JP2001222308A - Numerical control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an NC system capable of reducing the number of connectors or wiring necessary for connection with outside equipment, and miniaturizing an NC unit. SOLUTION: This numerical control system is provided with a control board 8 for inputting data and displaying the data, an NC unit 1 for operating numerical arithmetic operation based on the data inputted from the control board 8 and generating control data, and controllers 2, 3 and 4 for controlling a machine tool based on the control data generated by the NC unit 1. In this system, the control board 8, the NC unit 1, and the controllers 2, 3 and 4 are respectively provided with a communication interface, and those communication interfaces are serially connected through transmission paths 41, 42, 43, 44 and 45, and the same data are allowed to flow on the transmission paths so that the transmission and reception of data among the control board 8, the NC unit 1, and the controllers 2, 3 and 4 can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a numerical control (Num).
The present invention relates to an electronic control (hereinafter referred to as NC) system, and particularly to an NC which performs numerical control operation
The present invention relates to an NC system having excellent connectivity between a unit, an operation board for inputting / outputting data to / from the NC unit, and an external device such as a machine tool controlled by the NC unit.

[0002]

2. Description of the Related Art FIG. 9 is a system block diagram showing an entire configuration of a conventional NC system. In FIG. 9, reference numeral 1 denotes an NC unit for performing numerical control operation,
For example, a servo motor (not shown) and a spindle motor (not shown) attached to a machine
Servo amplifier and spindle amplifier, which are driven and controlled based on the data sent from the unit 1, are a manual pulse generation dial (not shown) and XY axis movement buttons (not shown)
An external input / output device such as a remote I / O (Remote I / O) for inputting / outputting data to / from the NC unit 1 is connected.
e Input / Output; hereinafter referred to as RIO),
Reference numeral 6 denotes a keyboard for inputting processing data and various processing commands to the NC unit 1. Reference numeral 7 denotes a display for displaying the state of the entire NC system including the NC unit 1, data input from the keyboard 6, and the like. Are connected to the RIO 5 via the connector 25 and the serial pair cable 35, to the keyboard 6 via the connector 26 and the key scan signal cable 36, and to the display 7 via the connector 27 and the display signal cable 37, respectively. . The servo amplifiers 2 and 3 and the spindle amplifier 4
Are daisy-chain connected to the NC unit 1 via the connector 24 and a serial pair cable 32, a serial pair cable 33 and a serial pair cable 34.

FIG. 10 shows a detailed internal configuration diagram of this conventional NC unit 1. As shown in FIG. In the figure, reference numeral 10 denotes a CPU for performing a numerical operation, and 11 denotes a data bus connected to the CPU 10. Via this data bus 11, a ROM (Read O / O) incorporating control software for the NC system is provided.
nly Memory) 12 and a random access memory (RAM) serving as a work area for the CPU 10.
ory) 13, servo amplifiers 2, 3 and spindle amplifier 4
A servo communication interface 14 for controlling data communication with the RIO 5, a RIO interface 15 for controlling data communication with the RIO 5, a keyboard controller 16 for controlling data input / output with the keyboard 6, and a data input / output with the display 7. The display controller 17 that performs
It is connected to U10. As described above, the connectors 24, 25, 26, and 27 for connecting to the communication cables are connected to the servo communication interface 14, the RIO interface 15, the keyboard controller 16, and the display controller 17, respectively.

[0004] The operation of the conventional NC system will be described below. When processing data or a processing command is input to the NC unit 1 from the keyboard 6 via the key scan signal cable 36 and the keyboard controller 16,
The CPU 10 of the NC unit 1 arithmetically processes these data and commands, generates control data necessary for performing predetermined processing, and generates
The signals are transmitted to the servo amplifiers 2 and 3 and the spindle amplifier 4 via the connector 24, the serial pair cable 32, the serial pair cable 33 and the serial pair cable 34. On the other hand, in the servo amplifiers 2 and 3 and the spindle amplifier 4 connected in a daisy chain, the servo motor and the spindle motor are driven and controlled based on the control data to perform machining. During this time, the data inputted from the keyboard 6 and the state of the machine tool collected from the servo amplifiers 2 and 3 and the spindle amplifier 4 are displayed on the display 7 via the display controller 17, the connector 27 and the display signal cable 37. Is transmitted and displayed, and input data and the state of the NC system are confirmed. Further, various external input / output devices connected to the RIO 5 may be connected to the RIO 5 and R
Data is input / output to / from the CPU 10 via the IO interface 15. In each of the above operations,
While using the RAM 13 as a work area, the CPU 10 performs processing of processing data and processing instructions in accordance with control software stored in the ROM 12, and
The input / output of these data to / from each interface via the data bus 11 is controlled.

