JPS59223041A - Monitoring control device - Google Patents

Abstract

PURPOSE:To transfer simultaneously a state variation to a monitoring station by abandoning a sent-out monitoring signal by sending out an interrupting code, when a variation is generated in a state of a monitoring input, and sending out a monitoring signal of a new cycle. CONSTITUTION:A monitoring input signal 1 consisting of plural monitoring items is scanned as to one item each by a scanning circuit 5, and compared with the contents of one cycle before. In case a state variation is detected in the monitoring input signal 1, a detecting signal 7 is sent out to a variation processing circuit 8, an interlock signal 10 is sent from the circuit 8, and sending-out of a monitoring signal 12 is stopped by clearing an encoding circuit 6. At the same time, an interrupting code 9 is sent out from the circuit 8 and sent out to a transmission line by switching a changeover SW14 to the interrupting code 9 from the monitoring signal 12. By this interrupting code 9, the contents of a state variation of a specified item, which is generated in a prescribed time can be transferred simultaneously, and also the varied contents can be transferred more quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cyclic transmission type supervisory control device having a plurality of monitored items constituting a monitored input signal whose status changes occur within a certain period of time. The present invention relates to a monitoring control device that enables state changes of specific items to be transmitted quickly from a monitored station to a monitoring station using monitoring signals in the same cycle.

Conventionally, as shown in FIG. 1, in a monitoring control device for a monitored station that performs cyclic transmission, a monitoring input signal 1 consisting of a plurality of monitoring items is input to a scanning circuit 3 and sequentially scanned, and then sent to an encoding circuit 4. The monitoring signal 2 is input to the encoding circuit 4 at the timing of the termination of the synchronization code of the monitoring signal 2 sent from the monitor signal 2. The input signal is converted to 1 by the encoding circuit 4 as shown in signal 2 in FIG.
After the cycle is generated into a supervisory signal 2 consisting of a synchronization code, data, and a check code, it is sent to the transmission path. Therefore, if the state of the monitoring input signal changes while the data of monitoring signal 2 is being sent to the transmission path, the changed contents are encoded at a timing delayed by a maximum of one cycle (one hour) and the next cycle It becomes the monitoring signal 2 and is sent out to the transmission path.

In other words, if the state of the monitoring input signal 1 changes before and after the timing when the scanned signal is input to the encoding circuit 4, the information will be transmitted to the monitoring station between the item whose state changed before the timing and the item whose state changed after the timing. This results in a difference in time by a time T corresponding to one cycle.

For this reason, the transmission time for one cycle is long, and a system in which the monitoring station automatically performs judgment processing based on the contents of the monitoring signal 2 has the disadvantage of causing malfunction.

When the present invention detects a change in the state of the monitoring input signal, it stops the monitoring signal being sent to the transmission line, and after sending out an interrupt code meaning abandoning the previous cycle's monitoring signal, a new monitoring signal is scanned. By sending a monitoring signal based on an input signal to a transmission path, the above drawbacks are eliminated, and the contents of a specific item whose status changes within a certain period of time can be transmitted as a monitoring signal in the same cycle and quickly transmitted to a monitoring station. The purpose of this invention is to provide a device with

That is, according to the present invention, a change in the supervisory input signal is detected in a supervisory control device that repeatedly scans a supervisory input signal consisting of a plurality of items once in a scanning circuit, encodes it into a supervisory signal, and then cyclically transmits it. means for stopping the monitoring signal by detecting a change in the monitoring input signal and sending an interrupt code to the transmission line for abandoning the monitoring signal; and a monitoring signal for a new monitoring input signal again after sending the interrupt code. Send '! As a result, it is possible to provide an entire supervisory control device capable of transmitting the contents of a specific item whose state changes within a certain period of time using a supervisory signal in the same cycle and transmitting the same quickly.

The present invention will be described in detail below with reference to the drawings.

