JP2007066103A - Method for controlling event processing time - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an event processing time control method for a communication master station, in which much event processing can be executed during the ON of a power supply without extending communication cycle time in one cycle and event processing time suited to a communication phase can be set. <P>SOLUTION: During the execution of a communication cycle, event issue time decision processing and event processing for issuing an event are executed and the event issue time decision processing determines event processing time set in each communication phase and a communication cycle pattern suited to an application purpose on the basis of a current communication phase. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a programmable controller in which a communication master station (one programmable controller device having a communication function) and a communication slave station (one or more I / O terminal devices having a communication function) are connected by a bus network. The present invention relates to a time control method for event processing of a communication master station applied to a system.

  A programmable controller (hereinafter referred to as "PLC") having a communication function and one or more I / O terminal devices having a communication function are connected by a bus network, and the PLC device having the communication function is connected to a communication master station. Each of the I / O terminal devices having a communication function is a communication slave station, and communication (I / O) is periodically performed between the communication master station and the communication slave station.

A conventional communication cycle time is shown in FIG. As shown in the figure, one communication cycle of the communication cycle is composed of an I / O refresh time a and an event processing time b, and the horizontal axis indicates time t. A processing time is set for each of the I / O refresh time a and the event processing time b. When the I / O refresh process or the event process is started, the set time becomes the timer limit time, and each process is performed within the limit time. A PLC system that exchanges various data between such a communication master station and each communication slave station has been known. The “I / O terminal device” here is a generic term for an input terminal device, an output terminal device, and an input / output terminal device. In addition, the event control method of a control apparatus has been developed conventionally (for example, refer patent document 1).
JP 11-149303 A

  However, since the communication slave station joining process is performed according to an event, when there are a large number of communication slave stations on the network, the event process frequently occurs during the joining process after the power is turned on. Therefore, in order to speed up the time for executing the communication slave station join processing, it is necessary to increase the event processing time in one cycle. That is, as shown in FIG. 10, if the event processing time is set to be long, the event processing time b in the figure becomes long, and the time t increases accordingly. When the event time is set to be long, many subscription processes are allocated, so the subscription process itself is accelerated, but the communication cycle time is increased accordingly.

  In addition, depending on the usage and scale of the PLC, event processing may not be required in the normal cycle after the subscription processing. When the event time is set to be short, the communication cycle time can be shortened, but there is a problem that the joining process is delayed accordingly.

  The present invention has been made by paying attention to the above-mentioned problems, and the object of the present invention is to make it possible to execute a lot of event processing at the time of power-on without increasing the communication cycle time in one cycle. It is an object of the present invention to provide an event processing time control method for a communication master station that can set an appropriate event processing time.

  Other objects and operational effects of the present invention will be easily understood by those skilled in the art by referring to the following description of the specification.

  According to the communication master station event processing time control method of the present invention, one programmable controller device having a communication function and one or more I / O terminal devices having a communication function are connected to each other by a bus-type network. A programmable controller device having a function is a communication master station and each I / O terminal device having a communication function is a communication slave station. In a communication cycle consisting of I / O refresh processing and event processing, each communication phase is On the other hand, the present invention is applied to a programmable controller system in which communication based on a communication cycle pattern is performed between a communication master station and each communication slave station by setting an event processing time.

  More specifically, the method of the present invention executes event processing in which event issuance time determination processing and event issuance are performed after confirming the joining / leaving of the communication slave station at the time of execution of the communication cycle. Issuance time determination processing is characterized in that event processing time set for each communication phase and a communication cycle pattern suitable for the purpose of use are determined according to the current communication phase.

  The “programmable controller system” mentioned here is formed by connecting one programmable controller device having a communication function and one or more I / O terminal devices having a communication function via a bus network. “Communication slave station subscription” means that the communication slave station is connected to the network and is communicable with the communication master station.

  According to such a configuration, the event time of each phase can be set, and a PLC system suitable for the user's purpose of use can be realized.

  In a preferred embodiment of the present invention, the event issuance time determination process is an I / O that prioritizes subscription solicitation and event transmission without sending a data communication frame to the communication master station and a data communication frame to the communication slave station. It is to determine a communication cycle pattern including a communication cycle without communication and a communication cycle with I / O that performs a normal operation of I / O.

  According to such a configuration, the communication cycle pattern can be switched according to each phase, so that the processing can be executed efficiently.

  In another preferred embodiment of the present invention, the event issuance time determination process includes a phase at the time of initial communication slave station subscription after power-on, a phase at the time of no event request after the initial communication slave station subscription, Corresponds to the current communication phase from the communication phase consisting of the phase when there is a low priority event request after joining the communication slave station and the phase when there is a high priority event request after joining the initial communication slave station The communication phase may be determined, and the event processing time set for each communication phase may be allocated as the event time.

  According to such a configuration, since the event for joining the communication slave station can be prioritized, the joining process of the communication slave station is performed in a short time even in a programmable controller system in which other events are constantly occurring. be able to.

  In another preferred embodiment of the present invention, the communication cycle without I / O includes a beacon frame for notifying the communication slave station of the current network information, confirmation of the existence of the communication slave station, and from the slave station. A trigger frame that simultaneously permits data transmission, a connect frame that responds to the presence confirmation from the communication master station to the communication slave station, and an event processing group that is performed within the event time allocated in the event issue time determination process , May be configured.

  According to such a configuration, priority is given to the joining process and event transmission without executing the output frame and the input frame, so that the event time can be set longer during the joining process after the power is turned on.

  In another preferred embodiment of the present invention, the communication cycle with I / O includes a beacon frame for notifying a communication slave station of current network information, and an output frame for transmitting data to the communication slave station. This is performed within the event time allocated by the connection frame for responding to the communication slave station from the communication master station, the input frame for transmitting data to the communication master station, and the event issue time determination process. An event processing group may be included.

  According to such a configuration, since the event time can be set short during the normal communication cycle, the communication cycle time during the normal communication cycle can be shortened.

  According to the present invention, a large number of event processes can be executed when the power is turned on without increasing the communication cycle time in one cycle, and an event processing time suitable for the communication phase can be set. Furthermore, priority is given to event processing at the time of power-on, so that even in a PLC system in which other event processing is always occurring, communication slave station subscription processing can be performed in the shortest time.

  Hereinafter, a preferred embodiment of a time control method for event processing of a communication master station according to the present invention will be described in detail with reference to the accompanying drawings.

  A block diagram of the entire PLC system including a communication master station and a communication slave station is shown in FIG. As shown in the figure, this PLC system includes a PLC device 1 having a communication function as a communication master station, and I / O terminal devices 2, 2... Having a plurality of communication functions as communication slave stations. Are connected by a field bus 6 which is a bus network. In the figure, 4 is a repeater that functions as a relay device, and 5 is a termination device that reduces reflection at the end of the fieldbus.

  The illustrated PLC device 1 has a large number of connectors arranged on a backplane (not shown) on which a parallel bus is laid, and a CPU unit, an I / O unit, various other special function units, etc. are connected to these connectors. A so-called building block type PLC device that can be arbitrarily attached is employed. In particular, in this example, a “PLC device having a communication function” is configured by attaching a communication master unit to one connector on the backplane. In the figure, among these units, only the CPU unit 20 and the communication master unit 10 are denoted by reference numerals.

  A hardware configuration diagram showing an internal configuration of the communication master unit 10 is shown in FIG. As shown in the figure, the communication master unit 10 includes a communication interface (communication I / F) 101 that functions as a communication physical layer, and a master ASIC 102 that is a circuit that realizes a desired communication function as an LSI. , A buffer area for transmission / reception data exchanged with the CPU unit 20, a RAM 103 functioning as a calculation work area for the MPU 104 to be described later, and an MPU 104 mainly composed of a microprocessor for controlling the entire apparatus. A nonvolatile memory (EEPROM) 105 in which various setting data are stored, an LED display unit 106 for performing various operation displays, and a setting switch (setting SW) 107 used for various setting operations. And functioning as an interface to the internal bus leading to the CPU unit 20 Bus interface and an (internal bus I / F) 108.

  As is well known to those skilled in the art, in this type of PLC system, the CPU unit 20 repeatedly executes a common process, an I / O refresh process, a user program execution process, a peripheral service process, and the like. When executing the I / O refresh process, the I / O refresh process is performed not only between the local I / O unit mounted on the backplane but also with the RAM 103 in the communication master unit 10. Execute.

  Specifically, the OUT data in the I / O memory of the CPU unit 20 is written to the OUT area in the RAM 103 of the communication master unit 10, and the IN data in the RAM 103 is stored in the I / O memory of the CPU unit 20. Written in the IN area.

  On the other hand, as will be described in detail later, communication via the field bus 6 is performed between the communication master unit 10 and each I / O terminal device 2 asynchronously with the I / O refresh operation of the CPU unit 20. As a result, a kind of I / O refresh process is also executed between each I / O terminal device 2 and the RAM 103 in the communication master unit 10.

  Specifically, the IN data received from the I / O terminal device (see FIG. 1) 2 is written in the IN area of the RAM 103 in the communication master unit (see FIG. 1) 10 and OUT in the OUT area of the RAM 103. Data is transmitted to the corresponding I / O terminal device 2.

  In this way, the I / O refresh process is executed between the I / O memory in the CPU unit 20 and each I / O terminal device 2, 2,... As described above, the CPU unit 20 can handle I / O devices connected to the remotely installed I / O terminal devices 2, 2,.

  Further, the event time control operation of the present invention is executed when a communication completion interrupt is made. The communication completion interrupt is sent from the master ASIC 102 to the MPU 104 after a predetermined time set when the master ASIC 102 starts the communication cycle.

  Next, FIG. 3 shows a hardware configuration diagram inside the I / O terminal device. As shown in the figure, the I / O terminal device 2 is a master for an LSI that includes a communication interface (communication I / F) 201 functioning as a communication physical layer and a circuit for realizing a desired communication function. ASIC 202, MPU 203 mainly composed of a microprocessor for controlling the entire apparatus, nonvolatile memory (EEPROM) 204 for storing various setting data, and LED display for performing various operation displays Unit 205, a setting switch (setting SW) 206 used for various setting operations, an external interface unit (I / F unit) 207 for exchanging data with I / O device 7, a device And a DC power supply unit 208 having a transforming function for supplying a stabilized DC power supply as a whole.

  As described in detail later, between the communication master unit 10 and each I / O terminal device 2, the communication master unit 10 is a communication master station, and each I / O terminal device 2 is a communication slave station. I / O data and various messages are exchanged through N-to-N master / slave communication.

  Specifically, the OUT data received from the communication master unit 10 is sent to the I / O device 7 via the I / F unit 207 of the I / O terminal device 2, and is sent from the I / O device 7 to the I / O device 7. The IN data taken into the I / O terminal device 2 via the F unit 207 is transmitted to the communication master unit 10.

  Next, FIG. 4 shows a general flowchart showing the operation of event time control which is the main part of the present invention. As shown in the figure, when the above-mentioned communication completion interrupt is performed, confirmation of the joining / leaving of the communication slave station is performed (step 401), and the I / O terminal device 2 is connected (joined) via the field bus 6. ) Or disconnection (separation), whether or not the communication slave station has joined is confirmed by a frame transmitted and received between the communication master station and the communication slave station.

  A schematic diagram of frame transmission / reception in the connection confirmation phase is shown in FIG. As shown in the figure, an alive confirmation frame (Alive_Frame) AF is transmitted from the communication master station. When a survival confirmation frame is received by the communication slave station and the repeater, a connect frame (CN_Frame) CF is sent from the communication slave station to the communication master station for responding to the presence confirmation from the communication master station to the communication slave station. The The communication master station can confirm whether or not a communication slave station or a repeater is connected by receiving the connect frame CF.

  An example of the structure of the connect frame (CN_Frame) is shown in FIG. As shown in the figure, the connect frame (CN_Frame) includes a start 1101 indicating the start of the frame, a command 1102 indicating the connect frame (CN_Frame), and an address 1103 indicating the slave that has transmitted the connect frame (CN_Frame). , An alarm 1104 indicating a message type or a message transmission request, and a CRC 1105 for detecting a frame abnormality.

  Returning to the flowchart of FIG. 4, when confirmation of the joining / leaving of the communication slave station is performed (step 401), event processing is performed (step 402). The event processing will be described in detail later.

  When event processing is completed (step 402), I / O refresh processing on the communication master station side is performed (step 403). Specifically, the OUT data in the I / O memory of the CPU unit 20 is written to the OUT area in the RAM 103 of the communication master unit 10, and the IN data in the RAM 103 is stored in the I / O memory of the CPU unit 20. Written in the IN area.

  When the I / O refresh process on the communication master station side is completed (step 403), a communication cycle pattern is determined (step 404). Depending on whether or not I / O is required depending on the current communication phase, the type of communication cycle is properly used. Specifically, in the case of “when the initial slave joins after power-on”, the communication cycle pattern without I / O is applied, “when there is no event request after joining the initial slave”, “after the initial slave join” In the case of “low-priority event request” or “high-priority event request after initial slave joining (such as during slave joining)”, the communication cycle pattern with I / O is applied.

  An explanatory diagram showing the communication cycle pattern applied in the communication cycle pattern determination process (step 404) is shown in FIG. As shown in FIG. 5A, the I / O-less cycle includes a beacon frame (BEACON_Frame) 601 for notifying the communication slave station of the current transmission rate, the presence confirmation of the communication slave station, and A network synchronization frame (trigger frame, TRG_Frame) 602 for simultaneously permitting data transmission from the communication slave station, a connect frame (CN_Frame) 603 for responding to the presence confirmation from the communication master station to the communication slave station, and an event A group 604 is included. This I / O-free cycle is a communication cycle that prioritizes event subscription and event issuance processing without sending an output frame (OUT_Frame) and an input frame (IN_Frame), and is used in the power-on phase. Is done.

  Also, as shown in FIG. 5B, the I / O presence cycle includes a beacon frame (BEACON_Frame) 601, confirmation of the existence of a communication slave station, data transmission to the communication slave station, and data from the communication slave station. An output frame (OUT_Frame) 605 for performing transmission permission at the same time, a connect frame (CN_Frame) 603, an input frame (IN_Frame) 606 for performing data transmission to the master station, and an event group 604 are included. . This cycle with I / O is a communication cycle for performing a normal operation of I / O.

  In this example, the frames that can be transmitted only by the communication master station include (1) output frame (OUT_Frame), (2) trigger frame (TRG_Frame), and (3) beacon frame (BEACON_Frame). There is a frame.

  As frames that can be transmitted only by the communication slave station, there are two types of frames: (1) connect frame (CN_Frame) and (2) input frame (IN_Frame).

  As shown in FIG. 6B, the communication cycle includes an output frame (OUT_Frame) transmitted from the master, a connect frame (CN_Frame) transmitted from the slave specified by the output frame (OUT_Frame) to the master, and an IN slave. Followed by the input frame (IN_Frame) sent from. The start timing of the communication cycle between the master unit and each slave is adjusted upon completion of normal reception of the output frame (OUT_Frame). Since the connect frame (CN_Frame), the input frame (IN_Frame), and the number of frames to be transmitted are fixed, the transmission timing of each frame is the start timing of the normal transmission completion of the output frame (OUT_Frame). It can be performed by a predetermined time monitoring.

  An example of the structure of the output frame (OUT_Frame) is shown in FIG. As shown in the figure, the output frame (OUT_Frame) includes a start 1201 indicating the start of the frame, a command 1202 indicating the output frame (OUT_Frame), and a CN_frame transmission request address indicating a slave requesting transmission of the connect frame (CN_Frame). 1203, a length 1204 indicating the data length of OUT data, OUT data 1205 storing output data to the OUT slave, and a CRC 1206 for detecting a frame abnormality.

  The master manages where the output data addressed to each OUT slave is assigned to the output frame (OUT_Frame), and each OUT slave assigns the output data received by its own station to the output frame (OUT_Frame). Is notified from the master before the communication cycle starts.

  An example of the structure of the input frame (IN_Frame) is shown in FIG. As shown in the figure, an input frame (IN_Frame) has a start 1301 indicating the start of the frame, a command 1302 as the input frame (IN_Frame) type, and an address 1303 indicating the slave that transmitted the input frame (IN_Frame). , A length 1304 indicating the data length of the IN data, IN data 1305 storing input data from the IN slave, and a CRC 1305 for detecting a frame abnormality.

  The master manages the time at which each IN slave transmits after the output frame (OUT_Frame) is normally received, and before the communication cycle starts, the master inputs the input frame (to the IN slave or MIX slave). (IN_Frame) transmission timing is notified. Each IN slave holds a timing value for transmitting an input frame (IN_Frame) notified from the master, and each IN slave transmits an input frame (IN_Frame) according to the value.

  The input frame (IN_Frame) can be transmitted to the master by the IN slave, but since the OUT slave cannot issue the input frame (IN_Frame), it has means for making a message communication request in the input frame (IN_Frame). I can't let you. For this reason, a means for making a message communication request is provided in a connect frame (CN_Frame) that can be issued by all types of slaves.

  A schematic diagram of frame transmission / reception in the normal communication cycle phase is shown in FIG. As shown in the figure, the communication master station transmits an output frame (OUT_Frame) OF or a network synchronization frame (trigger frame, TRG_Frame) TF to the communication slave station. When the output frame OF is received by the communication slave station, only the data used by the own node is extracted and received. When the trigger frame TF is received, an internal timer is started, and an input frame (IN_Frame) is transmitted to the communication master station when the transmission time arrives.

  An example of correspondence between alarm bits and message types is shown in FIG. The alarm is composed of a single bit or a plurality of bits, and the correspondence between the alarm bit and the message type is established in advance between the master and each slave.

  Next, message communication will be described. The structure of the frame used for message communication is shown in FIG. As shown in the figure, the message frame includes a start 1501 indicating the start of the frame, a command 1502 indicating the message frame, a destination address 1503 indicating the destination node of the message frame, and a source node of the message frame. A source address 1504 indicating the length, a length 1505 indicating the data length of the message data, message data 1506 corresponding to the message type, and a CRC 1507 for detecting a frame abnormality. There are several uses for message frames: frames that allow message frames to be transmitted, event frames for transferring data, ACK frames that indicate that message data has been received normally, and BUSY frames that indicate that message data cannot be received The above-mentioned command field is used for these distinctions.

  Unlike the I / O communication cycle shown in FIG. 6B, the message frame is transmitted and received in a communication cycle called a message communication cycle. The message communication cycle is inserted only when the master sends a message or when the slave requests message communication from the master and the master permits it.

  The relationship between the communication cycle and the message cycle is shown in FIG. As shown in FIG. 5A, when a message communication cycle is not inserted, an I / O communication cycle 01600, an I / O communication cycle 11601, an I / O communication cycle 21602, and an I / O communication cycle 31603 are executed. Then, as shown in FIG. 5B, when the message communication cycle is transmitted and received, the message communication cycle 1611 is inserted into the I / O communication cycles 1610 and 1612.

First, a case where a message is first transmitted from the master to the slave will be described. When a message type for requesting message communication from the master to the slave is specified in the previous connect frame (CN_Frame), the master transmits a message to the slave according to its importance. The flow of message communication in this case is shown below.
1. The master starts 1501, a command 1502 indicating an event frame, the address of the slave that has requested message transmission is the destination address 1503, the address of its own station is the source address 1504, and the length of the data length is 1505 according to the amount of message data to be transmitted. , Message data 1506 and CRC 1507 are generated for the content of the message, and a message frame is transmitted.
2. The slave determines whether it is destined for its own station based on the destination address 1503 of the received message frame. If it is not addressed to the local station, the frame is discarded.
3. When the slave determines that it is addressed to its own station by the destination address 1503, when the frame is normally received, the start 1501, a command 1502 indicating an ACK frame, the master address as the destination address 1503, its own address as the source address 1504, and the CRC 1507 Set and send a message. If the frame cannot be received normally, start 1501, a command 1502 indicating a BUSY frame, the master address is the destination address 1503, the local station address is the source address 1504, the data length “0” is the length 1505, and an appropriate value is the CRC 1506. Set to and send the message.

  FIG. 17 shows a message cycle when a message is transmitted from the master to the slave. As shown in the figure, a plurality of event frames 1701 and 1702 may be transmitted and received within one message communication cycle.

Next, a case where a message is transmitted from the slave to the master will be described. In this case, message communication is as follows.
1. The master starts 1501, a command 1502 indicating a message transmission permission frame, the address of the slave that has requested the message transmission permission, the destination address 1503, the address of the local station, the source address 1504, the data length “0”, the length 1505, appropriate A correct value is set in the CRC 1506 and a message frame is transmitted.
2. The slave determines whether it is addressed to its own station based on the received message frame destination address 1503. If it is not addressed to the local station, the frame is discarded.
3. The slave that is determined to be addressed to the own station by the destination address 1503 starts 1501, a command 1502 indicating an event frame, the master address is the destination address 1503, the source master address is the source address 1504, and the amount of message data to be transmitted The data length is set to length 1505, the message content is set to message data 1506, and CRC 1507 is set, and the message is transmitted.
4). The master and the slave determine whether or not they are addressed to the local station based on the destination address 1503 of the received message frame. If it is not addressed to the local station, the frame is discarded.
5. When the master determines that it is addressed to the own station by the destination address 1503, if the frame is normally received, the start 1501, a command 1502 indicating an ACK frame, the source address of the message 1503, the destination address 1503, the address of the own station, the source address 1504 , CRC1507 is set and a message is transmitted. When the frame cannot be normally received, the start 1501, the command 1502 indicating the BUSY frame, the destination address 1503 of the source address of the message, the source address 1504 of the own station address, and the CRC 1507 are set, and the message is transmitted.

  FIG. 18 shows a message cycle when a message is transmitted from the slave to the master. As shown in the figure, the master may transmit a plurality of message transmission permission frames 1801 and 1803 and allow the slave to transmit a plurality of event frames 1811 within one message communication cycle.

  A specific example in which message communication is performed between the slave and the master is the command field of the message frame shown in FIG. Message data is not always included in a message frame.

  Returning to the flowchart of FIG. 4, when a communication cycle pattern is determined (step 404), a communication cycle is started based on the corresponding communication cycle pattern (step 405), and between the communication master station and the I / O terminal device. Then, an I / O refresh process is performed (step 406). Specifically, the OUT data received from the communication master unit 10 is sent to the I / O device 7 via the I / O unit 207 of the I / O terminal device 2, and is sent from the I / O device 7 to the I / O device 7. The IN data taken into the I / O terminal device 2 via the O unit 207 is transmitted to the communication master unit 10.

  A flowchart showing details of the event processing (step 402) is shown in FIG. As shown in the figure, when event processing is performed, event issue time determination processing described in detail later is performed (step 801).

  When the event issuance time determination process is performed (step 801), the event is issued only when the event exists (step 802). The event issuance is continued until the time specified in the event issuance time determination process (step 801) is reached (NO in step 803). When the designated time is reached (YES in step 803), the event issuing process ends.

  FIG. 9 shows a flowchart showing details of the event issuance time determination process (step 801). As shown in the figure, when the event issuance time determination process is performed, it is determined whether or not the current communication phase is “adding initial slave” (step 901). If the current phase is joining the initial slave (from the start of master operation until the communication slave station confirms the existence of all the communication slave stations after adding one communication slave station) (step 901 YES), issue an event The time is allocated at the time of initial slave joining (step 902). If the current phase is not joining the initial slave (step 901 NO), it is determined whether or not the current phase is “waiting for high priority event” (step 903). If the current phase is waiting for an event with a high priority (YES in step 903), an event request time with a high priority is assigned as the event issue time (step 904). If the current phase is not waiting for an event with a high priority (NO in step 903), it is determined whether or not the current phase is “waiting for an event with a low priority” (step 905). If the current phase is waiting for an event with a low priority (YES in step 905), an event issue time with a low priority is assigned as an event issue time (step 906). If the current phase is not waiting for an event with a low priority (NO in step 905), the event issue time is assigned a time when there is no event request (step 907).

  Thus, by applying the event processing time control method of the communication master station according to this embodiment, it is possible to execute a lot of event processing at power-on without increasing the communication cycle time in one cycle, and in the communication phase. A suitable event processing time can be set. Furthermore, priority is given to event processing at the time of power-on, so that even in a PLC system in which other event processing is always occurring, communication slave station subscription processing can be performed in the shortest time.

  According to the present invention, a large number of event processes can be executed when the power is turned on without increasing the communication cycle time in one cycle, and an event processing time suitable for the communication phase can be set. Furthermore, priority is given to event processing at the time of power-on, so that even in a PLC system in which other event processing is always occurring, communication slave station subscription processing can be performed in the shortest time.