[0005]

However, in the conventional NC system shown in FIGS. 9 and 10, the NC unit 1 is set as a master for communication between the devices, and the servo amplifiers 2, 3 and the spindle amplifier are set. 4, RIO5,
Since external devices such as the keyboard 6 and the display 7 are connected in parallel to the NC unit 1 (star-shaped centering on the NC unit 1), connectors and communication cables required for connection between the NC unit 1 and the external device are provided. The number of devices increases in proportion to the number of devices to be connected, so that there is a problem that a space is required for mounting a connector and that wiring of a communication cable becomes complicated. In particular, in recent years, it has been difficult to secure a space for mounting a connector due to the miniaturization of the NC unit 1, and reducing the number of connectors and the number of cable wirings has become an important issue.

Further, since all the external devices are connected to each other via the NC unit 1 and are configured to perform communication using only the NC unit 1 as a master, the external devices operate only as slaves. If the power of the NC unit 1 cannot be turned on for maintenance, etc., the keyboard 6
Therefore, there is a problem that the parameters of the servo amplifiers 2 and 3 cannot be set, confirmed or changed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional apparatus, and a first object of the present invention is to reduce the number of connectors and cable wires required for connection with an external device. It is an object of the present invention to provide an NC system that can reduce the size of the NC unit and reduce the size of the NC unit and simplify the cable wiring.

A second object of the present invention is to provide an NC system capable of setting, checking, or changing parameters for the servo amplifiers 2, 3 and the like from the keyboard 6 even when the power supply of the NC unit is OFF. The purpose is to gain.

[0009]

To achieve the above object, an NC system according to the present invention comprises a data input device for inputting data, and a display device for displaying data input by the data input device. A numerical unit comprising: an NC unit that performs numerical operation based on data input by the data input device to generate control data; and a control device that controls a machine tool based on the control data generated by the NC unit. In the control system,
By providing a communication interface to each of the data input device, the display device, the NC unit, and the control device, connecting these communication interfaces in series by a transmission line, and flowing the same data on the transmission line, The data input device, the display device, the NC unit, and the control device are configured to transmit and receive data.

[0010] An NC system according to the present invention comprises an operation board provided with a data input device for inputting data, a display device for displaying data input by the data input device, and a data input device. N that performs numerical operation based on
A numerical control system comprising a C unit and a control device for controlling a machine tool based on control data generated by the NC unit;
A communication interface is provided for each of the C unit and the control device, and these communication interfaces are connected in series by a transmission line, and the same data is flowed on the transmission line, whereby the operation board, the NC unit and the control unit are controlled. It is configured to transmit and receive data between devices.

Further, the NC system according to the present invention has at least one device other than the NC unit provided with a synchronizing signal output means for outputting synchronizing data for synchronizing communication between devices on the transmission path. It is a thing.

Further, in the NC system according to the present invention, the operation board includes synchronization signal output means for outputting synchronization data for synchronizing communication between devices on the transmission path.

Further, the NC system according to the present invention includes, on the NC unit and the operation board, synchronization signal output means for outputting synchronization data for synchronizing communication between devices on the transmission path, The operation board includes a timer for measuring an elapsed time, and when the operation signal is not output from the synchronization signal output means of the NC unit within a predetermined time after the operation board is started, the synchronization signal output means of the operation board Is configured to output synchronous data from the.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing an entire configuration of an NC system according to a first embodiment of the present invention. In the drawing, reference numeral 1 denotes an NC unit for performing numerical control operation, and 2, 3, and 4, for example, A servo amplifier and a spindle amplifier for driving and controlling a servo motor (not shown) and a spindle motor (not shown) attached to the machine tool based on data sent from the NC unit 1, and an external input / output device 5. Connected
A remote I / O (RIO) 8 for inputting / outputting data between the external input / output device and the NC unit 1, a keyboard (KB) 6 for inputting processing data and various processing commands to the NC unit 1, and an NC unit 1 is an operation board provided with a display 7 for displaying the state of the entire NC system including the data No. 1 and data input from the keyboard 6 and the like.

The NC unit 1 incorporates a CPU 10 for performing numerical calculations of machining data and machining commands, a data bus 11 connected to the CPU 10, and control software for the NC system. The NC unit 1 is connected to the CPU 10 via the data bus 11. ROM (Read Only Memory) 1
2. Connected to the CPU 10 via the data bus 11,
RAM (Random) which is the work area of PU10
Access Memory 13
As a characteristic component of the first embodiment, a high-speed HDLC communication interface 9 for performing serial communication with an external device is provided.

Each of the servo amplifiers 2 and 3, the spindle amplifier 4, the RIO 5, and the operation board 8 also has the high-speed HD.
A serial communication interface (not shown) corresponding to the LC communication interface is provided. Thus, one of the high-speed HDLC communication interfaces 9 is connected to the CPU 10 via the data bus 11 and the other is a single high-speed HDLC communication interface. High-speed serial communication pair cables 41, 42, 43, 44, 4
5, the servo amplifiers 2, 3, the spindle amplifier 4, the RIO 5, and the operation board 8 are connected in series to the NC unit 1 in a daisy chain format, respectively, so that the NC unit 1, the servo amplifiers 2, 3, the spindle The same data is transmitted and received between the amplifier 4, the RIO 5, and the operation board 8.

