialing codes is n, the numbers are respectively ' 1 ', ' 2 ', ' 3 ', ' … … ' n ', and the dialing codes of the ' n ' number are correspondingly provided with the specifications of analog quantity signals collected by the twin channel n of the twin channel module 1. Each dial has 3 positions, a '1' bit, a '2' bit and a '3' bit;
if the analog quantity signal specification collected by the twin channel n of the twin channel module is 4-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n to be 1;
if the analog quantity signal specification collected by the twin channel n of the twin channel module is 0-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n to be 2;
and if the analog quantity signal specification acquired by the twin channel of the twin channel module is 0-5V analog quantity signal, setting the dial corresponding to the twin channel to be 3 by the user.
The dial rule output method of the first dial module comprises the following steps:
step a, collecting dial position information.
Step b, if the dial of the '1' is a '1' bit, S1 is equal to 1; if the "1" dial is "2", S1 is 2; if the "1" dial is "3", S1 is 3.
If the 2-digit is 1, S2 is 1; if the 2-digit dial is 2, S2 is 2; if the "2" dial is "3", S2 is 3.
If the "3" dial is a "1" bit, S3 is 1; if the 3-digit is 2, S3 is 2; if the "3" dial is "3", S3 is 3.
……
If the dial of 'n' is '1', Sn is 1; if the dial of 'n' is '2', Sn is 2; if the "n" number is "3", Sn is 3.
And c, outputting channel specification signals S1, S2 and S3 … … Sn, and returning to the step a.
The invention relates to a PLC analog quantity acquisition module for remote anti-electromagnetic interference transmission of analog quantity signals, which has the following technical effects:
1) the PLC analog acquisition module for remote anti-electromagnetic interference transmission of the analog quantity signal is matched with an analog quantity twin signal converter for remote anti-electromagnetic interference transmission of the analog quantity signal to carry out remote transmission of the analog quantity signal, so that the influence of the electromagnetic interference signal in the transmission process of the analog quantity signal can be obviously eliminated, the distortion and jumping of the transmitted analog quantity signal are avoided, and the remote accurate transmission of the analog quantity signal is ensured.
2) The invention relates to a PLC analog quantity acquisition module, in particular to a PLC analog quantity acquisition module with a twin channel for remote anti-electromagnetic interference transmission of an analog quantity signal, which is matched with an analog quantity twin signal converter for remote anti-electromagnetic interference transmission of the analog quantity signal to acquire complementary twin signals, eliminates external electromagnetic interference by using a difference method, accurately acquires and restores the analog quantity signal to be transmitted, realizes remote accurate transmission of the analog quantity signal and is not influenced by electromagnetic interference of the surrounding environment.
3) The invention relates to a PLC analog acquisition module with a twin channel for remote anti-electromagnetic interference transmission of analog signals, which is suitable for acquiring continuously-changed analog voltage and current signals with specifications of 4-20 mA, 0-20 mA current signals, 0-5V voltage signals and the like.
Drawings
FIG. 1 is a schematic structural diagram of a PLC analog acquisition module with a twin channel for remote anti-electromagnetic interference transmission of analog signals according to the present invention.
Fig. 2 is a flowchart of an analog-to-digital conversion processing method of the first AD conversion module 3.
Fig. 3 is a flowchart of a twin channel signal processing method of the first twin channel signal processing module 4.
Fig. 4 is a diagram of a dial man-machine interaction panel style of the first dial module 8.
Fig. 5 is a flowchart of a dial rule output method of the first dial module 8.
FIG. 6 is a schematic view of example 1 of the present invention;
wherein: 11-a liquid level sensor, B-an analog quantity twinning signal converter for remote anti-electromagnetic interference transmission of analog quantity signals, 12-an oil tank, 9-a signal transmission cable, a PLC acquisition module with a twinning channel for remote anti-electromagnetic interference transmission of analog quantity signals of an A-speed regulator control cabinet PLC controller, a certain oil level of the oil tank in the measuring range of the C plane-the liquid level transmitter, f 1-a hydraulic system pressure oil tank liquid level signal, f 2-a complementary twinning rotating speed signal of the hydraulic system pressure oil tank liquid level signal f1, and electromagnetic interference signals released by strong electromagnetic field interference sources such as an M-motor, a delta-motor and the like.