It is a block diagram of the PLC system containing a master unit and a slave unit. It is a hardware block diagram of a master unit. It is a hardware block diagram of a slave unit. It is a general flowchart which shows the operation | movement of event time control of this invention. It is a schematic diagram of frame transmission / reception in the connection confirmation phase. It is explanatory drawing which shows the communication cycle pattern of this invention. It is a schematic diagram of transmission / reception of a frame in a communication cycle phase. It is a detailed flowchart which shows an event process. It is a detailed flowchart which shows the issue time determination process of an event. It is explanatory drawing which shows the conventional communication cycle time. It is a figure which shows the structure of a connection frame (CN_Frame). It is a figure which shows the structure of an output frame (OUT_Frame). It is a figure which shows the structure of an input frame (IN_Frame). It is the figure which showed the response | compatibility of an alarm bit and a message. It is a figure which shows the structure of a message frame. It is a figure showing the relationship between an I / O communication cycle and a message communication cycle. It is a figure showing the message cycle in the case of transmitting a message from a master to a slave. It is a figure showing the message cycle in the case of transmitting a message from a slave to a master. It is the figure which showed the meaning of the command field of a message frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 PLC apparatus which has a communication function 2 I / O terminal apparatus which has a communication function 3 Personal computer 4 Repeater 5 Termination apparatus 6 Fieldbus 7 I / O equipment 10 Communication master unit 20 CPU unit 101 Communication interface 102 Master ASIC
103 RAM
104 MPU
105 EEPROM
106 LED display 107 Setting switch (Setting SW)
108 Internal Buzz Interface 201 Communication Interface 202 ASIC for Slave
203 MPU
204 EEPROM
205 LED display section 206 Setting switch (setting SW)
207 External interface section (I / F section)
208 Power supply 601 Beacon frame 602 Network synchronization frame (trigger frame)
603 Connect frame 604 Event group 605 Output frame 606 Input frame 1101 Start 1102 Command 1103 Address 1104 Alarm 1105 CRC
1201 Start 1202 Command 1203 CN_frame transmission request address 1204 Length 1205 OUT data 1206 CRC
1301 Start 1302 Command 1303 Address 1304 Length 1305 IN Data 1306 CRC
1501 Start 1502 Command 1503 Destination address 1504 Source address 1505 Length 1506 Message data 1507 CRC
1600 I / O communication cycle 0
1601 I / O communication cycle 1
1602 I / O communication cycle 2
1603 I / O communication cycle 3
1610 I / O communication cycle 0
1611 Message communication cycle 1612 I / O communication cycle 1
1701 Event frame 1702 Event frame 1711 ACK or BUSY frame 1712 ACK or BUSY frame 1801 Message transmission permission frame 1802 ACK or BUSY frame 1803 Message transmission permission frame 1811 Event frame AF existence confirmation frame CN connect frame OF output frame TF network synchronization frame (trigger flame)
IF input frame a I / O refresh time b Event processing time t time

Claims (5)

A programmable controller device having a communication function and one or more I / O terminal devices having a communication function are connected by a bus network, and the programmable controller device having the communication function is used as a communication master station and has a communication function. Each I / O terminal device having a communication slave station is set as a communication slave station, and in a communication cycle composed of I / O refresh processing and event processing, by setting event processing time for each communication phase, a communication master A communication master station event processing time control method applied to a programmable controller system adapted to perform communication based on a communication cycle pattern between a station and each communication slave station,
At the time of communication cycle execution, after confirming that the communication slave station has joined or disconnected, execute event processing that performs event issue time determination processing and event issuance,
Further, the event issuance time determination process determines an event processing time set for each communication phase and a communication cycle pattern suitable for the purpose of use according to the current communication phase. Time control method for event processing. The event issue time determination process is as follows:
A communication cycle without I / O prioritizing subscription solicitation and event transmission without flowing a data communication frame to the communication master station and a data communication frame to the communication slave station,
A communication cycle with I / O for normal I / O operation;
2. The event processing time control method for a communication master station according to claim 1, wherein a communication cycle pattern suitable for a purpose of use is determined by determining a communication cycle pattern comprising: The event issue time determination process is as follows:
Phase when initial communication slave station joined after power-on,
Phase when there is no event request after joining the initial communication slave station,
Phase when there is a low priority event request after initial communication slave station subscription,
Phase when there is a high priority event request after joining the initial communication slave station,
The communication master according to claim 2, wherein a communication phase corresponding to the current communication phase is determined from the communication phase consisting of: and an event processing time set in each communication phase is allocated as an event time. Station event processing time control method. Communication cycle without I / O is
A beacon frame that notifies the communication slave station of the current network information;
A trigger frame that simultaneously checks the existence of a communication slave station and permits data transmission from the slave station,
A connect frame that responds to the presence confirmation from the communication master station to the communication slave station,
Event processing group that is performed within the event time allocated in the event issue time determination process, and
4. The event processing time control method for a communication master station according to claim 3, comprising: Communication cycle with I / O is
A beacon frame that notifies the communication slave station of the current network information;
An output frame for transmitting data to the communication slave station;
A connect frame that responds to the presence confirmation from the communication master station to the communication slave station,
An input frame for transmitting data to the communication master station;
Event processing group that is performed within the event time allocated in the event issue time determination process, and
4. The event processing time control method for a communication master station according to claim 3, comprising:

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