JP2014191724A - Input/output control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an input/output control device capable of stopping the signal output of a machine tool to a component when any communication abnormality occurs between a numerical control device and itself under an environment in which communication quality is unsatisfactory.SOLUTION: The input/output control device includes: an identical data communication interval monitoring part 5 for detecting abnormality on the basis of the reception intervals of data whose sequence numbers are the same; a sequence data communication interval monitoring part 4 for detecting abnormality on the basis of the reception intervals of the data whose sequence numbers are different by a set number. The input/output control device is configured to, when at least one of the identical data communication interval monitoring part 5 and the sequence data communication interval monitoring part 4 detects abnormality, notify a numerical control device 1 of abnormality detection, and to stop the signal output of a machine tool to a component 2.

Description

  The present invention relates to an input / output control device that performs data communication with a numerical control device that performs numerical control processing or the like of a machine tool and performs input / output of signals to / from equipment in the machine tool.

  Conventionally, in a system in which a host controller and a node to which a plurality of actuators and sensors are connected are connected in series, each node outputs data to the actuator when the reception interval of the data frame signal from the main controller exceeds a predetermined time. There is a serial control device that forcibly turns off (see Patent Document 1).

  When the sending terminal transmits a control information frame with an update cycle sequence number that counts up every update period, and the receiving terminal measures the frame reception interval and exceeds the preset update cycle There is a monitoring device and a monitoring method in cyclic communication for notifying an error (see Patent Document 2).

  The present invention relates to a communication device and a failure determination method in the communication device. In an in-vehicle network system in which a plurality of nodes are connected via a bus, the reception interval of a received message is compared with a threshold value stored in a volatile memory. When it is short, there is a method of determining that the node that transmitted the frame is a failure (see Patent Document 3).

  The purpose of the conventional communication equipment is to quickly determine the link status of the data link layer. The reception status of the flags that arrive sequentially within a certain interval is monitored, and if the flag cannot be received within a certain aircraft, it is determined that the link is broken. There is a method of setting a monitoring function to be performed on the transmission / reception side (see Patent Document 4).

  In a loop optical communication network in a double loop configuration, to stabilize the system reconfiguration operation when one station repeatedly goes down and recovers, a configuration hold signal is output from the controller to immediately cancel the loopback configuration. The normal configuration is restored by deleting the configuration holding signal (see Patent Document 5).

Japanese Patent No. 2512832 JP 2009-141473 A JP 2009-171310 A JP 2004-207878 A Japanese Patent Laid-Open No. 61-15444

  As for the output from the numerical controller to the input / output controller, there is a case where the same data is transmitted a plurality of times because the communication line may be unstable.

  Patent Documents 1 and 2 check that the data reception interval exceeds a predetermined time and check that the data sequence number is continuous for each update period. In a system that cannot determine normality / abnormality of data by using different reception intervals, and in a system that guarantees communication by transmitting the same data a plurality of times, there are cases where the abnormality is erroneously detected.

  In Patent Documents 1 and 3, it is possible to check that the data reception interval has exceeded a predetermined time and to determine abnormality when the reception interval is shorter than a predetermined value. It is not possible to determine whether the focused reception interval is normal or abnormal.

  In Patent Document 4, the link state is determined by monitoring the reception state of the valid / invalid flag according to the internal state of the device. However, a malfunction occurs due to a circuit error or a bit error of a register in the device due to a software error. I can't prevent you from doing it.

  In Patent Document 5, it is possible to prevent a system control unit from sending a configuration holding signal and automatically transition to a normal state when an abnormality occurs, but an abnormality notification means to a station other than the abnormality generating station or an abnormality is detected. There is no means for normally clearing the cause of abnormality of all devices, and it is impossible to prevent the input / output control device from malfunctioning.

  The present invention has been made in view of the above, and can stop signal output to machine tool components when a communication error occurs with a numerical control device in an environment with poor communication quality. An object is to obtain an input / output control device.

  In order to solve the above-described problems and achieve the object, the present invention is connected to a numerical control device that repeatedly outputs data having the same sequence number a plurality of times while changing the sequence number. An input / output control device that outputs an input signal to a numerical control device, and outputs a signal to a component of a machine tool based on data input from the numerical control device, and receiving intervals of data having the same sequence number The same data communication interval monitoring unit that detects an abnormality based on the sequence data communication interval monitoring unit that detects an abnormality based on the reception interval of data having a different number of sequence numbers, and the same data communication interval monitoring unit, When at least one of the sequence data communication interval monitoring units detects an abnormality, it notifies the numerical control device of the abnormality detection and Wherein the stop signal output to the machine configuration device.

  According to the present invention, it is possible to detect an abnormality in the machine tool when the reception interval of the same data is not appropriate or when the reception interval of sequence data is not appropriate.