FIG. 2 is a block diagram showing a detailed configuration of the operation board 8 according to the first embodiment. As described above, in the first embodiment, the keyboard 6 for inputting processing data and various processing commands to the NC unit 1, the keyboard controller 16 for controlling the keyboard 6,
A display 7 for displaying the state of the entire NC system, data input from the keyboard 6, and the like, and a display controller 17 for controlling the display 7 are housed in the operation board 8. The keyboard 6 and the display 7 are
High-speed H as serial communication interface
It is connected in series to the high-speed HDLC communication interfaces of the servo amplifiers 2 and 3 and the RIO 5 and the NC unit 1 via the display HDLC communication interface 18 and the keyboard HDLC communication interface 19 which are DLC communication interfaces. And the display 7 can communicate with each device such as the servo amplifiers 2 and 3 without passing through the NC unit 1. Even when the power of the NC unit 1 is turned off, the operation board 8 communicates with each external device. By operating as a master, the operation board 8 and each device can transmit and receive data to and from each other.

In the first embodiment, the manual pulse generation dial 20, a pulse dial controller 21 for controlling the manual pulse generation dial 20, and X
A Y-axis movement button 22 and a movement button controller 23 for controlling the XY-axis movement button 22 are also housed in the operation board 8, and the servo amplifiers 2, 3, RIO 5, N
It is configured so that data can be input and output to and from the C unit 1. Note that the keyboard controller 16,
The pulse dial controller 21, the moving button controller 23, and the HDLC communication interface 19 for the keyboard are generally connected
A machine input / output interface controller 24 for performing high-speed HDLC communication with the C unit 1 and the like is configured.

FIG. 3 shows a high-speed serial communication pair cable 41, 42, 43, 44,
Reference numeral 45 indicates a configuration example of data transmitted and received between the NC unit 1 and external devices such as the servo amplifiers 2 and 3 and the operation board 8. As shown in the figure, the high-speed serial communication pair cables 41, 42, 43, 44, 45
It has two transmission paths, a direction input to the C unit 1 (hereinafter referred to as an up direction) and a direction output from the NC unit 1 to an external device (hereinafter referred to as a down direction). Different data is sent on the transmission path. The high-speed serial communication pair cables 41, 42, 4
The basic cycle of communication using 3, 44 and 45 is 111 μs
Communication is performed by alternately repeating two types of transfer patterns having different data structures in the basic period in both the up direction and the down direction.

First, there are the following two types of data structures of the basic period in the down direction. That is, in the first pattern, first, the synchronization data 70 is transmitted from the NC unit 1 to each device in order to synchronize the communication of each device connected to the NC system. A reference point of the basic cycle is determined. When each device is synchronized with the synchronization data 70 in this manner, the data 71 is transmitted from the NC unit 1 to the servo amplifiers 2 and 3 and the spindle amplifier 4 in the basic period of 1 μs to 35 μs.
μs during the period, followed by NC unit 1
Data 72 to IO5 is 35 μs to 69 μs.
The data 73 is 69μ from the NC unit 1 to the operation board 8.
It is transmitted in a period of s to 111 μs.

The second pattern is as follows. First, after the synchronization data 74 (1 μs) is transmitted from the NC unit 1,
From the NC unit 1 to the servo amplifiers 2 and 3 (spindle amplifier 4
) To the RIO 50 from the NC unit 1 (35 μs).
s to 69 μs) further includes data 77 (6 to 6) from the servo amplifiers 2 and 3 (including the spindle amplifier 4) to the operation board 8.
9 μs to 111 μs). As described above, these two data configuration patterns are generated alternately, and a data pattern indicating the idle state is output from the NC unit 1 in the idle state.

On the other hand, the data structure of the basic cycle in the upward direction is of the following two types. That is, in the first pattern, first, a standby time (1 μs) for synchronous data is secured.
Here, when the NC unit 1 is operating, the synchronization data 70 is transmitted from the NC unit 1 to each device during the standby time, so that each device is synchronized. When the NC unit 1 is not operating and the synchronization data 70 is not output, the operation board 8 becomes a communication master to synchronize the communication of each device connected to the NC system, and this uplink is used. The synchronous data 80 is transmitted to the transmission path. The details of the operation will be described later. When each device is synchronized by the synchronization data 70 or 80 in this way, next, the servo amplifiers 2 and 3 and the spindle amplifier 4 transmit data 8 to the NC unit 1.
1 is transmitted in the period of 1 μs to 35 μs of the basic cycle, and subsequently, 35 data 82 are sent from the RIO 5 to the NC unit 1.
The data 83 is transmitted from the operation board 8 to the NC unit 1 in the period of 69 μs to 111 μs.

The second pattern is the synchronous data 84
Then, the servo amplifiers 2 and 3 and the spindle amplifier 4
The data 85 to the C unit 1 is 1 μs to 35 μs, and the data 86 from the RIO 5 to the NC unit 1 is 35 μs.
s to 69 μs, and data 87 from the operation board 8 to the servo amplifiers 2 and 3 (including the spindle amplifier 4)
It is sent in a period of μs to 111 μs. As in the case of the downward direction, these two data configuration patterns are generated alternately, and when these data are not transmitted during the basic cycle, a data pattern indicating an idle state is output from the operation board 8. You.

