CN111880440B - Serial link data acquisition method and system - Google Patents
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Abstract
The invention discloses a serial link data acquisition method and a system, and belongs to the technical field of data acquisition. The method comprises a channel request information control process and an information acquisition process which are carried out simultaneously, so that the information acquisition process is asynchronously controlled. In the channel request information control process, firstly analyzing all channel acquisition configuration information, establishing an acquisition channel information matrix, and initializing acquisition channel information in a control area; then synchronously waiting for a timer event, acquiring system time when the timer event is received, judging whether a certain channel needs to carry out an acquisition request according to an acquisition channel information matrix and the system time, and establishing a channel information list of the acquisition request at the moment; and finally, updating the acquisition channel information of the control area. When the method and the device are adopted, accumulated time delay does not exist, data loss is effectively avoided, and meanwhile, a reasonable channel acquisition period can be recommended.
Description
Technical Field
The invention belongs to the technical field of data acquisition, and particularly relates to a serial link data acquisition method and a system.
Background
The serial link is widely used for data communication in industrial fields, and compared with a network port, the serial link has a large data transmission amount and good stability, so that more than 60% of the industrial fields adopt the serial link for communication. For example, in a common machining field, in order to monitor an operating state of a motor, a sensing module is disposed inside the motor, and then data of the sensing module inside the motor is collected through a serial link. Commonly used serial links are RS232, RS485, RS422, and the like. The serial link is a single link, and when a data acquisition request is sent out, the data request can be sent out only after the data is returned, and information to be acquired cannot be returned while the data request is sent out, which is also a characteristic of the serial link. Therefore, according to the characteristics of the serial link, when a plurality of signals are collected in one request command, the next request can be made only after all the signals are returned, but the process of data return is uncertain.
If a plurality of signals to be acquired are included in the same request command, when the acquisition cycles of the plurality of signals are the same, all the request signals included in the previous request command are also included in the next request command. However, in an actual industrial field, the acquisition cycle or frequency of each signal is not completely the same, for example, the voltage, current, torque, and speed of the motor are acquired, wherein the acquisition cycle of the voltage is 1s, the acquisition cycle of the current is 2s, the acquisition cycle of the torque is 3s, and the acquisition cycle of the speed is 5s, and it is assumed that after the request is issued, data is all returned after 3s, which results in that the current signal and the speed signal are ignored in the next request command, and after the information of the request is returned, the request command is continuously sent, and in the request, the speed signal is lacked, and only in the 15 th s, the request is sent again, so that all the signals are included again, and thus partial data cannot be acquired completely, and a problem of data loss occurs, and it is difficult to effectively monitor the device.
In order to solve the problems, scientific research personnel provide a data acquisition method of a serial link, in the method, after a request instruction is sent out, firstly, the acquisition channel information at the next moment is judged, if the acquisition channel information at the moment is not empty, the acquisition request mark of a certain channel is not empty, and the acquisition period of the channel is different from the period of information return, the acquisition channel information at the next moment is queued for waiting, and in the next request instruction, a request is sent according to the acquisition channel information at the moment for data acquisition. However, with this method, if the acquisition time is long enough, the data loss can be avoided, but the main disadvantage of this method is that the problem of cumulative delay can occur. Meanwhile, in the industrial field, when data are acquired, resetting can be carried out once every certain time of acquisition, and acquisition is carried out again according to the original acquisition requirement. For example, the device is reset once an hour, in this case, due to the problem of accumulated delay, if all data information is collected, more time is required, and if the required time is less than the reset time interval, the collected information is still incomplete, and it is difficult to accurately monitor the device.
In summary, in the case of serial link data acquisition, because the configuration cycles of data gateway acquiring data from the access device are different, some channels may be in an unrecoverable or incomplete state due to accumulated delay or data processing pressure.
Disclosure of Invention
The technical problem is as follows: aiming at the problem that accumulated time delay is easy to occur when serial link data acquisition is carried out in the prior art, so that data of certain channels cannot be acquired or cannot be acquired incompletely, and data loss is caused, a serial link data acquisition method and a system are provided, so that the problem that accumulated time delay occurs when data acquisition is carried out, so that certain channels cannot be acquired or cannot be acquired incompletely is avoided; furthermore, the invention can recommend a reasonable channel acquisition period, so that an operator can determine the optimal acquisition period of each acquisition channel.
The technical scheme is as follows: the invention discloses a serial link data acquisition method, which comprises the following steps: the method comprises the steps of simultaneously carrying out a channel request information control process and an information acquisition process, continuously updating acquisition channel information in a control area through the channel request information control process, reading the acquisition channel information in the control area through the information acquisition process, and carrying out data acquisition according to the read acquisition channel information.
