JPH01161503A - Device for controlling positioning of machine tool - Google Patents

Abstract

PURPOSE:To synchronously control numerous controlled systems with a simple constitution by additionally providing a sub-CPU, synchronous circuit, and complete information outputting circuit. CONSTITUTION:When a move command is outputted from a main CPU 1 to a master CPU 2a, the master CPU 2a sends start information to the synchronous circuit 7 of each sub-CPU 2a-2c through a bus 6. Upon receiving the command, each synchronous circuit 7 issues a movement starting signal and caused each sub-CPU 2a-2c to start the movement of each controlled system 4 in accordance with the move command from the main CPU 1 in such a way that the start of the movement of each system 4 is synchronized. When each system 4 completes the movement in accordance with the move command of the main CPU 1, a movement complete signal is outputted from each synchronous circuit 7. The movement complete signals is sent to the complete information outputting circuit 8 of the master CPU 2a through the bus 6. The circuit 8 sends completion information to the main CPU 1 so as to synchronize the movement completion of the system 4 when the movement complete signals are received from the synchronous circuits 7.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a plurality of sub-CPUs controlled by a main CPU.
The present invention relates to a positioning control device for a machine tool that includes a PU and uses each sub-CPU to position and move a plurality of control objects.

[Conventional technology] Machine tools (drilling machine, electric discharge machine) using CPU.

When performing positioning control of a machining center, etc.), 1
There is naturally a limit to the number of control objects (number of axes) that can be controlled by one CPU.

[Problems to be Solved by the Invention] For this reason, conventionally, it has been difficult to increase the number of controlled objects one after another, and if they were to be increased, there was a problem that the configuration for synchronous control of them would become extremely complicated. Ta.

SUMMARY OF THE INVENTION An object of the present invention is to provide a positioning control device for a machine tool that can synchronously control a large number of control objects with an extremely simple configuration, and can easily add more control objects.

[Means for solving the problem] One sub-CPU among a plurality of sub-CPUs that are controlled by the main CPU and each positioning and moving a plurality of controlled objects is designated as a master CPU, and the remaining sub-CPUs are designated as a master CPU. Set as slave CPU. Each sub-CPU is equipped with a synchronization circuit, and the synchronization circuits are connected to each other by a synchronization bus.

The master CPU receives a movement command from the main CPU.
The operation of each sub-CPU (including the master CPU itself) is started via each synchronization circuit, and synchronization is established at the time of start.

When the operation of each sub CPU is completed, an operation completion signal is sent to a completion information output circuit provided in the master CPU. When all the operation completion signals are received, the completion information output circuit notifies the main CPU of this fact and synchronizes upon completion.

[Operation] When a movement command is issued from the main CPU to the master CPU, the master CPU sends start information to each sub CPU via the bus.
Send to U's synchronous circuit. As a result, each synchronization circuit issues a movement start signal, and each sub-CPU starts movement of each controlled object in response to a movement command from the main CPU, so that movement starts can be synchronized. Further, when each controlled object completes movement according to a movement command from the main CPU, a movement completion signal is output from the synchronization circuit. The movement completion signal is sent to the completion information output circuit of the mask CPU via the bus. This completion information output circuit outputs the completion information to the main CP when all the movement completion signals from each synchronous circuit are received.
This is sent to U, and this allows synchronization of movement completion.

[Embodiment] Hereinafter, the present invention will be explained in detail with reference to the drawings.8 Fig. 1 is a block diagram showing an embodiment of the positioning control device for a machine tool according to the present invention, and Fig. 2 similarly shows the main parts taken out. In these diagrams, 1 is the main CP.
It is U. This main CPU receives movement commands such as NC commands.

The command is sent to the sub CPU 2a, 2b, depending on the content.
Distribute to 2c. Here, the sub CPUs 2a to 2c are
One of them (here 2a) is the master CPU, and the remaining two (here 2b and 2c) are slave CPUs.
It is said to be U. Further, movement commands from the main CPU are distributed among the CPUs 2a to 2c via the shared memory 3, which is readable and writable, respectively.

4 is a control object (for example, a table driven by a servo motor,
drill chuck, etc.), and here three are provided for one sub-CPU.

Reference numeral 5 denotes a data bus, and reference numeral 6 denotes a synchronization bus consisting of a positioning movement start synchronization bus 6a and a positioning movement completion synchronization bus 6b.