Note that the NC unit 1 and the servo amplifier 2
3 and data 71 and 7 transmitted and received between the spindle amplifier 4
Specific examples of 5, 81, 85 include control information such as coordinates of a tool or a work, a target moving speed, status information such as an alarm, and parameters of the servo amplifiers 2 and 3 and the spindle amplifier 4. The data 72, 73, 76, 82, 83, and 86 transmitted and received between the NC unit 1 and the operation board 8 and the RIO 5 include:
There is mechanical contact information and the like. Further, status information such as parameters and alarms of the servo amplifiers 2 and 3 and the spindle amplifier 4 is transmitted and received between the operation board 8 and the servo amplifiers 2 and 3 and the spindle amplifier 4 by data 77 and 87.

Further, an NC unit 1, a servo amplifier 2,
3. Transmission and reception of data between the spindle amplifier 4, the RIO 5, and the operation board 8 basically use communication according to the HDLC procedure.
When a display command such as "display the currently executed machining program" is sent to the NC unit 1 via the DLC communication interface 19 in the packet 83, the data (machining program) corresponding to this request is sent by the packet 73 to the NC unit 1 in fixed bytes. 1 is sent to the operation board 8 and displayed on the display 7 via the HDLC communication interface 18 for the display. For example, when a command requesting parameters and the like is sent from the operation board 8 to the servo amplifiers 2 and 3 and the spindle amplifier 4 in a packet 87, data 77 satisfying the request is transmitted to the servo amplifiers 2 and 3.
And output from the spindle amplifier 4 to the operation board 8.

FIG. 4 shows data (71, 72,...) Other than synchronous data transmitted and received between the NC unit 1 and each external device.
73, 75, 76, 77, 81, 82, 83, 85, 8
6, 87). As shown in the figure, each data is composed of a start flag 91, a station address 92, transmission data 93, a CRC (Cyclic Redundancy Check) 94, and an end flag 95 in this order. The high-speed HDLC communication interface reads the station address 92, and if it matches with itself, determines that it is the data addressed to itself and continues the transmission data 9
3. When the CRC 94 and the end flag 95 are received and they do not match, it is determined that the message is not addressed to itself, and the process waits until the next start flag 91 is received. For example, if the station address of the servo amplifier 2 is FF00 and the station address 92 in the data is FF00, the servo amplifier 2 receives the data 93 to 95 subsequent to the station address 92, loads the data 93 to 95 into the memory, and sets the station address 92 to FF00. If not, it waits for the next start flag 91. A unique station address is set in advance for each device.

The operation of the first embodiment will be described below with reference to FIGS. 3, 4, and 5. In addition,
FIG. 5 is a flowchart showing the operation flow of the NC unit 1, the operation board 8, the servo amplifiers 2, 3 (including the spindle amplifier 4), and the RIO 5, and the first pattern of the data configuration shown in FIG. The second and third patterns are different in only the data content to be transmitted and received, and have the same operation. Therefore, the following description focuses on the operation during the first basic period (111 μs).

First, the operation of the NC unit 1 will be described. In step S101, when the power supply of the NC unit 1 is turned on, steps S102 and S
At 103, the timer for counting the basic period built in the high-speed HDLC communication interface 9 is turned on and reset, and at step S104, the high-speed H of the NC unit 1 is turned on.
Synchronous data 70 is generated and output from the DLC communication interface 9 to the operation board 8, the servo amplifiers 2, 3, the spindle amplifier 4, and the RIO 5. Thus, the synchronization data 70 is output within 1 μs after resetting the timer,
NC unit 1, servo amplifiers 2, 3, spindle amplifier 4,
When the RIO 5 and the operation board 8 are synchronized, the elapsed time is monitored by a timer built in each device in step S105, and after 1 μs, the process proceeds to step S106, where the NC unit 1 and the servo amplifiers 2, 3 (the spindle amplifier 4) are operated. ), And data 71 and 81 (in the case of the first pattern) or 75 and 85 (in the case of the second pattern).

Next, when the data transmission / reception between the NC unit 1 and the servo amplifiers 2 and 3 is completed within 1 μs to 35 μs, the elapsed time is monitored in step S107, and
After 5 μs, the process proceeds to step S108, where 35 μs to 6
Data 72 between NC unit 1 and RIO5 in 9 μs,
82 or 76, 86 are transmitted and received. Similarly, when the elapsed time is monitored in step S109 and 69 μs has elapsed, in step S110, the data 73 and 83 are transmitted and received between the NC unit 1 and the operation board 8, and in step S1
At 11, the elapsed time of the timer is 111 μs, which is the basic cycle.
At the point when step S
By returning to 103, the process moves to the next basic cycle, and thereafter, the operation of this basic cycle is repeated. The data 73, 8 between the NC unit 1 and the operation board 8
The transmission / reception of No. 3 is performed only once every two basic periods as shown in FIG.

