KR100811452B1 - Remote module for use in PLC system and control method thereof - Google Patents

Abstract

Disclosed are a remote module for a programmable logic controller (PLC) system and a control method thereof. The remote module of the present invention can transmit and receive predetermined data from the master module of the PSI system, and receive various control commands to control the predetermined mechanical device. The remote module has a dummy operation mode that can be replaced and used while maintaining various settings of the existing PSI system when the replacement module is used instead of the extension type remote module included in the installed PSI system. Accordingly, it is possible to simply replace the existing extension type remote module by using a cheaper general type remote module, while maintaining the setting of the already installed PSI system, and furthermore, the quick communication connection initial speed can be improved by applying the quick mode. It can be applied in various ways, so that the network configuration becomes convenient and can be applied to various application environments.

PISH, Extension type, Remote module, Dummy word, Quick mode, Dummy mode

Description

Remote module for PFC system and its control method {Remote module for use in PLC system and control method

1 is a view of a Pelsi system according to the present invention,

2 is a block diagram of a remote module in accordance with the present invention.

3 is a diagram showing the length of data according to the operation mode of the remote module.

4 is a flowchart illustrating a dummy mode according to the present invention.

5 is a flow chart for showing the quick mode according to the present invention.

The present invention relates to a remote module for a programmable logic controller (PLC) and a method of controlling the same. More specifically, a general remote module can be used in place of an extension type remote module included in an installed PCI system. In this case, the remote module for the PSI system having a dummy operation mode that can be replaced and used while maintaining the various settings of the existing PSI system, and furthermore, can change and apply the initial speed of the fast communication connection, and the network configuration becomes convenient. The present invention relates to a remote system for a PID system having a quick mode applicable to various application environments, and a control method thereof.

In general, the PSI system configures the system by expanding remote modules to extend the I / O contact of the master module to a long distance. In this case, the remote module performs a slave function including a communication function and an I / O control function with the master module. do.

The master module and the remote module are connected by a predetermined communication protocol, and the remote module may perform an operation corresponding to various control commands received from the master module.

In the PFC system, several tens of remote modules are usually connected to one master module, and each remote module is connected to the master module while starting operation with its own ID (ID), and receives a predetermined control command from the master module. do.

When the power is applied, the remote module initializes its own port and corresponding register, and checks each status register to execute self-diagnosis. After transmitting the double station number check message, the controller waits for a predetermined time and checks the received data. If reception occurs at this time, the remote module stops communication.

This is because there is a remote device using the same station number (ID), and the remote module performs this double check twice, and then transmits the station number, type, and I / O information of the remote module. Then, the data input / output through the I / O contact of the remote module is exchanged.

 As described above, in the case of implementing the PI system on the network, using only a general remote module has a great inconvenience in terms of initial connection speed of communication and input scaling of the module.

Specifically, in a case where a user wants to use each remote module for various purposes by connecting several remote modules on one network, a general remote module in a network configuration may be used only for a specific remote module for initial connection of communication. If you want to speed up or if you want to adjust the initial speed arbitrarily, there is a problem that can not be done with the existing general remote module, there was an inconvenience in network configuration and application.

In the case of a remote module, an extension type remote module is specially used for extension on a network. The extension type remote module can expand an I / O score by mounting an input / output module in a separate communication module. As a remote module, such an extension type remote module usually includes data longer than the length corresponding to the number of input / output contacts, so that the length of the data is longer than the number of input / output contacts, and is added in addition to the number of input / output contacts. The data includes the state information of the remote module. Due to the difference in the data length, there is an inconvenience that a general remote module cannot replace the extended remote module in implementing the PSI system on the network.

The present invention has been made to solve the above-mentioned inconvenience, an object of the present invention is to replace the existing remote control when installed in place of the extension remote module that is already installed in the implementation of the PI system on the network, It is to solve the inconvenience of network configuration by allowing the general remote module to be replaced and used while maintaining the various settings of the system.

In addition, another object of the present invention is to configure the network by allowing each remote module to be used for various purposes by adjusting the initial connection speed of each remote module according to the user's needs when implementing the PSI system on the network In relieving inconvenience.