7 is a synchronization circuit provided in each sub CPU 2a, 2b, 2c, which uses an RS flip-flop;
Each S input terminal is connected to the synchronization bus 6a.

The Q output terminal is connected to the synchronization bus 6b.

Reference numeral 8 denotes a completion information output circuit provided in the master CPU 2a, which uses a three-person gate and transfers the movement completion signal from the synchronization circuit 7 to the completion information output circuit 3 through the synchronization bus 6b.
The input terminals are connected to each input terminal in hexagonal directions.

Next, the operation of the above-mentioned apparatus of the present invention will be explained with reference to FIGS. 3 and 4. First, when a movement command is sent to the main CPUI from an NG tape reader (not shown) or the like, the main CPUI stores the contents of the command in the shared memory 3. This is received by the master CPU 2a via the data bus 5.

Master C: PU 2a generates start information and sends it to each sub CPU 2a via positioning movement start synchronization bus 6a.

2b, 2c synchronous circuit 7 (that is, all synchronous circuits 7゜7.
7). When start information is given to the S human power terminal of each synchronous cycle f17, a movement start signal is output from its Q output terminal, and the sub CPUs (master CPU 2a and slave CPUs 2b, 2c) are connected to the main CPU via the data bus 5.
It processes a movement command sent from the PUI (in this case, directly from the shared memory 3), and moves each controlled object 4 accordingly.

When the processing for the movement command, that is, the positioning movement is completed, each sub CPU 2a, 2b, 2c gives a signal to that effect to the R input terminal of its own synchronization circuit 7. As a result, a movement completion signal (in this case, an inverted signal of the movement start signal) is output from the Q output terminal of each synchronization circuit 7. Each movement completion signal is sent via a positioning movement completion synchronization bus 6b to a completion information output circuit 8 provided in the master CPU 2a.
sent to. This output circuit 8 is connected to all synchronous circuits 7゜7.
．． When the movement completion signal from 7 is input, data bus 5
The completion information is sent to the main CPUI via the shared memory 3 (in this case, to the main CPUUI via the shared memory 3), and the completion of the movement is reported.

As described above, the sub-C by the command from the main cpmt
P U 2 a e 2 b * 2 c starts positioning control at the same time, and all sub CPUs 2 a and 2 b
.

When the positioning control by 2c is completed, the main CP
U1 will receive the report, and a large number of controlled objects 4
. . . synchronous control is achieved.

[Effects of the Invention] As described above, according to the present invention, a large number of control objects can be synchronously controlled by simply adding a sub-CPU and a simple circuit 1 such as an RS flip-flop circuit or an AND gate. Additionally, adding a slave CPU and the above-mentioned simple circuit can easily handle the addition of control targets (in Figure 4, all steps except "processing for movement commands" have the same content). There are effects such as

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the device of the present invention, and FIG.
The figure is a block diagram showing the main parts, and FIG. 3 is a flowchart showing the operation of the master CPU in FIG.
FIG. 4 is a flowchart showing the operation of the slave CPU. 1...Main CPU, 2a~2cm sub CPU (
2a...' Master CPU, 2b, 2cm slave CPU
), 4... Controlled object, 5... Data bus, 6th dose period bus, 6a... Positioning movement start synchronization bus, 6b
- 11 Positioning movement completion synchronization bus, 7... Synchronization circuit (R871J block flop circuit), 8... Completion information output circuit (AND gate). Patent applicant Hitachi Seiko Co., Ltd. Agent Patent attorney Masami Akimoto (1 other person) No. 1
Meditation 6-Interperiod m8 Figure 3

Claims (1)

[Claims] 1. In a positioning control device for a machine tool that positions and moves a plurality of control objects using a plurality of sub-CPUs controlled by a main CPU, each of the sub-CPUs is provided with:
Each receives start information issued by the master CPU when a movement command is issued from the main CPU to one CPU (hereinafter referred to as master CPU) among the sub CPUs, and issues a movement start signal, and a synchronization circuit that causes each sub-CPU to start moving each controlled object in response to a movement command from the CPU, and issues a movement completion signal when each controlled object completes movement in accordance with the movement command; A positioning movement start synchronization bus that is provided to each of the synchronization circuits, and a bus that sends the movement completion signal to the master CP.
A positioning movement completion synchronization bus sent to U, and a completion signal that provides movement completion information to the main CPU when movement completion signals from all the synchronization circuits are sent to the master CPU via this positioning movement completion synchronization bus. 1. A positioning control device for a machine tool, comprising: an information output circuit.