CN114070667A - Method for calling data of Modbus protocol equipment - Google Patents
Method for calling data of Modbus protocol equipment Download PDFInfo
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- CN114070667A CN114070667A CN202111352807.8A CN202111352807A CN114070667A CN 114070667 A CN114070667 A CN 114070667A CN 202111352807 A CN202111352807 A CN 202111352807A CN 114070667 A CN114070667 A CN 114070667A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005192 partition Methods 0.000 claims abstract description 32
- 238000004891 communication Methods 0.000 claims description 10
- 238000012163 sequencing technique Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012549 training Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/403—Bus networks with centralised control, e.g. polling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40228—Modbus
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
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Abstract
The invention discloses a method for calling data of Modbus protocol equipment, which comprises the following steps: under the condition that a plurality of Modbus devices are handled on the same channel, different calling frequencies are managed for each data area of each device, so that the devices with high data updating frequency requirements can be called more quickly, and the devices with low data updating frequency can be called more slowly. The method for calling by adopting Modbus protocol equipment data simultaneously configures the update cycle configuration of calling local partition data to be updated when configuring a data area, and inserts polling data between calling long-cycle data to quickly update the polling data; therefore, bandwidth resources are allocated according to needs, and updating of equipment data in different service periods is met.
Description
Technical Field
The invention particularly relates to a method for calling data of Modbus protocol equipment, and belongs to the technical field of Modbus protocol communication.
Background
Because the Modbus protocol supports traditional RS-232, RS-422, RS-485 and Ethernet devices; in the prior art, various industrial devices such as a PLC, a DCS, an intelligent instrument, a frequency converter and the like use a Modbus protocol as a communication protocol between the industrial devices; through the protocol, control devices produced by different manufacturers can be connected into an industrial network for centralized monitoring; the serial bus is widely applied to a master-slave Modbus protocol due to the limitation of unbalanced transmission characteristics; as shown in fig. 1, the master-slave protocol strictly follows a request response mechanism, and particularly when a master queries data from each slave in a bus, it needs to initiate requests from device node to device node and from register to register; in practical application, the Modbus bus data round training is called, and data instantaneity cannot be guaranteed in a multi-equipment and multi-data scene; as shown in fig. 2, when a plurality of Modbus devices are connected in a hand-in-hand manner on the same channel, the data call policy of the communication manager to each device is a polling call, and when too many devices are connected in a hand-in-hand manner, the time for polling the channel device is prolonged; devices with a relatively high update period under such conditions are subject to physical conditions; the effectiveness of data updating cannot be well met.
Disclosure of Invention
In order to solve the problems, the invention provides a method for calling data of equipment adopting a Modbus protocol, and the data of different calling requirements are met by reasonably distributing bandwidth resources in the same channel.
The invention relates to a method for calling data by adopting Modbus protocol equipment, which comprises the following steps: under the condition that a plurality of Modbus devices are handled on the same channel, different calling frequencies are managed for each data area of each device, so that the devices with high data updating frequency requirements can be called more quickly, and the devices with low data updating frequency can be called more slowly.
Further, the method specifically comprises the following steps:
A. configuring access equipment template information, configuring names, function codes, register addresses, data types, coefficients, partitions and bit information of each point of equipment according to an equipment point table in a specification provided by the access equipment, and finally additionally configuring a partition calling period on a partition;
B. configuring communication link information: reading a link configuration file, and initializing link information including a link number, a baud rate, parity check and a port number;
C. configuring the device template into the communication link: adding the device template configured in the step A and the device address of the corresponding device in the link;
D. regrouping the device configurations in the link by partitions: classifying and sequencing all partitions of all devices in the configured current link according to a calling period, wherein a sequenced list is used as a configuration index of calling data; calling partition data of each device according to the configuration index;
E. calling data and storing the calling data in a database: and analyzing the returned message data obtained by calling each time according to the configuration point table and performing data value storage operation.
Further, the calling period of the step A is configured to be of an integer type of 0-60 minutes in units of minutes.
Further, the cycle configuration of step D is specifically as follows:
when the time is configured to be 0 minute, the system calls the data of the partition in a polling mode, and the data are called fastest in the case; if the configuration is 1 minute, the polling is suspended at every whole minute, and the 1 minute partition data is updated; if the configuration is 2 minutes, starting every two minutes, pausing polling, and after the partition of the 1 minute period is updated, restarting polling the data for one period, pausing polling; starting to update the partition data for a 2 minute period; and so on; and continuing to start polling after completion.
Compared with the prior art, the method for calling by adopting Modbus protocol equipment data configures the update cycle configuration of calling partition data to be updated when a data area is configured, and inserts polling data between calling long cycle data to quickly update the polling data; therefore, bandwidth resources are allocated according to needs, and updating of equipment data in different service periods is met.