In order to achieve the above object, in accordance with the present invention, a PLC for a PLC system that operates as a slave to a master module of a programmable logic controller (PLC) system, and is connected to an external device, the remote module for the PLC system is a predetermined Communication interface unit for transmitting and receiving data; An apparatus interface unit including a predetermined number of input contacts and receiving a control result corresponding to the number of the contacts from the external device through the contacts; And

Mode judgment is performed after the self-diagnosis step of initializing its own register and checking the state when power is applied, and in the dummy mode, at least one dummy word is added to replace the status word of the communication module with the data actually input. And a control unit for controlling to virtually increase the number of contacts with the external device.

Preferably, the control unit may perform the quick mode separately or sequentially from the execution of the dummy mode, and in the case of the quick mode, the dual station check signal is transmitted only once to the master module through the communication interface to transmit / receive I / O data. The initial communication start time can be reduced by immediately passing to the communication ready state.

Here, when the number of input contacts is 16 or 32 contacts, the dummy word is preferably 16 bits.

In addition, the remote module for the PSI system of the present invention may further include a dummy mode selection unit for receiving from the user whether to operate in the dummy mode.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a diagram illustrating a PILSI system according to the present invention.

Referring to FIG. 1, a programmable logic controller (PLC) system 100 of the present invention includes a master module 103, a remote module 105, 109, and an extension type remote module 107. do. In the following description, the remote modules 105 and 109 and the extension type remote module 107 are classified into different devices unless otherwise specified.

Basically, the master module 103, the remote module 105, 109, and the extended remote module 107 can form a network while performing communication by a predetermined communication protocol. The remote modules 105 and 109 and the extension type remote module 107 operate as slaves of the master module 103 on the network 101.

The network 101 may include at least one remote module, and overall communication may be controlled by the master module 103. In general, the remote modules 105 and 109 and the extension type remote module 107 may be spaced apart from the master module 103 by a predetermined distance or more.

The master module 103 is connected to the remote modules 105 and 109 and the extended remote module 107 through a predetermined network 101 to control the overall operation of the PSI system 100. In addition, the master module 103 transmits predetermined control data to the remote modules 105 and 109 and the extended remote module 107, and receives the predetermined control results from the remote modules 105 and 109 and the extended remote module 107. do. Here, the control data includes additional information different from the necessary part of the communication protocol. However, hereinafter, the output contact values of the remote modules 105 and 109 and the extended remote module 107 are referred to as 'control data'.

The master module 103 manages basic information about the remote module 105, 109 and the extended remote module 107. The basic information includes the number of input / output contacts of the remote module 105, 109 and the extended remote module 107. Include. The master module 103 transmits / receives data to / from the remote module 105, 109 and the extended remote module 107 with data having a length corresponding to the number of input / output contacts of the remote modules 105, 109 and the extended remote module 107. Therefore, when a plurality of remote modules are connected, the master module 103 may transmit and receive data of different lengths for each remote module.

For example, if the extension type remote module 107 has 16 points for extension in input 16 points, the extension type remote module 107 is a master module 103 with 32-bit control results, that is, 4 bytes (Byte). ) The control result of length is transmitted. Two bytes of the control results transmitted by the extension type remote module 107 are control results received through an input contact, and the remaining two bytes are status information of the extension type remote module 107.

In addition, if the remote module 105,109 has 16 output points, the master module 103 transmits two bytes of control data to the remote module 105,109.

The remote module 105, 109 includes predetermined input / output contacts, receives predetermined control data from the master module 103, controls a mechanical device connected through an output contact, and receives the control result through an input contact to receive the master. Sends predetermined data to module 103.

FIG. 1 illustrates a situation in which the remote module 109 is replaced with the extension type remote module 107, which will be described with reference to FIG. 2.

Hereinafter, the remote module of the present invention will be described with reference to FIG.

2 is a block diagram of a remote module. Referring to FIG. 2, the remote module 200 of the present invention includes a communication interface 201, a memory 203, a device interface 205, a user interface 207, and a controller 209. Corresponds to the remote modules 105 and 109 of 1.

The communication interface unit 201 may connect to the master module 103 through the network 101, receive predetermined control data, output the control data to the control unit 209, and transmit the data received from the control unit 209 to the network 101. ) To the master module 103.

The memory 203 includes various active and inactive memories, and various PI control programs or data of the remote module 200 may be stored.

The device interface unit 205 may include a contact point, which is an input / output terminal with an external device (not shown), and may include functions such as buffering and impedance matching of input / output data. The device interface unit 205 outputs a predetermined control command to an external device (not shown), and receives the control result from the external device (not shown). The number of input and output contacts of the device interface unit 205 is preferably fixed.

The user interface unit 207 receives a predetermined control command from the user, and displays the predetermined control result received from the control unit 209 to the user. 2, the user interface unit 207 includes a station number selector 211 and a dummy mode selector 207, which will be described only for their operation. However, the user interface unit 207 is not limited only to these operations.

The station number selector 211 receives a station number on the network of the remote module 200 from the user and transmits the station number to the controller 209.

The dummy mode selection unit 207 selects one of the 'normal mode' and the 'dummy mode' as an operation mode of the remote module 200 from the user and transmits the selected one to the control unit 209.

'Dummy mode' refers to a method in which the remote modules 105 and 109 of the present invention operate in a form that replaces the extension type remote module 107. The dummy mode relates to a method for transmitting a control result to the master module 103 when the device interface unit 205 of the remote module 105 or 109 includes an input contact.

For example, suppose a user wants to replace an existing extension type remote module (16 input points) with the remote module 200 of the present invention for reasons of failure or the like. When the user wants to use the remote module 200 of the present invention while maintaining various settings of the master module 103 for the purpose of communicating with an existing extension type remote module, the remote module 200 of the present invention. Must match the number of I / O contact and station number of extension type remote module. The station number can be set identically through the station number selection unit 211.

Among the lengths of the data, in particular, with respect to the control result, the data length of the extended type remote module 107 (in the case of 16 input points) has two more bytes including status information and the like, in addition to the two bytes corresponding to the input points. .

In the normal mode, the remote module 200 having the input 16 points transmits a control result of 2 bytes in length to the master module 103. However, the length of the control result of the remote module 200 operating in the dummy mode transmits 4 bytes of data to the master module 103 including 2 bytes of dummy data (dummy word). In this case, two bytes of dummy data are data without information. However, when replacing the remote module 200 of the present invention operating in the dummy mode instead of the extension type remote module, the master module 103 does not need to change settings separately.

The control unit 209 controls the overall operation of the remote module 200, first performs a self-diagnosis step of initializing its own register and checking the state when the power is applied, and not in the dummy mode or the quick mode according to the present invention. In the normal mode, the check signal is transmitted twice, which is a general sequence, and then recognizes the station number and hardware related information, transmits / receives remote module information, and transmits / receives I / O data.

In the dummy mode of the self-diagnosis result, the controller 209 adds at least one dummy word for replacing the status word of the communication module to the data actually input to virtually increase the number of contacts with the external device. To control.

That is, in the normal mode, the control unit 209 transmits a control result having a length corresponding to the number of current input / output contacts in transmitting and receiving a control result with the master module 103. If the operation mode is a dummy mode, In this case, the control unit 209 transmits and receives the control result of the sum of the dummy data and the length data corresponding to the number of current input / output contacts to the master module 103.

In the dummy mode, in order to explain the difference between the control result and the order distinguished from the conventional method, the length of the control result for each operation mode of the remote module is shown in FIG. It will be described in more detail through S5 and S6.

First, the operation of performing the dummy mode will be described with reference to FIG. 4. Steps S5 and S6 are steps additionally added to perform the dummy mode of the present invention, and the remote module 200 relates to the station number and hardware of S3. After checking the information of the own station number and module (company, code, module name, station number, etc.) through the information recognition step, the input module information recognition step of step S4 is performed, and if the dummy mode is designated by the user, After the dummy mode determination step, the input 1 dummy word addition step of step S6 is performed.

The length of the control result for each operation mode indicated by the dummy mode performing operation is when the remote module 200 has 16 input points in (1) of FIG. 3, and (2) indicates that the remote module 200 is input. (3) is the case where the remote module 200 has 16 input points and 16 output points.

For (1), in the normal mode, the length of data to be transmitted to the master module 103 is two bytes, that is, one word. However, when operating in the 'dummy mode', the length of the data to be transmitted to the master module 103 is a total of 4 bytes (2 words) by adding 2 bytes of the dummy word.

In the case of (2), in the normal mode, the length of data to be transmitted to the master module 103 is 4 bytes (2 words). However, when operating in the 'dummy mode', it is shown that the length of data transmitted to the master module 103 is 6 bytes (3 words) in total, plus 2 bytes (1 word) of the dummy word.