Further, the channel request information control process includes the steps of:
s10: analyzing all channel acquisition configuration information, establishing an acquisition channel information matrix, and initializing acquisition channel information in a control area;
s11: synchronously waiting for a timer event, acquiring system time when the timer event is received, judging whether a certain channel needs to carry out an acquisition request according to an acquisition channel information matrix and the system time, and establishing a channel information list of the acquisition request at the moment;
s12: or operating and updating the acquisition channel information of the control area;
s13: returning to step S11, the process continues to wait for a timer event.
Further, the channel request information control process further includes: acquiring and judging whether the acquisition channel information of the control area is empty, if the channel information which is not requested exists, performing request channel delay alarm, and suggesting to adjust the acquisition period of the channel to the sum of the original acquisition channel period and the timer period.
Further, the information collection process comprises:
s20: acquiring acquisition channel information of a control area;
s21: clearing acquisition channel information of a control area:
s22: sending a data acquisition request according to the acquisition channel information acquired in the step S20;
s23: synchronously waiting for a data response of the serial link;
s24: return is made to step S20.
Further, the acquisition configuration information includes a channel name and an acquisition period, and the acquisition channel information includes a channel name, an acquisition period, and an acquisition request.
The serial link data acquisition system of the present invention comprises:
the channel information request control module is used for executing a channel information request control process and continuously updating the acquisition channel information in the control area;
the information acquisition module is used for executing an information acquisition process, reading acquisition channel information in the control area and acquiring data according to the read acquisition channel information;
the control area information storage module is used for storing the acquisition channel information of the control area, the channel information request control module stores the updated acquisition channel information in the control area information storage module, and then the information acquisition module reads the acquisition channel information from the control area information storage module.
Further, the channel information request control module includes:
the initialization module is used for analyzing all channel acquisition configuration information, establishing an acquisition channel information matrix and initializing acquisition channel information in the control area;
a timer for generating a timer event;
the system time acquisition module is used for waiting for the timer event and acquiring the system time;
the judging module is used for judging whether a certain channel needs to carry out an acquisition request according to the acquisition channel information matrix and the system time, and establishing a channel information list needing the acquisition request at the moment;
and the updating operation module is used for or operating and updating the acquisition channel information of the control area.
Further, the channel information request control module further includes:
the alarm module is used for acquiring and judging whether the acquisition channel information of the control area is empty or not, and if the channel information which is not requested exists, the alarm module carries out request channel delay alarm;
and the period adjusting module is used for adjusting the acquisition period of the channel to the sum of the period of the original acquisition channel and the period of the timer.
Further, the information acquisition module comprises:
the reading module is used for acquiring acquisition channel information of the control area;
the clearing module is used for clearing acquisition channel information of the control area;
and the sending module is used for sending a data acquisition request according to the acquired acquisition channel information.
Has the advantages that: compared with the prior art, the invention has the following advantages:
the method for acquiring the serial link data separates the channel request information control process and the information acquisition process, thereby asynchronously controlling the information acquisition process. In the channel request information acquisition control process, the channel which is not processed in time specified by acquisition configuration can be requested again when the next timer period comes by performing OR operation in the channel request, so that the accumulated delay and data loss are effectively avoided; meanwhile, the invention recommends a reasonable acquisition cycle by controlling the delayed acquisition channel in the area and the current timer cycle, and gives a basic reference to the engineering personnel. Moreover, the invention provides a serial link data acquisition method according to the method, which is convenient for engineering personnel to acquire data by using the system in an industrial field.
Drawings
FIG. 1 is a flow chart of a serial link data acquisition method of the present invention;
FIG. 2 is a schematic diagram of a data acquisition process in an embodiment of the invention;
fig. 3 is a diagram illustrating a channel request information control process according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following examples and the accompanying drawings.
Referring to fig. 1, the method for acquiring serial link data of the present invention includes: the method comprises the steps of simultaneously carrying out a channel request information control process and an information acquisition process, continuously updating acquisition channel information in a control area through the channel request information control process, reading the acquisition channel information in the control area through the information acquisition process, and carrying out data acquisition according to the read acquisition channel information.
The method of the invention separates the channel request information control process and the information acquisition process, thereby asynchronously controlling the acquisition process. By continuously updating the acquisition channel information of the control area, data acquisition can be carried out according to the acquisition channel information of the control area in the information acquisition process, so that the channel which is not processed within the specified time of acquisition configuration can be requested again when the next timer period comes, and the accumulation delay and the data loss are effectively avoided.