FIG. 7 is a schematic diagram of an analog twin signal converter for long-distance anti-electromagnetic interference transmission of an analog signal according to the present invention.
Detailed Description
As shown in fig. 1, a PLC analog acquisition module for remote anti-electromagnetic interference transmission of an analog signal includes a twin channel module 1, a first signal pre-processing module 2, a first AD conversion module 3, a first twin channel signal processing module 4, a communication module 5, a first control module 6, a first power module 7, and a first dial module 8.
The twin channel module 1 comprises n pairs of twin channels, each pair of twin channels comprises 2 twin signal acquisition input channels, the twin signal acquisition input channels are used for acquiring n pairs of complementary twin signals (X1, Y1, X2, Y2, X3, Y3 … … Xn, Yn) input into the PLC analog quantity acquisition module from the outside, and outputting n pairs of twin signals (X1, Y1, X2, Y2, X3, Y3 … … Xn, Yn) to the first signal preprocessing module 2. The n pairs of complementary twin signals are analog quantity signals output by an analog quantity signal which is output by an external sensor for measuring a certain physical quantity and is output by an analog quantity twin signal converter B for remote anti-electromagnetic interference transmission of the analog quantity signal. For 4-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 24 mA; for 0-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 20 mA; for 0-5V analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 5V.
The first signal preprocessing module 2 collects n pairs of twin signals (X1, Y1, X2, Y2, X3, Y3 … … Xn, Yn) output by the twin channel module 1, performs pre-isolation amplification filtering processing, and then outputs n pairs of twin signals (AX1, AY1, AX2, AY2, AX3, AY3 … … AXn, AYn) to the first AD conversion module 3.
The first AD conversion module 3 collects n pairs of twin signals (AX1, AY1, AX2, AY2, AX3, AY3 … … AXn, AYn) output by the first signal preprocessing module 2, performs analog-to-digital conversion processing according to the channel specification signals S1, S2, S3 … … Sn output by the first code dialing module 8, and then outputs n pairs of twin signals (DX1, DY1, DX2, DY2, DX3, DY3 … … DXn, DYn) to the first twin channel signal processing module 4.
The analog-to-digital conversion processing method of the first AD conversion module 3 includes the following steps:
1. the n pairs of twin signals AX1, AY1, AX2, AY2, AX3, AY3 … … AXn and AYn output by the first signal preprocessing module 2 and the channel specification signals S1, S2 and S3 … … Sn output by the first dial module 8 are collected.
2. If S1 is equal to 1, AX1 and AY1 are linearly interpolated according to 6553 corresponding to 4mA and 32767 corresponding to 20mA and converted into DX1 and AY 1;
if S1 is equal to 2, AX1 and AY1 are converted into DX1 and DY1 by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if S1 is equal to 3, AX1 and AY1 are linearly interpolated according to 0V for 0 and 5V for 32767 to DX1 and DY 1.
3. If S2 is equal to 1, AX2 and AY2 are linearly interpolated according to 6553 corresponding to 4mA and 32767 corresponding to 20mA to be converted into DX2 and DY 2;
if S2 is equal to 2, AX2 and AY2 are converted into DX2 and DY2 by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if S2 is equal to 3, AX2 and AY2 are linearly interpolated according to 0V for 0 and 5V for 32767 to DX2 and DY 2.
4. If S3 is equal to 1, AX3 and AY3 are linearly interpolated according to 6553 corresponding to 4mA and 32767 corresponding to 20mA to be converted into DX3 and DY 3;
if S3 is equal to 2, AX3 and AY3 are converted into DX3 and DY3 by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if S3 is equal to 3, AX3 and AY3 are linearly interpolated according to 0V for 0 and 5V for 32767 to DX3 and DY 3.
……
5. If Sn is equal to 1, AXn and AYn are linearly interpolated according to 6553 corresponding to 4mA and 32767 corresponding to 20mA and converted into DXn and DYn;
if Sn is 2, AXn and AYn are converted into DXn and DYn by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if Sn is 3, AXn and AYn are converted to DXn, DYn by linear interpolation according to 0V for 0 and 5V for 32767.