FIG. 2 is a functional block diagram of an embodiment of the present invention, 1
is a monitoring input signal, 5 is a scanning circuit, 6 is an encoding circuit, 7 is a change detection signal, 8 is a change processing circuit, 9 is an interrupt code%
10 is interlock signal, 11゜12 is monitoring signal%
14 is a switching SW. FIG. 3 shows a procedure for transmitting a supervisory signal according to the embodiment of FIG. This example is shown in FIG.
I will explain. A monitoring input signal 1 consisting of a plurality of monitoring items is input to the scanning circuit 5 and is selectively scanned one by one for 91 items, and then compared with the contents scanned one cycle before. If no state change is detected in the compared result monitoring input signal 1,
The monitoring signal 11 is cyclically sent to the transmission path in the same manner as in the prior art. On the other hand, as a result of the comparison, if a state change is detected in the monitoring input signal 1, a change detection signal 7 is sent from the scanning circuit 5 to the change processing circuit 8, and the interlock signal 10 is sent from the change processing circuit 8 to the encoding circuit 6. Clears the sending υ encoding circuit 6 and outputs the monitoring signal 12 at full pressure. At the same time, the change processing circuit 8 sends out the interrupt code 9, and the switch 5WI4 switches from the monitoring signal 12 to the interrupt code 9 and sends it to the transmission path. As shown in FIG. 3, the monitoring signal 11 sent to the transmission line is sent to the transmission line at the time when the monitoring input signal 1 changes and the change detection signal 7 is generated.
- The supervisory signal 12 of the first cycle is abandoned by the interrupt code 9, and then the newly scanned supervisory input signal 1
The n-th and subsequent monitoring signals are converted into monitoring signals 11 and 12 and sent to the transmission path.

The above-mentioned interrupt code is used for the delay time in order to send the content of the state change of a specific item that occurs within a certain period of time to the monitoring station as a monitoring signal 11°12 of the same cycle as the monitoring item that caused the interrupt code to occur. To prevent malfunctions due to the monitoring station being unable to determine whether the monitoring signal 11 of the n-1st cycle has been abandoned in the relationship between the monitoring signal 11 of the +n-1st cycle and the monitoring signal 11 of the n-th cycle sent subsequently. It is for.

This interrupt code has the effect of being able to simultaneously transmit the contents of the state change of the specific item and also being able to transmit the changed contents more quickly.

As explained above, the present invention provides a supervisory signal transmission method in which when a change occurs in the state of the supervisory input, the supervisory signal that has already been sent to the transmission path is abandoned by sending an interrupt code to the transmission path, and the interrupt signal is By sending the Ksg to the transmission path from the new cycle of the monitoring signal after sending it, there is an advantage that changes in the status of specific items that occur within a certain period of time can be simultaneously transmitted from the monitored station to the monitoring station. .

Further, there is an effect that the contents of the changed monitoring input signal can be transmitted more quickly and without errors.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram according to the prior art, FIG. 2 is a functional block diagram according to one embodiment of the present invention, and FIG. 3 is a functional block diagram according to an embodiment of the present invention.
3 shows a procedure for transmitting a supervisory signal in the illustrated embodiment. In the figure, 1...monitoring input signal, 2...
...Monitoring signal, 3...Scanning circuit, 4...
...Encoding circuit, 5...Scanning circuit, 6...
... Encoding circuit, 7... Change detection signal, 8...
...Change processing circuit, 9...Interrupt code, 1
0...--Interlock signal, 11.12...
...Monitoring signal, 14...Switching SW, 15...
. . . This is the code structure of the monitoring signal for one cycle. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] In a supervisory control device that repeatedly scans an input supervisory input signal, encodes it into a supervisory signal, and then cyclically transmits the same, the supervisory input signal includes a means for detecting a change in the supervisory input signal, and a means for detecting a change in the supervisory input signal. A means for transmitting an interrupt code for abandoning the supervisory signal to a transmission line, and a means for scanning a new supervisory input signal again after transmitting the interrupt code and starting transmitting the generated supervisory signal. A monitoring and control device characterized by comprising: