JPS6285303A - Numerical control system - Google Patents

Abstract

PURPOSE:To easily execute the wiring between a program controller PC of an independent installation type and an NC device by coupling the PC and the NC device by a serial transmission line. CONSTITUTION:A PC 2 is formed by a memory for storing a sequence program, and a microprocessor for a control, etc. To a control part of this PC 2, an NC 1 and each remote input/output part 3 are connected in an equal relation by a serial transmission line 4. That is, on the serial transmission line 4 to which plural pieces of input/output parts 3 have been connected one after another, the NC 1 is provided in the same level as the input/output part 3, when viewed from the control part of the PC 2. In this way, to the PC 2 which has been installed independently, the NC 1 and the input/output part 3 can be connected by one piece of cable. Accordingly, the wiring of the PC of an independent installation type, and the NC device can easily be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a numerical control system for controlling machines such as machine tools using a numerical control JI (NC) device and a programmable controller (PC).

(Prior art) Many of the recent NC devices have a built-in PC function that performs sequence control on the machine side, but some machine manufacturers and machine users In order to unify equipment and facilitate system expansion, a method has been adopted in which an independent PC is installed to perform sequence control of the machines.

Conventionally, this type of system requires tens to hundreds of input/output lines to connect the NC device and the PC, and also requires a driver and a receiver for each signal line.

(Problems to be solved by the invention) Figure 4 shows the NC device a in the conventional numerical control system.
FIG. 3 is a diagram showing the state of connection between the computer and the PC.

The control section of the PC and the input/output circuit section C are path-coupled, and if the corresponding input/output circuit section C is mounted on the machine side, connection to one machine side can be made with one cable. However, NC device a!
: In order to exchange signals with the input/output circuit section C of the PC, N
A large number of receiver circuits are required for wiring between the C device a and the input/output circuit section C of the PC, and for the Drino for signal transmission and reception, which causes many problems in terms of cost, installation space, and workability. there were.

The present invention has been made in view of the above points, and is
The purpose of the present invention is to provide a numerical control system that facilitates wiring between an independently installed PC and an NC device by connecting the devices with a serial transmission line.

Means for Solving Problem C) The numerical control system of the present invention comprises a numerical control device that stores an NC program and performs calculation control of a machine tool to be controlled, and a machine interface side of this numerical control device. A serial transmission circuit, a programmable controller that performs sequence control on multiple mechanical elements of the machine tool, multiple remote input/output units that input and output control signals between this programmable controller and each mechanical element, and these remote comprising an input/output section and a serial transmission line connected to the programmable controller as a data transmission/reception bus common to the serial transmission circuit;
A numerical control device and a remote input/output section are connected to the programmable controller in an equivalent manner.

(Function) Since the numerical control device and the remote input/output unit can be connected to the independently installed programmable controller with a single cable, production equipment can be easily unified.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram of the configuration of a numerical control system showing one embodiment of the present invention.

1 is a numerical control device (NC) that stores an NC program and performs arithmetic control on a machine tool to be controlled; 2 is a programmable controller (PC) that performs sequence control on multiple machine tools or multiple mechanical elements of a machine tool; ), 3
are a plurality of remote input/output units that input and output control signals between this PC 2 and each mechanical element.

The PC 2 is composed of a memory for storing sequence programs, a microprocessor for control, etc., and the feature of the present invention is that the MCI and each remote input/output unit 3 are serially connected to the control unit of the PC 2 in an equivalent relationship. It is connected to the transmission line 4. In other words, the PC 2
N at the same level as the remote input/output unit 3 when viewed from the control unit.
By installing C1, 4 NC devices a and PC, which were previously required in large numbers, can be removed.
The wiring between the input/output circuit section C and the driver and receiver circuits for transmitting and receiving signals are made into LA.

Here, the remote input/output unit 3 constitutes one side of the input/output circuit of the PC 2, and is located away from the PC 2.
A circuit for converting serial signals from a computer or MCI into a signal compatible with connected mechanical elements, and is traditionally used to connect between computers and sequencer input/output devices when they are distributed and distributed. It is used to reduce the number of cables used.

FIG. 2 is a block diagram showing the configuration of the MCI.
is an arithmetic processing circuit, which is connected to a program memory RAM 13 and a data memory RA via a pass line 12.
A ROM 15 that stores software for controlling the MI 4 and other peripheral devices is connected. A register file 16 stores data to be transferred to the PC 2 and data transferred from the PC. This register file 16 can be replaced by RAM and a bus arbiter. Reference numeral 17 denotes a serial transmission circuit constituting the machine interface side of the MCI, and this serial transmission circuit 17 is connected to the PC 2 via a serial transmission line 4, which is a bus for transmitting and receiving data common to the remote input/output section 3. There is.

FIG. 3 is a diagram showing an example of the configuration of the serial transmission circuit 17, in which parallel data on the NCI side is converted to serial data via a serial/parallel conversion circuit 171 and a driver/receiver 172, and the serial transmission line 4.

In the system of the above embodiment configured in this way, when a machine user wants to unify production equipment in a factory and expand the system, he/she can install an independent PC to perform sequence control of multiple machines. This method can be adopted and N
Since only one cable is needed to connect the C and PC, it is not only advantageous in terms of cost, but also saves space in the factory and makes it easier to change the system in the future. It has no superior merits.

It goes without saying that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist of the invention.

(Effect of the invention) As described above, according to the present invention, the a
By connecting the ■ with a serial transmission line, an independently installed P
It is possible to provide a numerical control system that allows easy wiring between C and an NC device.

[Brief explanation of drawings]

FIG. 1 is a configuration explanatory diagram of a numerical control system illustrating an embodiment of the present invention, FIG. 2 is a block diagram illustrating an example of the configuration of an NC device, and FIG. 3 is a diagram illustrating an example of a serial transmission circuit.
FIG. 4 is a diagram showing an example of a conventional system. Engineering: Numerical control device, 2: Program controller, 3: Remote input/output unit, 4: Serial transmission line. Patent applicant: Representative of FANUC Co., Ltd. Patent attorney: Minoru Tsuji 2nd
Figure 3 ゛

Claims (1)

[Claims] A numerical control device that stores an NC program and performs calculation control on a machine tool to be controlled, a serial transmission circuit that constitutes a machine interface side of this numerical control device, and a sequence control for multiple mechanical elements of the machine tool. a programmable controller that performs the operation, a plurality of remote input/output units for inputting and outputting control signals between the programmable controller and each mechanical element, and a bus for transmitting and receiving data common to these remote input/output units and the serial transmission circuit. 1. A numerical control system comprising a serial transmission line connected to a programmable controller, wherein a numerical control device and remote input/output lines are connected in an equivalent relationship to the programmable controller.