FIG. 1 is a diagram showing a configuration of a first embodiment of an input / output control apparatus according to the present invention. FIG. 2 is a diagram showing the configuration of the communication interval management table. FIG. 3 is a diagram for explaining a monitoring period of data abnormality detection. FIG. 4 is a flowchart showing an operation flow of the same data communication interval monitoring unit. FIG. 5 is a diagram showing a flow of operations of the sequence data communication interval monitoring unit. FIG. 6 is a diagram showing a configuration of the input / output control apparatus according to the second embodiment of the present invention. FIG. 7 is a diagram illustrating an operation flow of the input / output control apparatus according to the second embodiment. FIG. 8 is a diagram showing the configuration of the third embodiment of the input / output control apparatus according to the present invention. FIG. 9 is a diagram showing a flow of processing for managing the communication operation mode for the numerical control device. FIG. 10 is a diagram showing details of processing for confirming the communication interval state. FIG. 11 is a diagram showing details of status transition processing. FIG. 12 is a diagram illustrating an example of an operation sequence from abnormality detection to abnormality factor clearing in a system using the input / output control device according to the third embodiment.

  Embodiments of an input / output control device according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration of a first embodiment of an input / output control apparatus according to the present invention. The input / output control device 3 (3 ₁ , 3 ₂ , 3 ₃ ) converts the digital data output from the numerical control device 1 into an analog signal and outputs the analog signal to the machine tool component 2 or the machine tool component 2 Is converted into digital data and output to the numerical controller 1. The input / output control device 3 (3 ₁ , 3 ₂ , 3 ₃ ) includes a sequence data communication interval monitoring unit 4 (4 ₁ , 4 ₂ , 4 ₃ ) and an identical data communication interval monitoring unit 5 (5 ₁ , 5 ₂ , 5 ₃ ) and a communication interval management table 6 (6 ₁ , 6 ₂ , 6 ₃ ). Sequence data communication interval monitor section _{4 1} has a free running counter 41 _1. Although not shown, also the sequence data communication interval monitor section 4 _2, 4 _3, has the same free running counter and sequence data communication interval monitor section 4 _1. Same data communication interval monitor section _{5 1} includes a free run counter 51 ₁ and the data comparison buffer 52 _1. Although not shown, the same data communication interval monitor section 5 _2, 5 ₃ also has the same free running counter to the same data communication interval monitor section 5 _1. In the following description, items common to the input / output control devices 3 ₁ , 3 ₂ , 3 ₃ will be described, and will be referred to as the input / output control device 3 when it is not necessary to distinguish them. The same applies to each functional unit in the input / output control device 3.

A plurality of input / output control devices 3 are connected in series, and a machine tool component 2 is connected to each station. The output control unit 3 ₁ located at one end of the plurality of input-output control unit 3 connected in series, the numerical value input device 1 is connected.

  FIG. 2 is a diagram showing the configuration of the communication interval management table. The communication interval management table 6 includes a station number 12, a shortest communication interval 13, a longest communication interval 14, a sequence number 15, a check frame number 17, a shortest communication interval 18, and a longest communication interval 19. The station number 12 is a station number set for the own station. The shortest communication interval 13 is a threshold value (second shortest communication interval) for determining that an abnormality has been detected when data having a predetermined number of sequence numbers is received at intervals shorter than a set value. The longest communication interval 14 is a threshold value (second longest communication interval) for determining that an abnormality has been detected when data having a predetermined number of different sequence numbers is received at an interval longer than a set value. The sequence number 15 is a sequence number of received data at the start of monitoring when monitoring the reception interval of data having a predetermined number of different sequence numbers. The number 17 of check frames is a value indicating how many frames of data reception intervals are monitored (how many data reception intervals with different sequence numbers are monitored). For example, when “2” is set in the number 17 of check frames, the sequence data communication interval monitoring unit 4 starts monitoring the sequence data reception interval from the data of the sequence number “1”. Whether or not there is an abnormality is determined based on an interval until data having a sequence number “3”, which is the sum of the value of the check frame number 17 and the value of the check frame number 17, is received.

  The shortest communication interval 18 is a threshold value (first shortest communication interval) for determining that an abnormality has been detected when the same data is received at an interval shorter than a set value. The longest communication interval 19 is a threshold value (first longest communication interval) for determining that an abnormality has been detected when the same data is received at an interval longer than a set value.

  FIG. 3 is a diagram for explaining a monitoring period of data abnormality detection. Here, the operation in the input / output control device 3 in which “1” is set as the station number is taken as an example. The data address represents the station number of the destination input / output control device 3. It is assumed that “2” is set in the check frame number 17. The numerical control apparatus 1 repeats outputting data having the same sequence number a plurality of times while changing the sequence number. Data having the same sequence number and address (for example, data 111a and data 111b) are the same data, and are output from the numerical control device 1 at regular intervals. Further, data having the same address but different sequence numbers are output from the numerical controller 1 at regular intervals. As an example, data with different sequence numbers “2” (for example, data 111 a and data 113 a) are output from the numerical control device 1 at regular intervals. Note that the interval at which data having the same address but different sequence numbers is output from the numerical controller 1 becomes longer as the difference between the sequence numbers increases.

  The input / output control device 3 starts the monitoring operation when the data 111a is received. At this time, the sequence data communication interval monitoring unit 4 sets “1” to the sequence number 15 in the communication interval management table 6. Further, the same data communication interval monitoring unit 5 holds the data 111 a in the data comparison buffer 52.

  The same data communication interval monitoring unit 5 and the sequence data communication interval monitoring unit 4 confirm the address described in the header when receiving the data 211a and 311a. Since the address of the data 211a is “2” and the address of the data 311a is “3” and does not match “1” set in the station number 12 of the communication interval management table 6, the same data communication interval and sequence data communication Continue monitoring the interval.

  The same data communication interval monitoring unit 5 and the sequence data communication interval monitoring unit 4 confirm the address described in the header when receiving the data 111b. The address of the data 111b is “1”, which matches “1” set in the station number 12 of the communication interval management table 6, and the data 111b is the same as the data 111a held in the data comparison buffer 52. It is. For this reason, the same data communication interval monitoring unit 5 sets the interval from the reception of the data 111a to the reception of the data 111b as the same data communication interval, and the presence or absence of abnormality is compared with the shortest communication interval 18 and the longest communication interval 19. Judging. The same data communication interval monitoring unit 5 holds the data 111b in the data comparison buffer 52 and newly starts monitoring the same data communication interval. On the other hand, since the sequence number “1” of the data 111b does not match the sum of the value “1” of the sequence number 15 and the value “2” of the check frame number 17, the sequence data communication interval monitoring unit 4 Continue monitoring.

  The same data communication interval monitoring unit 5 and the sequence data communication interval monitoring unit 4 confirm the address described in the header when receiving the data 211b and 311b. Since the address of the data 211b is “2” and the address of the data 311b is “3” and does not match “1” set in the station number 12 of the communication interval management table 6, the same data communication interval and sequence data communication Continue monitoring the interval.

  The same data communication interval monitoring unit 5 and the sequence data communication interval monitoring unit 4 confirm the address described in the header when receiving the data 112a. The address of the data 112 a is “1”, which matches “1” set in the station number 12 of the communication interval management table 6, but is not the same as the data 111 b held in the data comparison buffer 52. Therefore, the same data communication interval monitoring unit 5 holds the data 112a in the data comparison buffer 52 and continues monitoring the same data communication interval. Further, since the sequence number “2” of the data 112a does not match the sum of the value “1” of the sequence number 15 and the value “2” of the check frame number 17, the sequence data communication interval monitoring unit 4 Continue monitoring.

  When the same data communication interval monitoring unit 5 and the sequence data communication interval monitoring unit 4 receive the data 212a and 312a, they check the address described in the header. Since the address of the data 212a is “2” and the address of the data 312a is “3” and does not match “1” set in the station number 12 of the communication interval management table 6, the same data communication interval and sequence data communication Continue monitoring the interval.

  When the same data communication interval monitoring unit 5 and the sequence data communication interval monitoring unit 4 receive the data 112b, they check the address described in the header. The address of the data 112 b is “1”, matches the “1” set in the station number 12 of the communication interval management table 6, and is the same as the data 112 a held in the data comparison buffer 52. For this reason, the same data communication interval monitoring unit 5 sets the interval from the reception of the data 112a to the reception of the data 112b as the same data communication interval, and whether there is an abnormality by comparing the shortest communication interval 18 and the longest communication interval 19. Judging. The same data communication interval monitoring unit 5 holds the data 112b in the data comparison buffer 52 and newly starts monitoring the same data communication interval. On the other hand, since the sequence number “2” of the data 112b does not match the sum of the value “1” of the sequence number 15 and the value “2” of the check frame number 17, the sequence data communication interval monitoring unit 4 Continue monitoring.

  When the same data communication interval monitoring unit 5 and the sequence data communication interval monitoring unit 4 receive the data 212b and 312b, they confirm the address described in the header. Since the address of the data 212b is “2” and the address of the data 312b is “3” and does not match “1” set in the station number 12 of the communication interval management table 6, the same data communication interval and sequence data communication Continue monitoring the interval.