6. Outputting n pairs of twin signals (DX1, DY1, DX2, DY2, DX3, DY3 … … DXn, DYn) and returning to the step 1.
A flowchart of the analog-to-digital conversion processing method of the first AD conversion module 3 is shown in fig. 2.
AXn and AYn are converted into DXn and DYn by linear interpolation according to 6553 corresponding to 4mA and 32767 corresponding to 20mA, namely
DXn＝6553+(32767-6553)(AXn-4mA)/(20mA-4mA)；
DYn＝6553+(32767-6553)(AYn-4mA)/(20mA-4mA)；
The linear interpolation conversion method is a conventional method, and is referred to as an encyclopedia linear interpolation entry.
The first twin channel signal processing module 4 collects n pairs of twin signals (DX1, DY1, DX2, DY2, DX3, DY3 … … DXn, DYn) output by the first AD conversion module 3, performs twin channel signal processing according to the channel specification signals S1, S2, S3 … … Sn output by the first dialing module 8, and then outputs n signals (XY1, XY2, XY3 … … XYn) to the communication module 5.
The twin channel signal processing method of the first twin channel signal processing module 4 comprises the following steps:
1. the n pairs of twin signals DX1, DY1, DX2, DY2, DX3, DY3 … … DXn, DYn output by the first AD conversion module 3 and the channel specification signals S1, S2, S3 … … Sn output by the first dialing module 8 are collected.
2. If S1 is equal to 1, the channel signal acquisition value zero point C1 Zero6553 channel signal acquisition value full point C1 Is full of32767; otherwise, the channel signal acquisition value zero point C1ZeroChannel signal acquisition value full point C1Is full of＝32767。
If S2 is equal to 1, the channel signal acquisition value zero point C2 Zero6553 channel signal acquisition value full point C2 Is full of32767; otherwise, the channel signal acquisition value zero point C2ZeroChannel signal acquisition value full point C2Is full of＝32767。
If S3 is equal to 1, the channel signal acquisition value zero point C3 Zero6553 channel signal acquisition value full point C3 Is full of32767; otherwise, the channel signal acquisition value zero point C3ZeroChannel signal acquisition value full point C3Is full of＝32767。
……
If Sn is equal to 1, the zero point Cn of the channel signal acquisition value Zero6553, channel signal acquisition value full point Cn Is full of32767; otherwise, the channel signal acquisition value zero point CnZeroWhen the channel signal acquisition value is equal to 0, the full point Cn of the channel signal acquisition valueIs full of＝32767。
3、XY1＝(DX1+C1Zero+C1Is full of-DY1)/2；
XY2＝(DX2+C2Zero+C2Is full of-DY2)/2；
XY3＝(DX3+C3Zero+C3Is full of-DY3)/2；
……
XYn＝(DXn+CnZero+CnIs full of-DYn)/2。
4. And outputting n signals XY1, XY2 and XY3 … … XYn, and returning to the step 1.
A flow chart of the twin channel signal processing method of the first twin channel signal processing module 4 is shown in fig. 3.
The communication module 5 collects n channel signals (XY1, XY2, XY3 … … XYn) output by the first twin channel signal processing module 4, and then outputs the n channel signals to the PLC in a communication mode. The n channel signals, namely n pairs of complementary twin signals input into the PLC analog acquisition module from the outside, are processed in series by the twin channel module 1, the first signal preprocessing module 2, the first AD conversion module 3 and the first twin channel signal processing module 4 to finally obtain n channel signals (XY1, XY2, XY3 … … XYn).
The first control module 6 outputs control signals to the twin channel module 1, the first signal preprocessing module 2, the first AD conversion module 3, the first twin channel signal processing module 4 and the communication module 5, and controls the whole data acquisition and processing process. The whole data acquisition and processing process comprises the whole data flow acquisition and processing process that n pairs of complementary twin signals (x1, y1, x2, y2, x3, y3 … … xn, yn) input into the PLC analog acquisition module from the outside are processed in series by the twin channel module 1, the first signal preprocessing module 2, the first AD conversion module 3 and the first twin channel signal processing module 4 and finally output to the PLC controller through the communication module 5 in a communication mode, wherein the n pairs of complementary twin signals are n channel signals (XY1, XY2, XY3 … … XYn).