Next, the operation of the operation board 8 will be described. When the power is turned on in step S201, the operation board 8 performs steps S202 and S20.
In step 3, the timer built in each high-speed HDLC communication interface is turned on and reset, and step S
At 204, the elapsed time of the timer is measured. If the elapsed time is 1 μs or less, the process shifts to step S205, and waits for reception of the synchronization data 70 from the NC unit 1. When the synchronization data 70 is received on the downlink transmission path, shifts to step S206. Then, each timer is reset by the synchronization data 70 output from the NC unit 1, and the NC unit 1 and the operation board 8 are synchronized. Also, in step S205, the synchronization data 70
Is not received, the process returns to step S204, and by repeating steps S204 and S205, it is monitored whether or not the synchronization data 70 is output from the NC unit 1 until the elapsed time reaches 1 μs.

Here, for example, when the synchronization data 70 is not output from the NC unit 1 such as when the power of the NC unit 1 is in the OFF state, the determination result of step 205 is always "N". , Elapsed time 1μ
s, the result of the determination in step S204 is “Y”
Then, the process proceeds to step S207. In this case, N
Since the synchronization data 70 is not output from the C unit 1, it is necessary to synchronize the communication with the operation board 8 acting as a master. In step S207, the operation board 8 executes, for example, the timer of the HDLC communication interface 19 for the keyboard. Is reset and step S
Synchronization data 8 for synchronizing each device at 208
0 is output from the keyboard HDLC communication interface 19 to the upstream transmission path.

As described above, when the NC unit 1 is operating, the timer of the NC unit 1 is synchronized with the timer of the operation board 8 in step S206, and when the NC unit 1 is not operating, in step 208 When the operation board 8 outputs the synchronization data 80, the timer of the operation board 8 reset in step S207 and the timer of each device are synchronized. That is, when the communication function of the NC unit 1 is operating, it is output from the synchronization data 70 of the NC unit 1, and when the communication function of the NC unit 1 is not operating, it is output from the operation board 8. All devices are synchronized based on the synchronization data 80.

The above step S206 or step S2
In step 08, when the NC unit 1 and the operation board 8 are synchronized, in step S209, the elapsed time of the timer is measured based on the reference time. 1 and the operation board 8, data 73 and 83 (in the case of the first pattern), and between the operation board 8 and the servo amplifiers 2 and 3 and the spindle amplifier 4, data 77 and 87 (in the case of the second pattern) Is transmitted and received. When the transmission and reception of the data are completed, the completion of the basic cycle is monitored in step S211.
By returning to 03, a new basic cycle is started.

Next, the servo amplifiers 2 and 3 and the spindle amplifier 4
And the operation of RIO5 will be described. Step S3
01, when the power is turned on, the servo amplifier 2,
3. The spindle amplifier 4 and the RIO 5 execute Step S302
, The built-in timer is turned on.
Then, in step S303, the reception of the synchronization data is monitored on both the upstream and downstream transmission paths, and when the NC unit 1 is operating, the synchronization data 70 (downstream transmission path) from the NC unit 1 is transmitted. If the NC unit 1 is not operating, the process proceeds to step S304 when the synchronization data 80 (upstream transmission path) output from the operation board 8 is received. The NC unit 1 and the operation board 8 are reset by resetting the timer in the communication interface.
Operation is synchronized.

In step S305, the elapsed time is monitored by a timer. When 1 μs elapses, the process proceeds to step S306, and data 71, 81, and 7 are transmitted between the servo amplifiers 2 and 3 and the NC unit 1 during 1 μs to 35 μs.
5, 85 are transmitted and received. Next, when 35 μs has elapsed in step S307, the process proceeds to step S308, and the RIO5 and the NC unit 1 are moved between 35 μs and 69 μs.
The data 72, 82, 76, and 86 are transmitted and received between them, and when the elapsed time reaches 69 μs in step S309, the process proceeds to step S310, where the data 77 and 87 are transmitted and received between the servo amplifiers 2 and 3 and the operation board 8. . When the timers built in the servo amplifiers 2 and 3 and the RIO 5 count up to the basic period of 111 μs, the synchronous data is received in step S303, and step S304 is performed.
Holds that value until reset by. The transmission and reception of the data 77 and 87 are performed only in the second pattern as shown in FIG.

FIGS. 6 and 7 are a flowchart showing the operation of the first embodiment when the communication function of the NC unit 1 is stopped, and the structure of data transmitted and received, respectively. In the figure, the broken line indicates that such an operation or data transmission / reception is not performed. When the communication function of the NC unit 1 is stopped as shown in FIG. 6, since the synchronization data 70 is not output from the NC data 1, the operation board 8 detects the OFF state of the NC unit 1 in step S204. S207
Then, the process proceeds to step S208 to output the synchronization data 80 to each device, thereby functioning as a master instead of the NC unit 1.

As shown in FIG. 7, the NC unit 1
If the communication function is stopped, the downlink data 70
No. to 76 are not output from the NC unit 1 to each device, and only the data 77 output from the servo amplifiers 2 and 3 to the operation board 8 is transmitted using the downstream transmission path.

As described above, according to the first embodiment, the NC unit 1, the servo amplifiers 2, 3, the spindle amplifier 4, the RIO
5 and operation board 8 are provided with serial communication interfaces, and these serial communication interfaces are connected to high-speed serial communication pair cables 41, 42, 4
Since data is transmitted and received between the devices by connecting them in series in a daisy-chain manner by means of 3, 44, and 45, the data transmission path with the peripheral device can be integrated into a single communication line. The number of wirings and the number of connectors connected to the unit 1 can be reduced, so that the NC unit 1 can be reduced in size and wiring can be reduced.

Further, the NC unit 1, the servo amplifier 2,
3. When data transmitted / received between the spindle amplifier 4, the RIO 5, the keyboard 6, and the display 7 is within the basic period of the data transmitted by the high-speed serial communication pair cables 41, 42, 43, 44, 45. Since it is configured to be divided and included, there is an effect that data can be transmitted and received between a plurality of devices by one transmission path.

Further, the NC unit 1, the servo amplifier 2,
3. Connect the spindle amplifier 4, the RIO 5, and the operation board 8 to the high-speed serial communication pair cables 41, 42, 43, 44,
45, a serial connection is made in a daisy chain format, and a stop of the communication function of the NC unit 1 is detected in the operation board 8, and at the time of this stop, the synchronization data 80 is output, and communication of each device constituting the NC system is performed. The operation board 8 can function as a master of the communication operation because the keyboard HDLC communication interface 19 (synchronization signal output means) configured to synchronize the
Even when the NC unit 1 is stopped, there is an effect that data can be transmitted and received between the operation board 8 and the servo amplifiers 2 and 3, the spindle amplifier 4, and the RIO 5.

Further, since the keyboard 6 for inputting data and the display 7 for displaying data are housed in the operation board 8, even if the power supply of the NC unit 1 cannot be turned on for maintenance or the like, the servo from the operation board 8 can be used. Amplifier 2, 3
And the like, and display of various state data of the servo amplifiers 2, 3 and the like can be achieved.

The NC unit 1 and the operation board 8
And a synchronizing signal output means.
A timer that measures the elapsed time, and outputs the synchronization data from the synchronization signal output means of the operation board 8 when the NC unit 1 does not output the synchronization data within a predetermined time after the operation board 8 is activated. Thus, when the NC unit 1 is not operating, the operation board 8 can automatically operate as a communication master, and there is an effect that the communication function of the operation board 8 can be easily started.

In the first embodiment, an example has been described in which the HDLC communication interface for keyboard 19 of the operation board 8 outputs the synchronization data 80.
The display HDLC communication interface 18 may be provided with an output function of synchronization data 80 (synchronization signal output means). Further, the manual pulse generation dial 20 and the XY axis movement button 22 are provided with independent HDLC communication interfaces, respectively. It may be configured to connect directly to another high-speed HDLC communication interface in series without using the HDLC communication interface 19 for use. Further, the display controller 17 is connected to an HDLC for a keyboard.
It is also possible to connect to the communication interface 19 and use the machine input / output interface controller 24 as an integrated HDLC communication interface of the operation board 8.

In the first embodiment, both the NC unit 1 and the operation board 8 are configured to output synchronous data, and when the communication function of the NC unit 1 is stopped, the operation board 8 outputs the synchronous data. Has been described so as to operate the master function of communication, but a synchronization signal output means may be provided only on the operation board 8 so as to synchronize communication only by the operation board 8.

In addition, other than the operation board 8, for example, RI
A device such as O5 may be provided with a synchronizing signal output means. Also in this case, when the communication function of the NC unit 1 is stopped, this device becomes a master of the communication operation so that data can be transmitted and received between the devices. Become. Further, a synchronization signal output means is provided for a plurality of devices, and according to a preset priority,
Each device may sequentially determine the suitability of the output of the synchronization data, and the device with the highest priority among the operating devices may output the synchronization data.

Further, in the first embodiment, the example in which the keyboard 6 and the display 7 are stored in the operation board 8 has been described, but the keyboard 6 and the display 7 and the controllers 16 and 17 corresponding thereto and the HDLC communication are provided. The interfaces 19 and 18 may be separately connected to the NC unit 1 and the servo amplifiers 2 and 3 in a daisy-chain manner.

Embodiment 2 FIG. 8 is a flowchart showing the operation of the NC system according to the second embodiment of the present invention. In the figure, step S1 of the NC unit 1
Steps S21 to S131 are described in FIG.
Are exactly the same as the steps S101 to S111, and the description is omitted. Also, the operation board 8,
Step S228 of servo amplifiers 2, 3 and RIO5
Subsequent and step S328 and subsequent steps are the same as step S209 and subsequent steps and step S305 and subsequent steps in FIG. 5, respectively, and description thereof will be omitted.