  The same data communication interval monitoring unit 5 and the sequence data communication interval monitoring unit 4 confirm the address described in the header when receiving the data 113a. The address of the data 113 a is “1”, which matches “1” set in the station number 12 of the communication interval management table 6, but is not the same as the data 112 b held in the data comparison buffer 52. Therefore, the same data communication interval monitoring unit 5 holds the data 113a in the data comparison buffer 52 and continues monitoring the same data communication interval. On the other hand, since the sequence number “3” of the data 113a matches the sum of the value “1” of the sequence number 15 and the value “2” of the check frame number 17, the sequence data communication interval monitoring unit 4 stores the data 111a. The interval from reception to reception of data 113a is defined as the sequence data communication interval, and the presence or absence of abnormality is determined by comparison with the shortest communication interval 13 and the longest communication interval 14. The sequence data communication interval monitoring unit 4 sets “1” to the sequence number 15 in the communication interval management table 6 and newly starts monitoring the sequence data communication interval.

  Thereafter, the same data communication interval and sequence data communication interval are determined in the same manner as described above.

  Next, the operation of the same data communication interval monitoring unit 5 will be described. FIG. 4 is a flowchart showing an operation flow of the same data communication interval monitoring unit. As initialization processing, values input from the numerical controller 1 are set in the shortest communication interval 18 and the longest communication interval 19 (step S21).

  After the initialization process is completed, the same data communication interval monitoring unit 5 clears the free-run counter 51 in order to start the operation of the same data communication interval monitoring unit 5 (step S22).

  After the operation starts, the same data communication interval monitoring unit 5 determines whether or not the value of the free-run counter 51 exceeds the value set in the longest communication interval 19 (step S23). When it exceeds (Yes in step S23), the same data communication interval monitoring unit 5 detects the longest communication interval abnormality, notifies the numerical control device 1 of the occurrence of the longest communication interval abnormality, and the machine tool. The signal output to the component device 2 is stopped (step S24), and the process proceeds to step S21.

  When the value of the free run counter 51 does not exceed the value set in the longest communication interval 19 (step S23 / No), the same data communication interval monitoring unit 5 is the same as the data held in the data comparison buffer 52. It is determined whether or not the data has been received (step S25). If not received (step S25 / No), the same data communication interval monitoring unit 5 determines whether data different from the data held in the data comparison buffer 52 has been received (step S2a). If received (step S2a / Yes), the same data communication interval monitoring unit 5 stores the received data in the data comparison buffer 52 (step S2b). Then, the same data communication interval monitoring unit 5 counts up the free-run counter 51 (step S29) and returns to step S23.

  When the same data as the data held in the data comparison buffer 52 is not received (step S2a / No), the same data communication interval monitoring unit 5 counts up the free-run counter 51 (step S29). The process returns to step S23.

  When the same data as the data held in the data comparison buffer 52 is received (step S25 / Yes), the same data communication interval monitoring unit 5 sets the value of the free-run counter 51 to the shortest communication interval 18. It is determined whether it is smaller than the value (step S26). When the value of the free run counter 51 is smaller than the value set in the shortest communication interval 18 (step S26 / Yes), the same data communication interval monitoring unit 5 detects the shortest communication interval abnormality and the occurrence of the shortest communication interval abnormality occurs. Is sent to the numerical controller 1 and signal output to the machine tool component 2 is stopped (step S27), and the process proceeds to step S21.

  When the value of the free-run counter 51 is equal to or greater than the value set in the shortest communication interval 18 (step S26 / No), the same data communication interval monitoring unit 5 clears the free-run counter 51 (step S28). The same data communication interval monitoring unit 5 counts up the free-run counter 51 (step S29) and returns to step S23.

  Next, the operation of the sequence data communication interval monitoring unit 4 will be described. FIG. 5 is a diagram showing a flow of operations of the sequence data communication interval monitoring unit. As an initialization process, the sequence data communication interval monitoring unit 4 sets the values input from the numerical controller 1 to the shortest communication interval 13, the longest communication interval 14, and the check frame number 17 (step S31).

  After completion of the initialization process, the sequence data communication interval monitoring unit 4 clears the free-run counter 41 in order to start the operation (step S32).

  After starting the operation, the sequence data communication interval monitoring unit 4 determines whether or not the value of the free-run counter 41 exceeds the value set in the longest communication interval 14 (step S33). If it has exceeded (step S33 / Yes), the sequence data communication interval monitoring unit 4 detects the longest communication interval abnormality, notifies the numerical controller 1 of the occurrence of the longest communication interval abnormality, and The signal output to the component device 2 is stopped (step S34), and the process proceeds to step S31.

  If the value of the free run counter 41 does not exceed the value set in the longest communication interval 14 (step S33 / No), is the sequence data communication interval monitoring unit 4 receiving data having a normal sequence number? It is determined whether or not (step S35). When data having a normal sequence number has not been received (step S35 / No), the sequence data communication interval monitoring unit 4 counts up the free-run counter 41 (step S39) and returns to step S33.