The first power supply module 7 supplies power to the twin channel module 1, the first signal preprocessing module 2, the first AD conversion module 3, the first twin channel signal processing module 4, the communication module 5, the first control module 6 and the first dial-up module 8.
A user sets dial codes according to the specification of the remote transmission analog quantity signal and according to the requirement, the first dial module 8 outputs channel specification signals S1, S2 and S3 … … Sn to the first AD conversion module 3 and the first twin channel signal processing module 4 according to the setting of the dial codes by the user and a dial code rule output method. Sn is a channel specification signal of the twin channel n of the twin channel module 1.
The pattern diagram of the dial man-machine interaction panel of the first dial module 8 is shown in fig. 4, and includes n dial frames of numbers "1", "2", "3" … … "n", each dial frame includes a dial block, and each dial block includes 3 dial bits of "1", "2" and "3" in the dial frame.
The dialing number of the first dialing module 8 is consistent with the twin channel number contained in the twin channel module 1, the number of the first dialing module is n, the numbers are respectively ' 1 ', ' 2 ', ' 3 ', ' … … ' n ', and the dialing number of the ' n ' is correspondingly provided with the analog quantity signal specification collected by the twin channel n of the twin channel module 1. Each dial has 3 positions, "1" bit, "2" bit, and "3" bit.
If the analog quantity signal specification collected by the twin channel module 1 twin channel n is 4-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n to be 1; if the analog quantity signal specification collected by the twin channel module 1 twin channel n is 0-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n to be 2; and if the analog quantity signal specification collected by the twin channel of the twin channel module 1 is 0-5V analog quantity signal, setting the dial corresponding to the twin channel to be 3 by the user.
The dialing rule output method of the first dialing module 8 comprises the following steps:
1. and collecting dial position information.
2. If the "1" dial is "1", S1 is 1; if the "1" dial is "2", S1 is 2; if the "1" dial is "3", S1 is 3.
If the 2-digit is 1, S2 is 1; if the 2-digit dial is 2, S2 is 2; if the "2" dial is "3", S2 is 3.
If the "3" dial is a "1" bit, S3 is 1; if the 3-digit is 2, S3 is 2; if the "3" dial is "3", S3 is 3.
……
If the dial of 'n' is '1', Sn is 1; if the dial of 'n' is '2', Sn is 2; if the "n" number is "3", Sn is 3.
3. Channel specification signals S1, S2, S3 … … Sn are output, and the process returns to step 1.
A flowchart of the dialing rule output method of the first dialing module 8 is shown in fig. 5.
A schematic diagram of an analog twin signal converter B for remote anti-electromagnetic interference transmission of analog signals is shown in FIG. 7.
The converter includes: an input channel module 10 ', a second signal preprocessing module 9 ', a second dialing module 8 ', a second control module 6 ', a second AD conversion module 5 ', a second twin channel signal processing module 4 ', a second DA conversion module 3 ', a second signal output processing module 2 ', and a twin channel output module 1 '.