Drawings
FIG. 1 is a schematic diagram of Modbus bus data training in the prior art.
FIG. 2 is a schematic diagram of connecting multiple Modbus devices by hand on the same channel in the prior art.
Fig. 3 is a main flow chart of a method for calling data of equipment adopting a Modbus protocol.
Detailed Description
Example 1:
the method for calling the Modbus protocol device data as shown in fig. 3 specifically includes the following steps: under the condition that a plurality of Modbus devices are handled on the same channel, different calling frequencies are managed for each data area of each device, so that the devices with high data updating frequency requirements can be called more quickly, and the devices with low data updating frequency can be called more slowly.
The method specifically comprises the following steps:
A. configuring access equipment template information, configuring names, function codes, register addresses, data types, coefficients, partitions and bit information of each point of equipment according to an equipment point table in a specification provided by the access equipment, and finally additionally configuring a partition calling period on a partition; the call cycle is configured in units of minutes as an integer type from 0 to 60 minutes.
B. Configuring communication link information: reading a link configuration file, and initializing link information including a link number, a baud rate, parity check and a port number;
C. configuring the device template into the communication link: adding the device template configured in the step A and the device address of the corresponding device in the link;
D. regrouping the device configurations in the link by partitions: classifying and sequencing all partitions of all devices in the configured current link according to a calling period, wherein a sequenced list is used as a configuration index of calling data; calling partition data of each device according to the configuration index;
E. calling data and storing the calling data in a database: and analyzing the returned message data obtained by calling each time according to the configuration point table and performing data value storage operation.
The cycle configuration of step D is specifically as follows: when the time is configured to be 0 minute, the system calls the data of the partition in a polling mode, and the data are called fastest in the case; if the configuration is 1 minute, the polling is suspended at every whole minute, and the 1 minute partition data is updated; if the configuration is 2 minutes, starting every two minutes, pausing polling, and after the partition of the 1 minute period is updated, restarting polling the data for one period, pausing polling; starting to update the partition data for a 2 minute period; and so on; and continuing to start polling after completion.
Example 2:
by adopting the data calling method, 5 slow devices and 5 fast devices, 10 slow devices and 10 fast devices, 5 slow devices and 10 fast devices, 10 slow devices and 5 fast devices are respectively used for testing on one link of a communication manager with the same model, and the result shows that the data updating period of each device is stable on the set updating period; the calling speed of the fast equipment is obviously improved, the calling speed of the slow equipment is limited, the period control is effective, and the service requirement is met.
The above-described embodiments are merely preferred embodiments of the present invention, and all equivalent changes or modifications of the structures, features and principles described in the claims of the present invention are included in the scope of the present invention.
Claims (4)
1. A method for calling data of Modbus protocol equipment is characterized by comprising the following steps: under the condition that a plurality of Modbus devices are handled on the same channel, different calling frequencies are managed for each data area of each device, so that the devices with high data updating frequency requirements can be called more quickly, and the devices with low data updating frequency can be called more slowly.
2. The method for calling Modbus protocol equipment data according to claim 1, wherein the method comprises the following steps: the method specifically comprises the following steps:
A. configuring access equipment template information, configuring names, function codes, register addresses, data types, coefficients, partitions and bit information of each point of equipment according to an equipment point table in a specification provided by the access equipment, and finally additionally configuring a partition calling period on a partition;
B. configuring communication link information: reading a link configuration file, and initializing link information including a link number, a baud rate, parity check and a port number;
C. configuring the device template into the communication link: adding the device template configured in the step A and the device address of the corresponding device in the link;
D. regrouping the device configurations in the link by partitions: classifying and sequencing all partitions of all devices in the configured current link according to a calling period, wherein a sequenced list is used as a configuration index of calling data; calling partition data of each device according to the configuration index;
E. calling data and storing the calling data in a database: and analyzing the returned message data obtained by calling each time according to the configuration point table and performing data value storage operation.
3. The method for calling Modbus protocol equipment data according to claim 1, wherein the method comprises the following steps: the calling period of the step A is configured to be of an integer type of 0-60 minutes in units of minutes.
4. The method for calling Modbus protocol device data according to claim 1, wherein the cycle configuration of the step D is as follows:
when the time is configured to be 0 minute, the system calls the data of the partition in a polling mode, and the data are called fastest in the case; if the configuration is 1 minute, the polling is suspended at every whole minute, and the 1 minute partition data is updated; if the configuration is 2 minutes, starting every two minutes, pausing polling, and after the partition of the 1 minute period is updated, restarting polling the data for one period, pausing polling; starting to update the partition data for a 2 minute period; and so on; and continuing to start polling after completion.
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| CN202111352807.8A CN114070667A (en) | 2021-11-16 | 2021-11-16 | Method for calling data of Modbus protocol equipment |
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