  When data having a normal sequence number is received (step S35 / Yes), the sequence data communication interval monitoring unit 4 determines whether the value of the free run counter 41 is smaller than the value set in the shortest communication interval 13. (Step S36). When the value of the free-run counter 41 is smaller than the value set in the shortest communication interval 13 (step S36 / Yes), the sequence data communication interval monitoring unit 4 detects the shortest communication interval abnormality and the shortest communication interval abnormality occurs. Is sent to the numerical controller 1 and signal output to the machine tool component 2 is stopped (step S37), and the process proceeds to step S31.

  When the value of the free-run counter 41 is equal to or larger than the value set in the shortest communication interval 13 (step S36 / No), the sequence data communication interval monitoring unit 4 clears the free-run counter 41 (step S38). The sequence data communication interval monitoring unit 4 counts up the free run counter 41 (step S39), and returns to step S33.

  When the same data communication interval monitoring unit 5 and the sequence data communication interval monitoring unit 4 perform the above-described operation, when the illegal data communication is detected within the shortest communication interval, or when the same or normal order exceeds the longest communication interval. When data cannot be transmitted / received, the input / output control device 3 can detect an abnormality.

  According to the present embodiment, the same data transmitted by the numerical control device a plurality of times and the data assigned with the correct sequence number in an environment with poor communication quality in which a device that becomes a noise source such as a motor and other machine tools operates. By monitoring each communication interval, when there is an abnormality in the communication intervals of a plurality of data to which sequence numbers are assigned, it is possible to stop the signal output to the machine tool component.

  According to the present embodiment, it is possible to check the communication interval for each of the same data and data to which the correct sequence number is assigned, and to stop signal output to the machine tool component when an abnormality occurs.

Embodiment 2. FIG.
FIG. 6 is a diagram showing a configuration of the input / output control apparatus according to the second embodiment of the present invention. The input / output control device 3 according to the second embodiment includes an input terminal 42 for inputting a signal for determining validity / invalidity of the sequence data communication interval monitoring unit 4 and the same data communication interval monitoring unit 5. The data communication interval monitoring unit 4 and the same data communication interval monitoring unit 5 are configured to be able to store valid / invalid setting contents in a nonvolatile manner. The sequence data communication interval monitoring unit 4 and the same data communication interval monitoring unit 5 monitor the sequence data communication interval and the same data communication interval when the valid setting is made through the input terminal 42. On the other hand, the sequence data communication interval monitoring unit 4 and the same data communication interval monitoring unit 5 do not monitor the sequence data communication interval and the same data communication interval when the invalid setting is made via the input terminal 42. .

  FIG. 7 is a diagram illustrating an operation flow of the input / output control apparatus according to the second embodiment. The input / output control device 3 monitors whether data has been received (step S51). When data is not received (step S51 / No), monitoring is continued until data is received.

  When the data is received (step S51 / Yes), the input / output control device 3 checks whether the sequence data communication interval monitoring unit 4 and the same data communication interval monitoring unit 5 are enabled (step S52). If the sequence data communication interval monitoring unit 4 and the same data communication interval monitoring unit 5 are disabled (step S52 / No), the input / output control device 3 performs processing for monitoring the communication interval of sequence data and communication of the same data. Do not perform processing to monitor the interval.

  If the sequence data communication interval monitoring unit 4 and the same data communication interval monitoring unit 5 are enabled (step S52 / Yes), the input / output control device 3 causes the sequence data communication interval monitoring unit 4 to execute sequence data communication interval monitoring processing. (Step S53), the same data communication interval monitoring unit 5 is caused to perform the same data communication interval monitoring process (Step S54).

  According to the present embodiment, by having a function for determining valid / invalid fixedly by hardware terminals, only valid data can be accepted without depending on the register state in the apparatus. As a result, it is possible to determine whether the received data is valid / invalid without depending on the internal state of the input / output control device 3, and by not outputting invalid data to the machine tool component 2, abnormal operation of the machine tool can be performed. Can be prevented.

Embodiment 3 FIG.
FIG. 8 is a diagram showing the configuration of the third embodiment of the input / output control apparatus according to the present invention. The input / output control apparatus according to the third embodiment includes a communication interval monitoring unit notification mode management unit 7.

  The communication interval monitoring unit notification mode management unit 7 is a functional unit for changing the notification mode of the same data communication interval monitoring unit 5 and the sequence data communication interval monitoring unit 4.

  In the present embodiment, the sequence data communication interval monitoring unit 4 and the same data communication interval monitoring unit 5 have two notification modes, a normal notification mode and an abnormality notification mode. The normal notification mode is a mode for notifying the numerical controller 1 of abnormality information when the sequence data communication interval monitoring unit 4 and the same data communication interval monitoring unit 5 detect an abnormality. The abnormality notification mode is a mode for forcibly reporting abnormality information from the input / output control device 3 to the numerical control device 1 (notifying abnormality information preferentially to the numerical control device 1 when an abnormality occurs). When the data other than the data for controlling the abnormal state is received from 1, the input / output control device 3 notifies the abnormality information.