In the case of (3), in the normal mode, the length of data to be transmitted to the master module 103 is 2 bytes (1 word), and the length of data (control command for output contact) received from the master module 103 is reduced. The length is also 2 bytes. However, when operating in the 'dummy mode', the length of data transmitted to the master module 103 is a total of 4 bytes (2 words) by adding 2 bytes (1 word) of the dummy word. However, even when operating in the dummy mode, the length of data received from the master module 103 is 2 bytes as it is.

Meanwhile, the quick mode according to the present invention may be performed separately or sequentially from the dummy mode. As shown in FIG. 5, the quick mode is sequentially implemented after the dummy mode of FIG. 4. 5 can be composed of one continuous process as a whole

The quick mode is configured by partially omitting the step of performing the transmission of the second check signal (step S10) and (S 12) only once as in step S17, which was performed twice in the normal mode. Therefore, the initial communication start time can be reduced by immediately passing the module to the communication ready state for transmitting / receiving I / O data for the module to be used in the process of frequent network connection.

In order to set the dummy mode or the quick mode as described above, the master module and the remote module have a network configuration according to the present invention, and then a set for recording a value at a predetermined address among program commands of the master module. In case of SET / GET communication between modules by using command and SET command to read the value of certain address, user sets quick mode or dummy mode, and this information is saved in EEPROM of remote module. Then, the remote module performs the operation in the mode selected by the user, and these settings and operations can be set as many as possible even if the remote location.

The present invention as described above can be implemented in a device and a system. In addition, when the present invention is implemented in computer software, the components of the present invention may be replaced with code segments necessary for performing necessary operations. The program or code segment may be stored in a medium that can be processed by a microprocessor and transmitted as computer data coupled with carrier waves via a transmission medium or communication network.

Media that can be processed by a microprocessor include those capable of transmitting and storing information such as electronic circuits, semiconductor memory devices, ROMs, flash memories, EEPROMs, floppy disks, optical disks, hard disks, optical fibers, wireless networks, and the like. Include. Computer data also includes data that can be transmitted over electrical network channels, optical fibers, electromagnetic fields, wireless networks, and the like.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the above-described specific embodiment, the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

As described above, the remote module for a programmable logic controller (PLC) system according to the present invention operates as a general remote module and receives a predetermined control command from a master module to control a mechanical device as well as control the control device. The result can be sent to the master device.

In addition, when the input extension type remote module operating in the PSI system which is already installed and operating is replaced due to a failure, the remote module of the present invention operates in a dummy mode, which is an operation mode that can be used instead of the input extension type remote module. can do. To this end, the remote module can adjust the size of data transmitted to the master module to replace the input expansion type remote module.

In addition, in the case where the user wants to use each remote module for various purposes by connecting several remote modules on one network, the general remote module in the network configuration can be used to speed up the initial connection of communication only for a specific remote module. In addition, the initial speed can be arbitrarily adjusted by the user, so that the configuration and mode of the PLC system can be applied to various application environments.

Claims (6)

In a remote module for a PSI system, which operates as a slave of a predetermined station number to a master module of a programmable logic controller (PLC) system and is connected to an external device, Communication interface unit for transmitting and receiving a predetermined data with the master module; An apparatus interface unit including a predetermined number of input contacts and receiving a control result corresponding to the number of the contacts from the external device through the contacts; And The control result is transmitted to the master module through the communication interface unit. When the station number is a dummy mode set for the extended slave, the communication module is configured to actually input data to correspond to the data format of the extended slave. And a controller configured to control at least one dummy word for replacing a status word to virtually increase the number of contact points with the external device. The method of claim 1, The control unit performs the quick mode separately or sequentially from performing the dummy mode, but in the quick mode, the dual station check signal is transmitted to the master module once through the communication interface to communicate for I / O data transmission and reception. A remote module for a PSI system, characterized in that to immediately switch to the ready state. The method of claim 1, And the dummy word is 16 bits when the number of the input contacts is 16 or 32 contacts. The method of claim 1, And a dummy mode selection unit for receiving an input from a user whether or not to operate in the dummy mode. In the control method of the PSI system, In the dummy mode for the extended slave configuration, a dummy operation step of adding at least one dummy word for replacing the status word of the communication module to the actual input data and storing it in the input register, characterized in that it further comprises: How to control PI system. The method of claim 5, And a quick mode operation step of transmitting the check code only once, proceeds separately from the dummy operation step or sequentially after the dummy operation step.

Images