The input channel module 10 'comprises n input channels and is used for acquiring input n channel signals XY 1', XY2 ', XY 3' … … XYn 'and outputting n channel signals XY 1', XY2 ', XY 3' … … XYn 'to the second signal preprocessing module 9';
the second signal preprocessing module 9 ' acquires n channel signals XY1 ', XY2 ', XY3 ' … … XYn ' output by the input channel module 10 ', performs pre-isolation amplification filtering processing, and then outputs n channel signals AXY1 ', AXY2 ', AXY3 ' … … AXYn ' to the second AD conversion module 5 ';
the second AD conversion module 5 ' collects the n channel signals AXY1 ', AXY2 ', AXY3 ', … … AXYn ' output by the second signal preprocessing module 9 ', and outputs the n channel signals DXY1 ', DXY2 ', DXY3 ', … … DXY ' to the second twin channel signal processing module 4 ';
the second twin channel signal processing module 4 'acquires n channel signals DXY 1', DXY2 ', DXY 3' … … DXYn 'output by the second AD conversion module 5', performs twin channel signal processing according to the channel specification signals S1 ', S2', S3 '… … Sn' output by the second dialing module 8 ', and outputs n pairs of complementary twin signals DX 1', DY1 ', DX 2', DY2 ', DX 3', DY3 '… … DXn', DYn 'to the second DA conversion module 3';
the second DA conversion module 3 'collects n pairs of twin signals DX 1', DY1 ', DX 2', DY2 ', DX 3', DY3 '… … DXn', DYn 'output by the second twin channel signal processing module 4', performs digital-to-analog conversion processing according to the channel specification signals S1 ', S2', S3 '… … Sn' output by the second dialing module 8 ', and then outputs n pairs of twin signals AX 1', AY1 ', AX 2', AY2 ', AX 3', AY3 '… … AXn', AYn 'to the second signal output processing module 2';
the second signal output processing module 2 ' collects n pairs of twin signals AX1 ', AY1 ', AX2 ', AY2 ', AX3 ', AY3 ' … … AXn ', AYn ' output by the second DA conversion module 3 ', performs isolation amplification processing, and then outputs n pairs of twin signals X1 ', Y1 ', X2 ', Y2 ', X3 ', Y3 ' … … Xn ', Yn ' to the second twin channel output module 4 ';
the second twin channel output module 4 ' collects n pairs of complementary twin signals X1 ', Y1 ', X2 ', Y2 ', X3 ', Y3 ' … … Xn ', Yn ' output by the second signal output processing module 2 ', and outputs n pairs of complementary twin analog quantity signals X1 ', Y1 ', X2 ', Y2 ', X3 ', Y3 ' … … Xn ', Yn ' through the twin channel output module 1 ';
the second control module 6 ' outputs control signals to the second twin channel output module 4 ', the second signal output processing module 2 ', the second DA conversion module 3 ', the second twin channel signal processing module 4 ' to control the data output processing process.
The converter comprises a second power supply module 7 ', a second power supply module 7 ' is a second twin channel output module 4 ', a second signal output processing module 2 ', a second DA conversion module 3 ', a second twin channel signal processing module 4 ', a second AD conversion module 5 ', a second control module 6 ', a second dialing module 8 ', a second signal preprocessing module 9 ', and an input channel module 10 ' for supplying power.
The second twin channel output module 4' comprises n pairs of twin channels, each pair comprising 2 twin signal output channels.
The n pairs of complementary twin signals are remotely transmitted through a cable, and are reduced into analog quantity signals needing to be transmitted after conversion processing;
for 4-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 24 mA;
for 0-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 20 mA;
for 0-5V analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 5V.
The number of the second dialing module 8 ' is consistent with the number of the twin channels included in the second twin channel output module 4 ', the number of the second dialing module is n, the numbers of the second dialing module are respectively ' 1 ', ' 2 ', ' 3 ', ' … … ' n ', and the dialing code of the ' n ' is correspondingly provided with the specification of the analog quantity signal collected by the twin channel n ' of the second twin channel output module 4 '. Each dial has 3 positions, a "1 '" bit, a "2 '" bit, and a "3 '" bit;
if the analog quantity signal specification output by the second twin channel output module 4 ' twin channel n ' is 4-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n ' to be ' 1 '; if the analog quantity signal specification output by the twin channel output module 4 ' twin channel n ' is 0-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n ' to be ' 2 '; if the analog quantity signal specification output by the second twin channel output module 4 'twin channel n' is 0-5V analog quantity signal, the user sets the dial corresponding to the twin channel n 'to be 3' ″.
The invention will be further elucidated with reference to the figures and exemplary embodiments.
Example 1:
as shown in fig. 6, a governor hydraulic system pressure oil tank liquid level sensor 11 measures the liquid level C of a hydraulic system oil tank 12, the output 4-20 mA analog quantity signal f1 is converted by an analog quantity twin signal converter B for remote anti-electromagnetic interference transmission of analog quantity signals, and then 1 pair of complementary twin signals f1, f2 are output, the pair of complementary twin signals are remotely transmitted by a signal transmission cable 9, and input into a PLC controller of a governor control cabinet, a PLC analog quantity acquisition module a with a twin channel for remote anti-electromagnetic interference transmission of analog quantity signals.
