JPS58104535A - Transmission system with priority - Google Patents

Abstract

PURPOSE:To precess a failure signal of slave stations surely without providing a vacant line time, by preventing crosstalk with the polling system performing a call repetitively at a prescribed interval from a master to the slave stations. CONSTITUTION:A failure produced in a station to be monitord (slave station) is transmsitted to a monitoring station (master station) with priority by using the polling system by means of a radio wave. In this case, the master station has a radio device 1 having a transmitter TX and a receiver RX, and a call controlling section 2 can perform a call at a prescribed interval to the slave stations other than a prescribed time or an arbitrary call, and a failure signal inputted via the RX is detected at a failure dicriminator 3. On the other hand, the slave stations have a radio device 4 provided with a transmisser TX and a receiver RX. In detecting a failure signal inputted from an input section 5, a failure memory 6 storing the failure signal is set and the signal is transmitted to the master station as the status signal from an input device 7.

Description

[Detailed Description of the Invention] The present invention relates to a single radio wave polling method, and in particular to a priority transmission method for transmitting abnormalities occurring in a monitored station to a monitoring station with priority. is.

Conventionally, using this kindless @ 1 wave polling method, in order to transmit an abnormality that occurs on the monitored station (hereinafter referred to as slave station) side to the monitoring station (hereinafter referred to as master station), the slave station must Either the abnormality information is stored and transmitted to the master station at the next polling cycle, or an idle time is provided so that the slave station transmits the abnormality activation signal multiple times even during polling, and during the idle time Those that are received at least once by the master station,
Alternatively, in preparation for interference, a system was adopted in which transmission was repeated from the slave station at regular intervals until a reset signal was received from the master station.

Figure 1- is a time chart explaining the case where there is idle time, and shows the time interval between the calling time from the master station (T) and the response time from the slave station (T2), T+T, and the next time interval. An idle time T51 (see FIG. 1(a)) is provided between T□+T, and from the slave station, for example, as shown in FIG. 1(b).
As shown in s(C), an abnormal signal is transmitted five times at a predetermined interval T4 at an abnormal value activation time T, and is received by the master station once. In addition, (b
) is the acceptable limit for the first activation, (b) to t
o> indicates the acceptance range for the third activation.

However, in the conventional polling method using one 2M radio wave, when there is an abnormal value activation, the number of transmission items per station is large, and in a system with a large number of stations, the above-mentioned 6 idle time There are disadvantages such as proportionally more data, longer data collection time, and remote control makes adjustment control difficult.

The present invention was developed in order to eliminate the drawbacks of the conventional method as described above, and provides a priority transmission method that can detect abnormalities in slave stations more quickly without idle time or interference. It provides:

Hereinafter, the priority transmission method of the present invention that does not have idle time will be explained. In the present invention, when a slave station detects an abnormal signal, it sets an abnormal memory and transmits it as a status signal to the master station, On the other hand, the master station is configured to repeatedly call the target slave station at regular intervals to detect an abnormal signal at regular time t7t even at times other than when making arbitrary calls.

That is, FIG. 3 shows an embodiment for realizing the priority transmission system of the present invention, in which (1) is a master station wireless device comprising a transmitter (TI) and a receiver (RX), and a call control unit (2) The receiver (RX
The abnormality signal input via J is configured to be detected by an abnormality discriminator (8).

Moreover, (4) is a slave station equipped with a transmitter (TX) and a receiver (RX) like the above-mentioned master station. When the first alarm detects an abnormal signal input from the input unit (6), it sets the abnormal memory (6) that stores the abnormal signal and outputs the abnormal signal from the input unit (7).
) is configured to be transmitted to the master station as a status signal. Note that this slave station does not perform automatic oscillation such as abnormal value activation. However, the abnormality memory (6) is reset when the abnormality signal returns.

Therefore, according to the present invention, a polling method is adopted in which the master station repeatedly calls the slave station at regular intervals even when the master station is not making regular or arbitrary calls. Abnormal signals from slave stations can be reliably processed without the need for such equipment.

[Brief explanation of drawings]

Figure 1 is a time chart explaining the conventional polling method, where (!L) is the time interval T, +T, and the idle time T8.
(b) and (0) each show an example of n abnormal signal transmission. Further, FIG. 2 shows the components for implementing the priority transmission method of the present invention. T: Calling time T: Response time T: Abnormal value activation time T4 = Abnormal value activation interval T: Blank line time (
1), (4): No equipment (2): Call control unit (3
): Abnormality discriminator (5): Input section (6): Abnormal memory (7): Input device agent Shin Kuzuno - 1i\ 114 Ward U Ward 11 ■: 1 2nd 1A

Claims (1)

[Claims] In the priority transmission method that uses the polling method using 1fi to preferentially transmit abnormalities that occur on the monitored station side to the monitoring station, when an abnormal signal is detected, the abnormality memory is set and the status of the monitored station is set. The above-mentioned monitoring station is configured so as to be transmitted as a signal to a monitoring station, and on the other hand, the monitoring station is configured to repeatedly call the target monitored station at regular intervals to detect abnormal signals even when not making short poems or arbitrary calls. Features a priority transmission method.