JPS5918734B2 - Process control data collection and distribution equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a process control method in which several remote sections are provided to obtain or supply data indicating the process status, and the data between the remote sections and the central section is provided. The present invention relates to a data collection and distribution device for exchanging information.

A conventional data collection and distribution device of this type is provided with remote parts R1 to Rn, for example, as shown in FIG. is connected to a data line 11 for transmitting and receiving data, and data is transmitted and received to and from the central section 12 via this data line 11.

A periodic address generator 13 is provided to specify the remote parts R1 to Rn and obtain their data to the central part 12, and the addresses generated by the address generator 13 are transmitted to each remote part R1 to Rn through address lines 14. data from the remote section corresponding to that address is provided to the central section 12 in the manner described above. Alternatively, as shown in FIG. 2, an address is generated in the central section 12 and applied to the address line 14, thereby selecting one of the remote sections R1 to Rn, and transmitting data from the remote section to the central section 12. There were also some that I received.

In the conventional data collection and distribution device shown in FIG. 1, even if the central part requires data for a specific remote part, the periodic address generator 13 generates an address for that remote part. The desired data from the remote part cannot be obtained.

In the data collection and distribution device shown in FIG. 2, the central section 12 can immediately obtain the data it needs from the remote section, but when the data is not needed, no data from the remote section is generated on the data line. For this reason, for example, if it is desired to provide a data eavesdropping section 15 such as a monitor that constantly records data from the remote sections R1 to Rn, the central section 12 must address the remote sections R1 to Rn periodically and sequentially. If this is not done, if there is an eavesdropping unit that is constantly monitoring as described above, the supply of data to it will also be stopped. The central section 12 is, for example, a main control room for performing measurements, and the eavesdropping section 15 that eavesdrops on the data is a sub-monitor panel or the like that monitors the data. From this point of view, the present invention provides a process data collection and distribution device that is capable of not only periodically exchanging data, but also exchanging data with a specific remote unit as needed.

According to this invention, addresses are periodically generated to transmit and receive data between the remote part and the central part, and the central part generates addresses to any remote part as necessary. In this case, when interrupting the data, the supply of the periodic address to the address bus is stopped. In this way, the eavesdropping section can constantly and periodically obtain information, and moreover, the central section can send and receive data to and from a specific remote section in the event of an emergency. For example, as shown in FIG. 3 in which parts corresponding to those in FIGS. Addresses for Rn are generated periodically and sequentially, and the addresses for the remote part R
, -Rn and the central portion 12 are sequentially transmitted and received.

At the same time, an interrupt line 16 is connected between the central part 12 and the periodic address generator 13, which enables the central part 12 to also generate addresses for the remote parts R1 to Rn, and when the address is generated, an interrupt line 16 is connected. line 1
6, and this interrupt signal inhibits the address of the address generator 13 from being supplied to the address line 14. For this purpose, for example, the address from the address generator 13 may be supplied to the address line 14 through an inhibit gate, and the inhibit signal for the inhibit gate may be provided by an interrupt signal from the interrupt line 16. According to this configuration, the periodic address generator 13 periodically generates address addresses to the remote sections R1 to Rn in sequence, and data exchange between the central section 12 is performed. Therefore, the eavesdropping section 15 can always obtain data from the remote section at regular intervals, so that, for example, correct recording can be performed. By the way, when the central section 12 wants data for a specific remote section, by sending that address from the central section 12 to the remote section through the address line 14, data can be sent and received between the corresponding remote section and the central section. In this case, since the supply of addresses from the address generator 13 via the interrupt line 16 is stopped, the address specification from the address generator 13 and the address specification from the central section 12 overlap, resulting in incorrect address specification. There's no fear.
Since addresses can be generated in the central unit 12 when necessary, there is no need to wait for the address generator 13 to generate an address for the corresponding remote unit in an emergency as shown in FIG. It becomes possible to send and receive data. When the address is generated from the central part 12, the supply of the address from the address generator 13 is stopped, and therefore no data is sent from the remote part to which the address from the address generator 13 should be given at that time, and this data is For example, the eavesdropping unit 15 does not record the data, but even if the periodically recorded data is missed once, there is no risk of greatly affecting the analysis of the data.
In this way, the data collection and distribution device of the present invention is shown in FIGS. 1 and 2.
The features of both of the conventional devices shown in the figure can be easily obtained by simply providing an interrupt line.

[Brief explanation of drawings]

1 and 2 are block diagrams showing an example of a conventional process data collection and distribution device, respectively, and FIG. 3 is a block diagram showing an example of a process control data collection and distribution device according to the present invention. R1-R2: Remote part, 11: Data line, 12:
Central part, 13: Periodic address generator, 14: Address line, 15: Eavesdropping part, 16: Interrupt line.

Claims (1)

[Claims] 1 at least one remote section, a central section that generates an address for the remote section and supplies it to an address bus to send data on a data line, and an address line that connects the remote section and the central section; a data line, a periodic address generator that periodically sends the address of the remote section to the address line, an interrupt line other than the address line that connects the periodic address generator and the center section, and an interrupt line other than the address line that connects the periodic address generator and the center section; means for inhibiting the supply of an address from the periodic address generator to the address line by driving the interrupt line from the central part when the part supplies an address to the address bus, and connected to the data line; and a wiretapping section that incorporates data on the data line and constantly monitors the remote section.