In order to more thoroughly describe the method of the present invention, a specific industrial application example is used for description in the present embodiment. As shown in fig. 2, data of the internal sensing module of the motor is collected through a serial link RS485, and the quantity to be collected includes: moment, temperature, rotational speed, noise, vibration, displacement, current and active power, therefore 8 acquisition channels are needed, and each channel is named correspondingly: moment, temperature, rotational speed, noise, vibration, displacement, current and power. The collecting cycle of moment, rotating speed, current and active power is 1s, the collecting cycle of temperature and vibration is 2s, the collecting cycle of noise is 3s, and the collecting cycle of displacement is 5 s. Meanwhile, the response time of the internal sensing module is assumed to be 3s, that is, each time a request command is issued, all the requested data needs to be returned within 3 s.
When the method of the invention is adopted to collect data, the channel request information control process comprises the following steps:
s10: analyzing all channel acquisition configuration information, establishing an acquisition channel information matrix, and initializing acquisition channel information in the control area. The acquisition configuration information includes channel names and acquisition periods, for example, for an industrial example in this embodiment, the acquisition channel names are respectively: moment, temperature, rotational speed, noise, vibration, displacement, electric current and active power, the collection cycle is respectively: 1s, 2s, 1s, 3s, 2s, 5s, 1s and 1 s.
As shown in fig. 3, the acquisition channel information matrix is represented by a graph, wherein a dark block represents an acquisition request, for encoding convenience, an acquisition request is represented as 1, and a white block represents no acquisition request and is represented as 0; the acquisition channel information matrix graphically represented in fig. 3, expressed in mathematical form, can therefore be represented as:
the acquisition channel information includes a channel name, an acquisition period, and an acquisition request, and therefore, in this example, the acquisition channel information after the initialization of the control area is represented by a matrix as:
[1 0 1 0 0 0 1 1]
that is, at the initial time, the channel information collected in the control area can be understood as data of four channels, namely torque, rotating speed, current and active power, which need to be collected. And the channel information of each request can be more conveniently controlled by utilizing the acquisition channel information matrix. The acquisition channel information is continuously updated, so that channels which are not acquired before can be requested when data is requested, and data loss caused by the fact that data of certain channels cannot be acquired is avoided.
S11: synchronously waiting for a timer event, acquiring system time when the timer event is received, judging whether a certain channel needs to carry out an acquisition request according to an acquisition channel information matrix and the system time, and establishing a channel information list needing the acquisition request at the moment.
For example: the period of a timer is 1 second, the acquisition period of a torque channel is 1 second, the acquisition period of temperature is 2 seconds, when the system time is 2020-01-0100: 00:05, the acquisition request identifier of the torque is 1, and the acquisition request identifier of the temperature is 0; when the system time is 2020-01-0100: 00:06, the torque acquisition request is marked as 1, and the temperature acquisition request is marked as 1. Or simply, in the channel information collection matrix, the rows of the matrix represent the channel information list corresponding to the system time. For example, when the system time is 2020-01-0100: 00:05, in the acquisition channel list, the torque acquisition request is identified as 1, the temperature acquisition request is identified as 1, the rotational speed acquisition request is identified as 1, the noise acquisition request is identified as 0, the vibration acquisition request is identified as 0, the displacement acquisition request is identified as 1, the current acquisition request is identified as 1, and the active acquisition request is identified as 1.
S12: or operating and updating the acquisition channel information of the control area. For example: in this embodiment, when the system time is 2020-01-0100: 00:05, the behavior corresponding to the channel information matrix is acquired [ 10100111 ], that is, the channel whose acquisition request is 1 is torque, rotational speed, displacement, current, and active power, and the channel in the control region is [ 11101011 ], that is, the channel whose acquisition request is 1 is torque, temperature, rotational speed, vibration, current, and active power, and after performing or operation, the channel whose acquisition request identifier is 1 in the control region is updated to torque, temperature, rotational speed, vibration, displacement, current, and active power.
The acquisition channel information is updated by performing OR operation in the channel request, so that the channel which is not processed in the previous acquisition process but is ignored can be requested in the next acquisition process, and data loss is avoided. Moreover, although some channels are acquired in the acquisition process in the next acquisition process and have certain delay, the accumulated delay is not caused like the existing method, so that the accumulated delay is effectively avoided.
S13: returning to step S11, the process continues to wait for a timer event. The acquisition channel information of the control area is continuously updated by continuously looping the steps S11 and S12.