In the second embodiment, when the power of the operation board 8 is turned on in step S221, the timer in the operation board 8 is turned on and reset in steps S222 and S223, and the down direction from the NC unit 1 is set. Without waiting for the reception of the synchronization data 70, the process proceeds to step S224 to generate uplink synchronization data 80 and output it to each device in the NC system. Thereafter, in step S225, reception of the downlink synchronization data 70 from the NC unit 1 is monitored, and in step S2
If the synchronization data 70 is not received from the NC unit 1 in step S25, the process proceeds to step S226, and the reception confirmation of the synchronization data 70 in step S225 is repeated until the timer has elapsed by 1 μs. If the synchronization data 70 is not received even after the timer has elapsed for 1 μs, it is determined that the NC unit 1 is not operating, the timer in the operation board 8 is set as the reference time, and the data communication after step S228 is performed. Perform

On the other hand, in step S225, 1 μs
If the synchronization data 70 is received within this time, the NC unit 1 is in the operating state, and the process proceeds to step S227, and the timer is reset by the synchronization data 70 so that the timer of the operation board 8 is set to the timer of the NC unit 1. And after step S228,
Data communication between the devices is performed based on the timer of the NC unit 1.

The servo amplifiers 2 and 3 and the spindle amplifier 4
When the power is turned on in step S321, the timers are turned on in step S322, and the RIO 5 is in a standby state for receiving the downlink synchronization data 70 from the NC unit 1 in step S323. Then, step S323
If the synchronization data 70 is not received in step S324, the servo amplifiers 2, 3
It is determined whether or not the upstream synchronization data 80 has been received. If neither of the synchronization data 70 and 80 has been received, the process returns to step S323. Step S324
In step S325, when the reception of the uplink synchronization data 80 is confirmed, it means that the operation board 8 is operating, and by resetting the timer with the synchronization data 80 in step S325, each device is temporarily stopped. Is synchronized with the timer of the operation board 8.

On the other hand, depending on the configuration of the NC system, there is a possibility that after receiving the upstream synchronization data 80 in step S324, the downstream synchronization data 70 from the NC unit 1 may be received. In step S325, the timer of each device is temporarily set to the operation board 8
Even after the synchronization with the timer, the process returns to step S323 for 1 μs while monitoring the elapsed time in step S326, and the reception of the downlink synchronization data 70 is monitored. And
During this time, if the downlink synchronization data 70 is not received,
It is determined that the NC unit 1 is not operating, and the process proceeds from step S326 to step S328.
Data communication is performed based on the uplink synchronization data 80 from the operation board 8. In the repetitive operation of steps S323 to S326, step S
After the timer is synchronized in 325, the operation of step S325 is bypassed so that the timer is not reset again.

During this 1 μs, step S32
If the downlink synchronization data 70 is received from the NC unit 1 in step 3, the NC unit 1 is in the operating state, and the process proceeds from step S323 to step S327, and the timer once synchronized with the operation board 8 Is reset by the synchronization data 70, the timers of the servo amplifiers 2, 3 and the like are synchronized with the timers of the NC unit 1, and the reference time is used in the processing after step S328.

As described above, the servo amplifier 2,
3. Since the spindle amplifier 4 and the timer incorporated in the RIO 5 do not function as a master, they are reset when the synchronization data 70 or 80 is received, count up with the passage of time, hold the value when the time reaches 111 μs, and again. , Is held until reset by the synchronization data 70 or 80.

As described above, the operation can be performed in the same manner as in the first embodiment by the operation procedure as in the second embodiment. In addition, various control procedures having exactly the same effects can be achieved. Can be adopted.

[0055]

Since the present invention is configured as described above, it has the following effects.

A data input device for inputting data, a display device for displaying the data input by the data input device, and an NC for performing a numerical operation based on the data input by the data input device to generate control data
A numerical control system comprising a unit and a control device for controlling a machine tool based on control data generated by the NC unit, wherein each of the data input device, the display device, the NC unit and the control device A communication interface is provided, and these communication interfaces are connected in series by a transmission line, and the same data is flowed on the transmission line, so that data can be transmitted between the data input device, the display device, the NC unit, and the control device. , The number of wires connected to the NC unit can be reduced, so that the NC unit can be reduced in size and communication wires between devices can be easily connected.

Also, an operation board provided with a data input device for inputting data and a display device for displaying data input by the data input device, and a control for performing a numerical operation based on the data input by the operation board In a numerical control system including an NC unit that generates data and a control device that controls a machine tool based on control data generated by the NC unit, the numerical control system includes: an operation board, the NC unit, and the control device. By providing a communication interface, these communication interfaces are connected in series by a transmission line, and by flowing the same data on the transmission line,
Since data is transmitted and received between the operation board, the NC unit and the control device, the N
The number of wirings connected to the C unit can be reduced, and there is an effect that downsizing of the NC unit and connection of communication wiring between the devices are facilitated.

In the NC system according to the present invention, at least one device other than the NC unit includes synchronization signal output means for outputting synchronization data for synchronizing communication between devices on the transmission path. The NC
Even when the communication function of the unit is stopped, another device can function as a master of the communication operation, and there is an effect that data can be transmitted and received between the data input device, the display device, or the control device.