  FIG. 9 is a diagram showing a flow of processing for managing the communication operation mode for the numerical control device. When an abnormality has occurred in the input / output control device 3, the communication interval monitoring unit notification mode management unit 7 starts up with the abnormality detection state as the initial state of the status (step S61).

  The communication interval monitoring unit notification mode management unit 7 confirms the communication interval state (step S62). FIG. 10 is a diagram illustrating details of the process for confirming the communication interval state (the process in step S62). The communication interval monitoring unit notification mode management unit 7 checks whether or not the abnormality factor clear data has been received (step S81). When the abnormality factor clear data is received (step S81 / Yes), the communication interval monitoring unit notification mode management unit 7 sets the communication interval state to “normal” (step S85). When the abnormality factor clear data has not been received (step S81 / No), the communication interval monitoring unit notification mode management unit 7 determines whether or not there is an abnormality in the communication interval state (step S82). If there is an abnormality in the communication interval of the same data or sequence data (step S82 / Yes), the communication interval monitoring unit notification mode management unit 7 sets the communication interval state to "abnormal" and outputs the output to the component 2 of the machine tool. Stop (step S83). If there is no abnormality in the communication interval of the same data or sequence data (step S82 / No), the communication interval monitoring unit notification mode management unit 7 confirms whether abnormality notification data has been received from the numerical controller 1 (step S84). . When the abnormality notification data is received (step S84 / Yes), the communication interval monitoring unit notification mode management unit 7 sets the communication interval state to “abnormal” and stops the output to the machine tool component 2 (step S83). . When the abnormality notification data is not received (step S84 / No), the communication interval monitoring unit notification mode management unit 7 sets the communication interval state to “normal” (step S85).

  When the communication interval state is confirmed, the communication interval monitoring unit notification mode management unit 7 performs a status transition process (step S63). FIG. 11 is a diagram illustrating details of status transition processing (processing in step S63). The communication interval monitoring unit notification mode management unit 7 checks whether or not the received data is data for shifting to the normal notification mode (step S71). When the data is the transition data to the normal notification mode (step S71 / Yes), the communication interval monitoring unit notification mode management unit 7 changes the status to an abnormal non-detection state (step S74), and ends the status transition processing. If the data is not the transition data to the normal notification mode (step S71 / No), the communication interval monitoring unit notification mode management unit 7 checks whether or not the received data is the transition data to the abnormality notification mode (step S72). When the data is not the transition data to the abnormality notification mode (step S72 / No), the communication interval monitoring unit notification mode management unit 7 ends the status transition process. When the data is the transition data to the abnormality notification mode (step S72 / Yes), the communication interval monitoring unit notification mode management unit 7 changes the status to the abnormality detection state (step S73), and ends the status transition process.

  When the status transition process is completed, the communication interval monitoring unit notification mode management unit 7 checks the status (step S64). If the status is an abnormal non-detection state (step S64 / abnormal non-detection state), the communication interval monitoring unit notification mode management unit 7 sets the operation mode to the normal notification mode (step S66). If the status is the abnormality detection state (step S64 / abnormality detection state), the communication interval monitoring unit notification mode management unit 7 sets the operation mode to the abnormality notification mode (step S65).

  FIG. 12 is a diagram illustrating an example of an operation sequence from abnormality detection to abnormality factor clearing in a system using the input / output control device according to the third embodiment.

Output control unit 3 ₁ receives the data transmitted from the numerical control apparatus 1 (A1). When data from the numerical control device 1 to the output control unit 3 ₁ addressed is transmitted, the input-output control unit 3 for the ₁ failure has not occurred, the sequence data communication interval monitor section 4 and the same data communication interval monitor section None of 5 detects an abnormality. Output control unit 3 ₁ performs the processing of the communication interval monitor section notification mode management unit 7. At this time, since steps S82, S83, and S84 in FIG. 10 are all No, the communication interval state is “normal”. Therefore, output control unit 3 _1, returns a normal response to the numerical controller 1 (A2). In addition, since steps S71 and S72 in FIG. 11 are both No and the initial status is the abnormality detection state, the operation mode is the abnormality notification mode.

Output control unit 3 ₂ receives the data transmitted from the numerical control apparatus 1 (A3). Before the data from the numerical control apparatus 1 to the input-output control unit 3 ₂ destined than being transmitted to the output control unit 3 ₂ because a failure has occurred, the sequence data communication interval monitor section 4 and the same data communication An abnormality is detected in at least one of the interval monitoring units 5. Output control unit 3 ₂ performs processing of communication interval monitor section notification mode management unit 7. At this time, since step S82 in FIG. 10 is No and S84 is Yes, the communication interval state is “abnormal”. Therefore, the input-output control unit _{3 2} notifies the abnormality to the numerical controller 1 (A4). Further, since steps S71 and S72 in FIG. 11 are both No and the initial status is the abnormality detection mode, the operation mode is the abnormality notification mode.