The speed regulator hydraulic system pressure oil tank liquid level sensor 11 measures the liquid level C of the hydraulic system pressure oil tank 12, outputs a hydraulic system pressure oil tank liquid level signal f1, the hydraulic system pressure oil tank liquid level signal f1 inputs an analog quantity twin signal converter B for remote anti-electromagnetic interference transmission of analog quantity signals, and after conversion, complementary twin signals f1 and f2 of 4-20 mA specification of the speed regulator hydraulic system pressure oil tank liquid level are transmitted through a signal transmission cable 4 by 1.
The signal xy1 ═ f1 input in the analog quantity twin signal converter B;
in the analog twin signal converter B:
AXY1＝XY1＝xy1＝f1；
in the analog twin signal converter B:
DXY1＝32767*AXY1/20mA；
in the analog twin signal converter B:
DX1＝DXY1；
DY1＝C1zero+C1Is full of-DXY1；
In the analog twin signal converter B:
x1＝X1＝AX1＝20mA*DX1/32767＝20mA*DXY1/32767＝f1；
y1＝Y1＝AY1＝20mA*DY1/32767＝20mA*(C1zero+C1Is full of-DXY1)/32767＝f2；
Then f1+ f2 equals 24 mA.
The complementary twin signals f1 and f2 are transmitted to an analog input module of a PLC controller of the speed regulator control cabinet by adopting different cores of the same cable, so that the same external electromagnetic environment of the two signals is ensured, and the electromagnetic interference signals received by the signal transmission are consistent and are delta. The PLC controller of the speed regulator control cabinet acquires the input twin signals of the hydraulic oil tank liquid level through the twin channel 1 of the analog quantity acquisition module A, and the twin signals are respectively f1+ delta and f2+ delta.
And in the PLC analog quantity acquisition module A of the speed regulator control cabinet, AX1 is f1+ delta, and AX2 is f2+ delta.
And then DX1 is 32767 AX1/20mA and DX2 is 32767 AX2/20mA in the PLC analog quantity acquisition module A of the speed regulator control cabinet.
Then XY1 is (DX1+ C1) in the PLC analog quantity acquisition module A of the speed regulator control cabinetZero+C1Is full of-DY1)/2＝(32767*AX1/20mA+6553+32767-32767*AX2/20mA)/2＝f1/20mA*32767。
The speed regulator control cabinet PLC acquires the electromagnetic interference signal delta-free item in the final expression of the analog quantity signal, so that the method can obviously eliminate the influence of the electromagnetic interference signal in the transmission process of the analog quantity signal, avoid the distortion and jump of the analog quantity signal acquired by measurement and ensure the long-distance transmission of the analog quantity signal.
Although the above description describes the case where the device of the present invention is applied to the governor hydraulic system tank level sensor to measure the hydraulic system tank level, and the output level signal is converted by the analog twin signal converter and transmitted to the governor control cabinet PLC analog acquisition module a, it should be understood by those skilled in the art that various changes may be made to the above exemplary embodiment without departing from the scope of the claims, and the device is widely applied to the transmission of analog signals of other specifications.
