JPH0323038B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a production control device using a local area network that can promote factory automation and the like.

[Technical background of the invention]

In recent years, FA (Factory Automation) has been called for in order to improve productivity in factories.At the same time as automating machines and equipment, it is important to understand the operating status of the machines and load distribution, as well as the aggregation of production results,
Furthermore, there is a growing demand for a system that can manage individual machine units, including yield analysis.

As one example, highly reliable information transmission systems that can connect microcomputers for machine control and personal computers for production management and quality control to form local area networks at production sites have been proposed. be.

When controlling equipment such as manufacturing machines and processing machines by configuring a local area network, it is desirable to be able to manage the operating status of the machines.

For example, by managing and analyzing the operating time, maintenance time, and down time of equipment, it becomes possible to know the efficiency of the equipment, the timing of maintenance inspections, or the division of work.

[Purpose of the invention]

The purpose of the present invention is to meet such demands, and it is possible to monitor the operating status of devices, especially the on/off status of contacts such as control relays (including the on/off status of non-contact relays, etc.) at a terminal station. This invention provides a production management device that can send data in response to a data transmission request from a certain personal computer.

[Structure of the invention]

The production control device of the present invention uses a local area network consisting of an input terminal device that detects data such as the operating status of equipment, a terminal station that collects the data, and a data bus that connects these. The input terminal device includes a status register that stores the on/off state of the contacts of the operating equipment that operates the equipment, a counter that accumulates the number of on/off times of the contacts, and a first register that accumulates the on-time of the contacts. A second cumulative timer that totals the time the contact is turned off, and an interval timer that measures the interval time from the rising edge of a contact on to the rising edge of the next turning on. data detection means; a non-volatile RAM for storing contact data detected by the contact data detection means at regular intervals; and a transmission control means for determining whether the terminal station is the terminal station and, if the terminal station is the terminal station, transmits the specified data from the nonvolatile RAM to the terminal station via the data bus with the address of the terminal station attached. shall be.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the drawings.

FIG. 1 shows an example of a local area network constructed according to the present invention, in which 1 is a data bus, 2 is a central control station, 3 is a terminal station, 4 is an input terminal, 5-1, 5- 2 is a contact point of the device.

The input terminal 4 includes a status register 6 that stores the on/off state of the contact 5-1, a counter 7 that totals the number of on/off times, and a first cumulative timer 8 that totals the time that the contact is on. a second timer 9 for accumulating the time during which the contact is off;
An input processing circuit 11-1 is provided which includes an interval timer 10 that measures an interval time from the rising edge of a contact to the rising edge of the next turning on. -2 are provided, and similarly there are as many input processing circuits as there are contacts.

These contact information are stored in the nonvolatile RAM 12. Reference numeral 13 denotes a transmission control circuit, which transmits contact information using a method described later.

The terminal station 3 is also equipped with a data collection device 14, which includes a command decoding means 16 for decoding commands from a personal computer 15, a non-volatile
A RAM 17, a receiving nonvolatile RAM 18, and a transmission control circuit 19 are provided.

Next, data processing of the apparatus of this embodiment will be explained.

Contact information of equipment such as machine tools is input to each input terminal, and the data is stored in the non-volatile RAM 1.
2, it is saved in the form of a table at regular intervals, for example every 0.1 seconds, so if you want to know the contact data, specify which contact data of which input terminal device you want using the computer 15. do. The transmission request signal is sent from the transmission control circuit 19 via the data bus 1. In the input terminal 4,
It detects that the address of the request signal is its own, and sends the contact data stored in the nonvolatile RAM to the terminal station 3 with the address that is its own attribute attached. The data is received by the terminal station 3 that issued the data transmission request and input into the personal computer.

Note that a data transmission request can be issued in the same way from a personal computer of another terminal station, and the input terminal that has received the data request will send contact data to the personal computer that has requested the data. Therefore, contact data can be received from any terminal station through the data bus 1.

The contact data thus received is displayed on the CRT screen of the personal computer 15 of the terminal station 3, and is output to an attached printer if necessary.

The personal computer 15 automatically prints out the production numbers and records the line operating status, etc. based on the data from the data counter 7 on the number of times the contact turns on and off.
CRT monitor, data collection such as yield and defect causes,
System management such as machine operation time charts can be performed.

In addition, from the data from the contact operating time first and second cumulative timers and the interval timer, it is possible to know the operating time, maintenance time, and down time of machines and equipment. can be automatically monitored.

〔Effect of the invention〕

As described above, according to the present invention, contact operation signals distributed on the line can be centrally managed in one place, and productivity management, machine operating status, etc. can be aggregated, monitored, or recorded by a personal computer. This has the effect of:

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a local area network constituting a production control apparatus according to the present invention, and FIG. 2 is an explanatory diagram showing a method of transmitting contact data. 1: data bus, 2: central control station, 3: terminal station, 4: input terminal, 5-1, 5-2: contact,
6: Status register, 7: Counter, 8: First cumulative timer, 9: Second cumulative timer, 10: Interval timer, 11-1, 11-2: Input processing circuit, 12: Nonvolatile RAM, 13: Transmission control circuit , 14: Data collection device, 15: Personal computer, 1
6: Command decoding means, 17: Non-volatile for transmission
RAM, 18: Nonvolatile RAM for reception, 19: Transmission control circuit.

Claims (1)

[Claims] 1. Using a local area network consisting of an input terminal device that detects data such as the operating status of equipment, a terminal station that collects the data, and a data bus that connects these. The input terminal device is a production control device, and the input terminal device includes a status register that stores the on/off state of a contact of an operating device that operates the equipment, a counter that accumulates the number of on/off times of the contact, and a first register that accumulates the on-time of the contact. Contact data for each contact, including a cumulative timer, a second cumulative timer that cumulatively totals the time the contact is turned off, and an interval timer that measures the interval time from the rising edge of a contact on to the rising edge of the next turning on. a detection means; a non-volatile RAM for storing contact data detected by the contact data detection means at regular time intervals; and transmission control means for determining the terminal station and transmitting specified contact data with the address of the terminal station from the non-volatile RAM to the terminal station via the data bus if the terminal station is the terminal station. production control equipment.