Numerical controller 1 is notified of the abnormality from the output control unit 3 _2, (in this example output control unit 3 ₁₎ All input-output control unit except for the abnormality notification source transmits to the abnormality notification ( A5). When abnormality notification to the output control unit 3 ₁ destined from the numerical control apparatus 1 is transmitted, the input-output control unit 3 for the ₁ failure has not occurred, the sequence data communication interval monitor section 4 and the same data communication interval monitor None of the parts 5 detect an abnormality. Output control unit 3 ₁ performs the processing of the communication interval monitor section notification mode management unit 7. At this time, Steps S81 and S82 in FIG. 10 are No, and S84 is Yes, so the communication interval state is “abnormal”. Therefore, output control unit _{3 1} notifies the abnormality to the numerical controller 1 (A6). Further, since both Steps S71 and S72 of FIG. 11 are No, the operation mode is the same abnormality notification mode as the previous time.

The user of the numerical controller 1 or the numerical controller 1, after the abnormality notification to analyze the abnormality cause, if it is determined that the returnable performs a process of clearing the cause of the abnormality output control unit 3 ₂ (A7).

The numerical controller 1 sends normal notification mode transition data to all the input / output control devices (in this example, the input / output control devices 3 ₁ and 3 ₂ ) (A8, A10). When the numerical controller 1 is the normal notification mode transition data is transmitted, since a failure in the output control unit 3 ₁ has not occurred, any sequence data communication interval monitor section 4 and the same data communication interval monitor section 5 Abnormality is not detected. Output control unit 3 ₁ performs the processing of the communication interval monitor section notification mode management unit 7. At this time, since steps S81, S82, and S84 in FIG. 10 are all No, the communication interval state is “normal”. Therefore, output control unit 3 ₁ notifies the transition completion as a normal response to the numerical controller 1 (A9). Moreover, since step S71 of FIG. 11 becomes Yes, an operation mode changes to normal notification mode.

When the numerical controller 1 is the normal notification mode transition data is transmitted, because the fault occurring in the input-output control unit 3 ₂ are eliminated, any sequence data communication interval monitor section 4 and the same data communication interval monitor section 5 Does not detect any abnormalities. Output control unit 3 ₂ performs processing of communication interval monitor section notification mode management unit 7. At this time, since steps S81, S82, and S84 in FIG. 10 are all No, the communication interval state is “normal”. Therefore, the input-output control unit 3 ₂ notifies the transition completion as a normal response to the numerical controller 1 (A11). Moreover, since step S71 of FIG. 11 becomes Yes, an operation mode changes to normal notification mode.

Numerical controller 1, when all the input-output control unit 3 _1, 3 completion of the transition from the ₂ to the normal detection mode is notified and sends an abnormal source clear data to all input and output control unit 3 _1, 3 ₂ ( A12, A14). When numerical abnormalities factor clear data from the control apparatus 1 is transmitted, since a failure in the output control unit 3 ₁ has not occurred, any sequence data communication interval monitor section 4 and the same data communication interval monitor section 5 abnormal Is not detected. Output control unit 3 ₁ performs the processing of the communication interval monitor section notification mode management unit 7. At this time, since step S82 of FIG. 10 is Yes, the communication interval state is “normal”. Therefore, output control unit _{3 1} returns a normal response to the numerical controller 1 (A13). Also, since steps S71 and S72 in FIG. 11 are both No, the operation mode is the same normal notification mode as the previous time.

When abnormal factor clear data from the numerical control apparatus 1 is transmitted, for the input-output control unit 3 ₂ no failure occurs, none of the sequence data communication interval monitor section 4 and the same data communication interval monitor section 5 abnormal Is not detected. Output control unit 3 ₂ performs processing of communication interval monitor section notification mode management unit 7. At this time, since step S82 in FIG. 10 is Yes, the communication interval state is “normal”. Therefore, the input-output control unit _{3 2} returns a normal response to the numerical controller 1 (A15). Also, since steps S71 and S72 in FIG. 11 are both No, the operation mode is the same normal notification mode as the previous time.

When the numerical controller 1 receives a normal response to the abnormality factor clear data from all the input / output control devices 3 ₁ and 3 ₂ , the numerical control device 1 sends the abnormality notification mode transition data to all the input / output control devices 3 ₁ and 3 ₂ (A16). , A18). When the numerical controller 1 is the normal notification mode transition data is transmitted, since a failure in the output control unit 3 ₁ has not occurred, any sequence data communication interval monitor section 4 and the same data communication interval monitor section 5 Abnormality is not detected. Output control unit 3 ₁ performs the processing of the communication interval monitor section notification mode management unit 7. At this time, since steps S81, S82, and S84 in FIG. 10 are all No, the communication interval state is “normal”. Therefore, output control unit 3 ₁ notifies the transition completion as a normal response to the numerical controller 1 (A17). Moreover, since step S71 of FIG. 11 becomes No and S72 becomes Yes, an operation mode changes to abnormality notification mode.