Claims (6)
1. The utility model provides a PLC analog quantity collection module for remote anti-electromagnetic interference transmission of analog quantity signal which characterized in that includes: the device comprises a twin channel module (1), a first signal preprocessing module (2), a first AD conversion module (3), a first twin channel signal processing module (4), a communication module (5), a first control module (6) and a first dial module (8);
the twin channel module (1) comprises n pairs of twin channels, each pair of twin channels comprises 2 twin signal acquisition input channels, the twin channel module (1) acquires n pairs of complementary twin signals (X1, Y1, X2, Y2, X3, Y3 … … Xn, Yn), and outputs the n pairs of twin signals (X1, Y1, X2, Y2, X3, Y3 … … Xn, Yn) to the first signal pre-processing module (2);
the first signal preprocessing module (2) is used for acquiring n pairs of twin signals (X1, Y1, X2, Y2, X3, Y3 … … Xn and Yn) output by the twin channel module (1), performing preprocessing isolation, amplification and filtering, and outputting n pairs of twin signals (AX1, AY1, AX2, AY2, AX3, AY3 … … AXn and AYn) to the first AD conversion module (3);
the first AD conversion module (3) collects n pairs of twin signals (AX1, AY1, AX2, AY2, AX3, AY3 … … AXn and AYn) output by the first signal preprocessing module (2), carries out analog-to-digital conversion processing according to channel specification signals S1, S2 and S3 … … Sn output by the first code dialing module (8), and then outputs n pairs of twin signals (DX1, DY1, DX2, DY2, DX3, DY3 … … DXn and DYn) to the first twin channel signal processing module (4);
the first twin channel signal processing module (4) collects n pairs of twin signals (DX1, DY1, DX2, DY2, DX3, DY3 … … DXn and DYn) output by the first AD conversion module (3), carries out twin channel signal processing according to channel specification signals S1, S2 and S3 … … Sn output by the first code dialing module (8), and then outputs n signals (XY1, XY2 and XY3 … … XYn) to the communication module (5);
the communication module (5) collects n channel signals (XY1, XY2, XY3 … … XYn) output by the first twin channel signal processing module (4), and then outputs the n channel signals to the PLC;
the first control module (6) outputs control signals to the twin channel module (1), the first signal preprocessing module (2), the first AD conversion module (3), the first twin channel signal processing module (4) and the communication module (5) and controls the whole data acquisition and processing process;
the first dial module (8) outputs channel specification signals S1, S2 and S3 … … Sn to the first AD conversion module (3) and the first twin channel signal processing module (4) according to a dial rule output method, wherein Sn is the channel specification signal of the twin channel n of the twin channel module (1).
2. The PLC analog acquisition module of claim 1, wherein the PLC analog acquisition module is configured to perform long-range anti-electromagnetic interference transmission of analog signals, and further configured to: the PLC analog acquisition module further comprises a first power supply module (7), wherein the first power supply module (7) is a twin channel module (1), a first signal preprocessing module (2), a first AD conversion module (3), a first twin channel signal processing module (4), a first communication module (5), a first control module (6) and a first dial-up module (8) provide power.
3. The PLC analog acquisition module of claim 1, wherein the PLC analog acquisition module is configured to perform long-range anti-electromagnetic interference transmission of analog signals, and further configured to: the analog-to-digital conversion processing method of the first AD conversion module (3) comprises the following steps:
step 1: acquiring n pairs of twin signals AX1, AY1, AX2, AY2, AX3, AY3 … … AXn and AYn output by the first signal preprocessing module (2) and channel specification signals S1, S2 and S3 … … Sn output by the first code dialing module (8);
step 2: if S1 is equal to 1, AX1 and AY1 are linearly interpolated according to 6553 corresponding to 4mA and 32767 corresponding to 20mA and converted into DX1 and AY 1;
if S1 is equal to 2, AX1 and AY1 are converted into DX1 and DY1 by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767; if S1 is equal to 3, AX1 and AY1 are linearly interpolated according to 0V corresponding to 0 and 5V corresponding to 32767 to be converted into DX1 and DY 1;
and step 3: if S2 is equal to 1, AX2 and AY2 are linearly interpolated according to 6553 corresponding to 4mA and 32767 corresponding to 20mA to be converted into DX2 and DY 2;
if S2 is equal to 2, AX2 and AY2 are converted into DX2 and DY2 by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if S2 is equal to 3, AX2 and AY2 are linearly interpolated according to 0V corresponding to 0 and 5V corresponding to 32767 to be converted into DX2 and DY 2;
and 4, step 4: if S3 is equal to 1, AX3 and AY3 are linearly interpolated according to 6553 corresponding to 4mA and 32767 corresponding to 20mA to be converted into DX3 and DY 3;
if S3 is equal to 2, AX3 and AY3 are converted into DX3 and DY3 by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if S3 is equal to 3, AX3 and AY3 are linearly interpolated according to 0V corresponding to 0 and 5V corresponding to 32767 to be converted into DX3 and DY 3;
……
and 5: if Sn is equal to 1, AXn and AYn are linearly interpolated according to 6553 corresponding to 4mA and 32767 corresponding to 20mA and converted into DXn and DYn;
if Sn is 2, AXn and AYn are converted into DXn and DYn by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if Sn is 3, AXn and AYn are linearly interpolated according to 0V corresponding to 0,5V corresponding to 32767 and converted into DXn and DYn;
step 6: outputting n pairs of twin signals (DX1, DY1, DX2, DY2, DX3, DY3 … … DXn, DYn) and returning to the step 1.