Further, in order to determine an optimal acquisition period of a certain channel, the channel request information control step of the method of the present invention further includes: acquiring and judging whether the acquisition channel information of the control area is empty, if the channel information which is not requested exists, performing request channel delay alarm, and suggesting to adjust the acquisition period of the channel to the sum of the original acquisition channel period and the timer period. Specifically, this step is provided between steps S11 and S12. Through the step, a reasonable channel acquisition period can be recommended through the delayed acquisition channel in the control area and the current timer period. For example, if the control area collects channel "noise" information (channel name is noise, collection period is 3 seconds, and collection request is 1), then the "noise" information needs to be updated at this time (channel name is noise, collection period is 4 seconds, and collection request is 1).
Because the acquisition period is not randomly changed in the actual engineering, in the method of the invention, only a reasonable channel acquisition period is recommended, and automatic change is not carried out, if the change is allowed according to the recommended channel acquisition period in the actual engineering, only the operation of automatic change is needed to be set.
When the channel request information control process continuously updates the acquisition channel information of the control area, data acquisition is continuously carried out through the information acquisition process, and the information acquisition process comprises the following steps:
s20: acquiring the acquisition channel information of the control area, wherein for example, when the system time is 2020-01-0100: 00:01, the channels required to be acquired as 1 in the control area are respectively torque, rotating speed, current and active power.
S21: and clearing the acquisition channel information of the control area. Since the acquisition channel information of the control area has already been acquired in step S20, the acquisition channel information of the control area must be cleared in time to store new acquisition channel information so that reading is performed next time.
S22: and sending a data acquisition request according to the acquisition channel information acquired in the step S20. Specifically, the channel that sends the acquisition request is 1, and the channel that sends the acquisition request is 0 is not sent.
S23: the synchronization waits for a data response of the serial link. For example, in the application example illustrated in this embodiment, it is necessary to wait 3s until the data is responded.
S24: returning to step S20, the above steps are repeated, i.e., S20, S21, S22, and S23 are repeated. For example, in the second acquisition cycle, the control area acquiring channel information when the system time is 2020-01-0100: 00:05 is acquired, that is, the channel with the acquisition requirement of 1 is torque, temperature, rotating speed, vibration, displacement, current and active power. It was found that in the second acquisition cycle, all channel information except "noise" could already be acquired.
In the third cycle, channel information is acquired in the control area when the system time is 2020-01-0100: 00:09, that is, the channel whose acquisition demand is 1 is torque, moment, temperature, rotation speed, noise, vibration, current and active power, that is, the acquisition channel information of the control area at this time can be represented by a matrix [ 11111011 ], and it can be found that, in this acquisition, information of "noise" is acquired, although the acquisition time is delayed, accumulation of the acquired channel information does not occur, that is, no accumulation delay occurs, and all the information is acquired without causing data loss.
Based on the serial link data acquisition method of the invention, the invention also provides a serial link data acquisition system, which comprises: the channel information request control module is used for executing a channel information request control process and continuously updating the acquisition channel information in the control area; the information acquisition module is used for executing an information acquisition process, reading acquisition channel information in the control area and acquiring data according to the read acquisition channel information; the control area information storage module is used for storing the acquisition channel information of the control area, the channel information request control module stores the updated acquisition channel information in the control area information storage module, and then the information acquisition module reads the acquisition channel information from the control area information storage module.
Wherein, the channel information request control module includes: the initialization module is used for analyzing all channel acquisition configuration information, establishing an acquisition channel information matrix and initializing acquisition channel information in the control area; a timer for generating a timer event; the system time acquisition module is used for waiting for the timer event and acquiring the system time; the judging module is used for judging whether a certain channel needs to carry out acquisition request according to the acquisition channel information matrix and the system time, and establishing a channel information list needing the acquisition request at the moment; and the updating operation module is used for carrying out OR operation on the acquisition channel information of the updating control area.
Further, the channel information request control module further includes: the alarm module is used for acquiring and judging whether the acquisition channel information of the control area is empty or not, and if the channel information which is not requested exists, the alarm module carries out request channel delay alarm; and the period adjustment recommending module is used for recommending that the acquisition period of the channel is adjusted to be the sum of the original acquisition channel period T _ channel and the timer period T _ timer, namely T _ channel ═ T _ channel + T _ timer.
Further, the information acquisition module comprises: the reading module is used for acquiring acquisition channel information of the control area; the clearing module is used for clearing acquisition channel information of the control area; and the sending module is used for sending a data acquisition request according to the acquired acquisition channel information.