In the NC system according to the present invention, the operation board includes synchronization signal output means for outputting synchronization data for synchronizing communication between devices on the transmission path. Even when the communication function is stopped, the operation board can function as a master of the communication operation, data can be transmitted and received between the operation board and the control device, and the operation board can be operated even when the NC unit is not operating. Thus, it is possible to set parameters for the control device and display various state data.

Further, the NC system according to the present invention includes a synchronization signal output means for outputting, to the NC unit and the operation board, synchronization data for synchronizing communication between the devices on the transmission path, The operation board includes a timer for measuring an elapsed time, and when the operation signal is not output from the synchronization signal output means of the NC unit within a predetermined time after the operation board is started, the synchronization signal output means of the operation board Since the configuration is such that the synchronization data is output from the control unit, the operation board automatically functions as a master of the communication operation when the NC unit is not operating, so that the operation board can be easily started.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a system configuration of an NC system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an internal configuration of the operation board according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of data transmitted and received on a transmission path of the NC system according to the first embodiment of the present invention;

FIG. 4 is a data configuration diagram of the NC system according to the first embodiment of the present invention;

FIG. 5 is a flowchart showing the operation of the NC system according to the first embodiment of the present invention.

FIG. 6 is a flowchart showing an operation of the NC system according to the first embodiment of the present invention when the NC unit is not operating;

FIG. 7 is a configuration diagram of data transmitted and received on a transmission path when the NC unit is not operating in the NC system according to the first embodiment of the present invention;

FIG. 8 is a flowchart showing the operation of the NC system according to the second embodiment of the present invention.

FIG. 9 is a block diagram showing a system configuration of a conventional NC system.

FIG. 10 is a block diagram showing an internal configuration of a conventional NC unit.

[Explanation of symbols]

Reference Signs List 1 NC unit 2 Servo amplifier (control device) 3 Servo amplifier (control device) 4 Spindle amplifier (control device) 5 RIO 6 Keyboard (data input device) 7 Display (display device) 8 Operation board 9 High-speed HDLC communication interface (communication) Interface, synchronization signal output means) 10 CPU 11 data bus 12 ROM 13 RAM 16 keyboard controller 17 display controller 18 HDLC communication interface for display (communication interface) 19 HDLC communication interface for keyboard (communication interface, synchronization signal output means) 20 manual Pulse generation dial 21 Pulse dial controller 22 XY axis move button 23 Move button controller 24 Machine input / output interface controller 29 Connect 41, 42, 43, 44, 45 High-speed serial communication pair cable (transmission line) 70, 74 Synchronous data 71, 75 Synchronous data output from NC unit Data (control data) transmitted from NC unit to servo amplifier 72, 76 NC unit 73 Data transmitted from the NC unit to the operation board 77 Data transmitted from the NC unit to the operation board 80, 84 Synchronous data output from the operation board 81, 85 Transmitted from the servo amplifier to the NC unit 82, 86 Data transmitted from RIO to NC unit 83 Data transmitted from operation board to NC unit 87 Data transmitted from operation board to servo amplifier

Claims (5)

[Claims] 1. A data input device for inputting data, a display device for displaying data input by the data input device, and a control device for performing a numerical operation based on the data input by the data input device to generate control data N
A numerical control system comprising a C unit and a control device for controlling a machine tool based on control data generated by the NC unit, wherein each of the data input device, the display device, the NC unit and the control device In addition to providing a communication interface, these communication interfaces are connected in series by a transmission line, and by flowing the same data on the transmission line, the data input device, the display device, the NC unit and the control device A numerical control system configured to transmit and receive data. 2. An operation board having a data input device for inputting data, a display device for displaying data input by the data input device, and performing a numerical operation on the basis of the data input by the operation board. In a numerical control system including an NC unit that generates data and a control device that controls a machine tool based on control data generated by the NC unit, the numerical control system includes: an operation board, the NC unit, and the control device. A communication interface is provided, and these communication interfaces are connected in series by a transmission line, and the same data is flowed on the transmission line to transmit and receive data between the operation board, the NC unit, and the control device. A numerical control system characterized by comprising. 3. The apparatus according to claim 1, wherein at least one device other than the NC unit includes a synchronization signal output unit for outputting synchronization data for synchronizing communication between the devices on the transmission path. The numerical control system according to claim 1 or 2. 4. The numerical control according to claim 2, wherein the operation board includes a synchronization signal output unit that outputs synchronization data for synchronizing communication between the devices on the transmission path. system. 5. The control unit according to claim 1, wherein the NC unit and the operation board include synchronization signal output means for outputting synchronization data for synchronizing communication between the devices on the transmission line, and measure an elapsed time on the operation board. A timer for outputting synchronization data from the synchronization signal output means of the operation board when no synchronization data is output from the synchronization signal output means of the NC unit within a predetermined time after the operation board is activated. 5. The method according to claim 4, wherein
Numerical control system according to 1.