When the transmitted numerical controller abnormality notification mode transition data from 1, since the input-output control unit 3 to ₂ is not failed, any of the sequence data communication interval monitor section 4 and the same data communication interval monitor section 5 Abnormality is not detected. Output control unit 3 ₂ performs processing of communication interval monitor section notification mode management unit 7. At this time, since steps S81, S82, and S84 in FIG. 10 are all No, the communication interval state is “normal”. Therefore, the input-output control unit 3 ₂ notifies the transition completion as a normal response to the numerical controller 1 (A19). Moreover, since step S71 of FIG. 11 becomes No and S72 becomes Yes, an operation mode changes to abnormality notification mode.

When the numerical control device 1 receives the notification of completion of the transition to the abnormality notification mode from all the input / output control devices 3 ₁ and 3 ₂ , the numerical control device 1 shifts to the normal operation mode and inputs / outputs output data to the machine tool component 2. The data is transmitted to the control devices 3 ₁ and 3 ₂ (A20, A22). The input / output control devices 3 ₁ and 3 ₂ transmit input data from the machine tool to the numerical control device 1 (A21, A23).

  With the above operation, when an error is detected by any I / O controller, the error is notified to all I / O controllers and output to machine tool components is stopped, and the cause of the error is cleared from the numerical controller. The input / output control device can be restored without erroneously detecting the abnormality.

  According to the present embodiment, in order to prevent erroneous detection of an abnormality in an environment where an abnormality may be detected again due to a communication delay when an abnormality factor clear is notified from the numerical control device to the input / output control device. The numerical control device can resume the signal output to the machine tool component by executing in advance the data for shifting to the operation mode in which the abnormality detection is not performed, in the procedure of transmitting, clearing the abnormality, and canceling the operation mode.

  As described above, the input / output control device according to the present invention is configured so that when the illegal data is detected within the shortest communication interval and when the same or normal order data cannot be transmitted / received beyond the longest communication interval, This is useful in that it can detect abnormalities.

  DESCRIPTION OF SYMBOLS 1 Numerical control apparatus, 2 Machine tool component apparatus, 3 Input / output control apparatus, 4 Sequence data communication interval monitoring part, 5 Same data communication interval monitoring part, 6 Communication interval management table, 7 Communication interval monitoring part Notification mode management part, 12 station number, 13, 18 shortest communication interval, 14, 19 longest communication interval, 15 sequence number, 17 number of check frames, 41, 51 free run counter, 42 input terminal, 52 data comparison buffer.

Claims (5)

Connected to a numerical controller that repeats outputting the same sequence number multiple times while changing the sequence number,
An input / output control device that outputs a signal input from a machine tool component to the numerical controller, and outputs a signal to the machine tool component based on data input from the numerical controller;
The same data communication interval monitoring unit for detecting an abnormality based on the reception interval of the data with the same sequence number;
A sequence data communication interval monitoring unit for detecting an abnormality based on a reception interval of data in which the sequence number is different from a set number;
With
When at least one of the same data communication interval monitoring unit and the sequence data communication interval monitoring unit detects an abnormality, the numerical control device is notified of the abnormality detection and the signal output to the machine tool constituent device is stopped. An input / output control device.   The same data communication interval monitoring unit receives data having the same sequence number at an interval shorter than the first shortest communication interval or detects an abnormality when it cannot be received during the first longest communication interval. The input / output control apparatus according to claim 1.   The sequence data communication interval monitoring unit receives data having a sequence number different by 2 or more at an interval shorter than the second shortest communication interval or detects an abnormality when it cannot be received during the second longest communication interval. The input / output control apparatus according to claim 1 or 2.   4. The input / output control apparatus according to claim 1, further comprising an input terminal that switches between valid / invalid of the same data communication interval monitoring unit and the sequence data communication interval monitoring unit. 5. The input / output control apparatus according to any one of claims 1 to 4, wherein a plurality of units are connected to the numerical control apparatus.
When an abnormality occurs in its own device or another input / output device, the same data communication interval monitoring unit and the sequence data communication interval monitoring unit are newly shifted to an operation mode in which no abnormality is detected,
When the cancellation of the abnormality is notified from the numerical control device, the same data communication interval monitoring unit and the sequence data communication interval monitoring unit are shifted to the operation mode for detecting the abnormality, and to the component device of the machine tool An input / output control device comprising a communication interval monitoring unit notification mode management unit for resuming signal output.

Images