4. The PLC analog acquisition module of claim 1, wherein the PLC analog acquisition module is configured to perform long-range anti-electromagnetic interference transmission of analog signals, and further configured to: the twin channel signal processing method of the first twin channel signal processing module (4) comprises the following steps:
the method comprises the following steps: acquiring n pairs of twin signals DX1, DY1, DX2, DY2, DX3, DY3 … … DXn and DYn output by the AD conversion module 3 and channel specification signals S1, S2 and S3 … … Sn output by the first dialing module (8);
step two: if S1 is equal to 1, the channel signal acquisition value zero point C1Zero6553 channel signal acquisition value full point C1Is full of32767; otherwise, the channel signal acquisition value zero point C1ZeroChannel signal acquisition value full point C1Is full of＝32767；
If S2 is equal to 1, the channel signal acquisition value zero point C2Zero6553 channel signal acquisition value full point C2Is full of32767; otherwise, the channel signal acquisition value zero point C2ZeroChannel signal acquisition value full point C2Is full of＝32767；
If S3 is equal to 1, the channel signal acquisition value zero point C3Zero6553 channel signal acquisition value full point C3Is full of32767; otherwise, the channel signal acquisition value zero point C3ZeroChannel signal acquisition value full point C3Is full of＝32767；
……
If Sn is equal to 1, the zero point Cn of the channel signal acquisition valueZero6553, channel signal acquisition value full point CnIs full of32767; otherwise, the channel signal acquisition value zero point CnZeroWhen the channel signal acquisition value is equal to 0, the full point Cn of the channel signal acquisition valueIs full of＝32767；
Step three: XY1 ═ by (DX1+ C1Zero+C1Is full of-DY1)/2；
XY2＝(DX2+C2Zero+C2Is full of-DY2)/2；
XY3＝(DX3+C3Zero+C3Is full of-DY3)/2；
……
XYn＝(DXn+CnZero+CnIs full of-DYn)/2；
Step IV: and outputting n signals XY1, XY2 and XY3 … … XYn, and returning to the step (r).
5. The PLC analog acquisition module of claim 1, wherein the PLC analog acquisition module is configured to perform long-range anti-electromagnetic interference transmission of analog signals, and further configured to: the dialing number of the first dialing module (8) is consistent with the number of twin channels contained in the twin channel module (1), the number of the dialing number is n, the numbers are respectively '1', '2', '3' … … 'n', and the dialing number of the 'n' is correspondingly provided with the specification of analog quantity signals collected by the twin channels n of the twin channel module 1; each dial has 3 positions, a '1' bit, a '2' bit and a '3' bit;
if the analog quantity signal specification collected by the twin channel n of the twin channel module (1) is 4-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n to be 1;
if the analog quantity signal specification collected by the twin channel n of the twin channel module (1) is 0-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n to be 2;
if the analog quantity signal specification collected by the twin channel of the twin channel module (1) is 0-5V analog quantity signal, the user sets the dial corresponding to the twin channel to be 3.
6. The PLC analog acquisition module of claim 1, wherein the PLC analog acquisition module is configured to perform long-range anti-electromagnetic interference transmission of analog signals, and further configured to: the dialing rule output method of the first dialing module (8) comprises the following steps:
step a, collecting dial position information;
step b, if the dial of the '1' is a '1' bit, S1 is equal to 1; if the "1" dial is "2", S1 is 2; if the "1" dial is "3", S1 is 3;
if the 2-digit is 1, S2 is 1; if the 2-digit dial is 2, S2 is 2; if the 2-digit dial is 3, S2 is 3;
if the "3" dial is a "1" bit, S3 is 1; if the 3-digit is 2, S3 is 2; if the 3-digit dial is 3, S3 is 3;
……
if the dial of 'n' is '1', Sn is 1; if the dial of 'n' is '2', Sn is 2; if the dial of 'n' is '3', Sn is 3;
and c, outputting channel specification signals S1, S2 and S3 … … Sn, and returning to the step a.
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