The serial link data acquisition system can avoid accumulated time delay and data loss when the serial link is used for acquisition, thereby better monitoring equipment.
In summary, the present invention provides a method for collecting data of a serial link, which separates a channel request collection information control process from an information collection process, thereby asynchronously controlling the information collection process. In addition, in the channel request information acquisition control process, the channel which is not processed in time specified by acquisition configuration can be requested again when the next timer period comes by performing OR operation in the channel request, so that the accumulated delay and data loss are effectively avoided; meanwhile, the invention recommends a reasonable acquisition cycle by controlling the delayed acquisition channel in the area and the current timer cycle, and gives a basic reference to the engineering personnel. Moreover, the invention provides a serial link data acquisition system according to the method, which can be used for facilitating the data acquisition of engineering personnel in an industrial field.
The above examples are only preferred embodiments of the present invention, it should be noted that: it will be apparent to those skilled in the art that various modifications and equivalents can be made without departing from the spirit of the invention, and it is intended that all such modifications and equivalents fall within the scope of the invention as defined in the claims.
Claims (5)
1. A method for serial link data acquisition, comprising: the method comprises the steps of simultaneously carrying out a channel request information control process and an information acquisition process, continuously updating acquisition channel information in a control area through the channel request information control process, reading the acquisition channel information in the control area through the information acquisition process, and carrying out data acquisition according to the read acquisition channel information;
the channel request information control process includes the steps of:
s10: analyzing all channel acquisition configuration information, establishing an acquisition channel information matrix, and initializing acquisition channel information in a control area;
s11: synchronously waiting for a timer event, acquiring system time when the timer event is received, judging whether a certain channel needs to carry out an acquisition request according to an acquisition channel information matrix and the system time, and establishing a channel information list of the acquisition request at the moment;
s12: or operating and updating the acquisition channel information of the control area;
s13: returning to step S11, continuing to wait for a timer event;
the information acquisition process comprises:
s20: acquiring acquisition channel information of a control area;
s21: clearing acquisition channel information of a control area:
s22: sending a data acquisition request according to the acquisition channel information acquired in the step S20;
s23: synchronously waiting for a data response of the serial link;
s24: return is made to step S20.
2. The method of claim 1, wherein the channel request information control process further comprises: acquiring and judging whether the acquisition channel information of the control area is empty, if the channel information which is not requested exists, performing request channel delay alarm, and suggesting to adjust the acquisition period of the channel to the sum of the original acquisition channel period and the timer period.
3. The method according to claim 2, wherein the acquisition configuration information includes a channel name and an acquisition period, and the acquisition channel information includes a channel name, an acquisition period and an acquisition request.
4. A serial link data acquisition system for implementing the serial link data acquisition method according to any one of claims 1 to 3, comprising:
the channel information request control module is used for executing a channel information request control process and continuously updating the acquisition channel information in the control area; the information acquisition module is used for executing an information acquisition process, reading acquisition channel information in the control area and acquiring data according to the read acquisition channel information; the control area information storage module is used for storing acquisition channel information of the control area, the channel information request control module stores the updated acquisition channel information in the control area information storage module, and then the information acquisition module reads the acquisition channel information from the control area information storage module;
the channel information request control module includes:
the initialization module is used for analyzing all channel acquisition configuration information, establishing an acquisition channel information matrix and initializing acquisition channel information in the control area;
a timer for generating a timer event;
the system time acquisition module is used for waiting for the timer event and acquiring the system time;
the judging module is used for judging whether a certain channel needs to carry out an acquisition request according to the acquisition channel information matrix and the system time, and establishing a channel information list needing the acquisition request at the moment;
the updating operation module is used for or operating and updating the acquisition channel information of the control area;
the information acquisition module includes:
the reading module is used for acquiring acquisition channel information of the control area;
the clearing module is used for clearing acquisition channel information of the control area;
and the sending module is used for sending a data acquisition request according to the acquired acquisition channel information.
5. The system of claim 4, wherein the channel information request control module further comprises:
the alarm module is used for acquiring and judging whether the acquisition channel information of the control area is empty or not, and if the channel information which is not requested exists, the alarm module carries out request channel delay alarm;
and the period adjusting module is used for adjusting the acquisition period of the channel to the sum of the period of the original acquisition channel and the period of the timer.
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| CN109324573A (en) * | 2018-08-31 | 2019-02-12 | 北京北科麦思科自动化工程技术有限公司 | A kind of Embedded data acquisition system and method for SIMATIC TDC system GDM network |
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